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Spin state crossover in Co3BO5 / N. V. Kazak, M. S. Platunov, Y. V. Knyazev [et al.] // Phys. Rev. B. - 2021. - Vol. 103, Is. 9. - Ст. 094445, DOI 10.1103/PhysRevB.103.094445. - Cited References: 71. - We acknowledge many inspirational discussions on the topic of this paper with the late Natalia Ivanova and Leonard Bezmaternykh. The authors acknowledge A. Ney for allowing us to use the XANES spectrum of film. We are grateful to the Russian Foundation for Basic Research (Project No. 20-02-00559) and President Council on Grants (Project No. МК-2339.2020.2) for supporting this paper. This paper was carried out within the state assignment of the Russian Ministry of Science and High Education via program “Quantum”' (No. AAAA-A18-118020190095-4). We also acknowledge support by Russian Ministry of Education and Science via Contract No. 02.A03.21.0006. We acknowledge financial support from the Spanish Ministry of Economy, Industry and Competitiveness (MINECO, Grant No. MAT2017-83468-R) and from the regional Government of Aragon (E12-20R RASMIA project) . - ISSN 2469-9950
Кл.слова (ненормированные):
Carbon dioxide -- Crystal structure -- Dichroism -- Energy gap -- Hydraulic structures -- Ions -- Iron compounds -- Magnetic moments -- Magnetic susceptibility -- Single crystals -- DC magnetic susceptibility -- Effective magnetic moments -- Electronic configuration -- Generalized gradient approximations -- Magnetic sublattices -- Octahedral environment -- Paramagnetic susceptibility -- X-ray magnetic circular dichroism -- Cobalt
Аннотация: We have investigated the spin and oxidation states of Co in Co3BO5 using x-ray magnetic circular dichroism (XMCD) and dc magnetic susceptibility measurements. At low temperatures, XMCD experiments have been performed at the Co K-edge in Co3BO5 and Co2FeBO5 single crystals in the fully ferrimagnetically ordered phase. The Co (K-edge) XMCD signal is found to be related to the Co2+ magnetic sublattices in both compounds, providing strong experimental support for the low-spin (LS) Co3+ scenario. The paramagnetic susceptibility is highly anisotropic. An estimation of the effective magnetic moment in the temperature range 100–250 K correlates well with two Co2+ ions in the high-spin (HS) state and some orbital contribution, while Co3+ remains in the LS state. The crystal structure of the Co3BO5 single crystal has been solved in detail at the T range 296–703 K. The unit cell parameters and volume show anomalies at 500 and 700 K. The octahedral environment of the Co4 site strongly changes with heating. The generalized gradient approximation with Hubbard U correction calculations have revealed that, at low-temperatures, the system is insulating with a band gap of 1.4 eV, and the Co2+ ions are in the HS state, while Co3+ are in the LS state. At high temperatures (T > 700 K), the charge ordering disappears, and the system becomes metallic with all Co ions in 3d7 electronic configuration and HS state.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
M.N. Miheev Institute of Metal Physics UB RAS, Ekaterinburg, 620137, Russian Federation
Ural Federal University, Ekaterinburg, 620002, Russian Federation
Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza, Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Zaragoza, 50009, Spain
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
P.N. Lebedev Physical Institute of RAS, Moscow, 119991, Russian Federation
ESRF-The European Synchrotron, 71 Avenue des Martyrs CS40220, Grenoble Cedex 9, F-38043, France

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Gorev, M. V.; Горев, Михаил Васильевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Pchelkina, Z. V.; Gapontsev, V. V.; Streltsov, S. V.; Bartolome, J.; Arauzo, A.; Yumashev, V. V.; Gavrilkin, S. Y.; Wilhelm, F.; Rogalev, A.
}
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Allotropic modifications of cobalt upon chemical deposition / A. V. Chzhan, S. A. Podorozhnyak, V. K. Mal’tsev [et al.] // Phys. Solid State. - 2021. - Vol. 63, Is. 1. - P. 42-46, DOI 10.1134/S1063783421010054. - Cited References: 17. - This study was supported in part by the Russian Foundation for Basic Research, project no. 18-02-00161-a . - ISSN 1063-7834
Кл.слова (ненормированные):
Co–P thin magnetic films -- chemical deposition -- nuclear magnetic resonance -- allotropic modifications of Co
Аннотация: The effect of the solution acidity on the crystal structure of cobalt during its chemical deposition is reported. It has been shown using the structural and magnetic examination and nuclear magnetic resonance study that the change in the working solution acidity leads to deposition of cobalt with different allotropic modifications in the nearest environment: the hcp type in the small (up to ~8.5) pH region and the fcc type in the large (over ~8.5) pH region. The formation of these cobalt modifications is attributed to the size effects caused by a decrease in the particle size with increasing pH.

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Публикация на русском языке Аллотропные модификации кобальта при химическом осаждении [Текст] / А. В. Чжан, С. А. Подорожняк, В. К. Мальцев [и др.] // Физ. тверд. тела. - 2021. - Т. 63 Вып. 1. - С. 43-47

Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Chzhan, A. V.; Podorozhnyak, S. A.; Mal'tsev, V. K.; Мальцев, Вадим Константинович; Krayukhin, I. N.; Patrin, G. S.; Патрин, Геннадий Семёнович
}
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    Hybrid nanoparticles based on cobalt ferrite and gold: Preparation and characterization / S. Saikova, A. Pavlikov, T. Trofimova [et al.] // Metals. - 2021. - Vol. 11, Is. 5. - Ст. 705, DOI 10.3390/met11050705. - Cited References: 74 . - ISSN 2075-4701
   Перевод заглавия: Гибридные наночастицы, основанные на феррите кобальта и золоте: получение и ислледование
Кл.слова (ненормированные):
CoFe2O4/Au nanoparticles -- Toxicity -- X-ray photoelectron spectroscopy -- Anion-exchange resin precipitation -- Hybrid nanoparticles -- Synthesis -- Magnetic hysteresis loops
Аннотация: During the past few decades, hybrid nanoparticles (HNPs) based on a magnetic material and gold have attracted interest for applications in catalysis, diagnostics and nanomedicine. In this paper, magnetic CoFe2O4/Au HNPs with an average particle size of 20 nm, decorated with 2 nm gold clusters, were prepared using methionine as a reducer and an anchor between CoFe2O4 and gold. The methionine was used to grow the Au clusters to a solid gold shell (up to 10 gold deposition cycles). The obtained nanoparticles (NPs) were studied by X-Ray diffraction (XRD), transmis-sion electron microscopy (TEM), Fourier-transform infrared (FT-IR) spectroscopy, X-Ray photoelectron spectroscopy (XPS) and UV-vis spectroscopy techniques. The TEM images of the obtained HNPs showed that the surface of cobalt ferrite was covered with gold nanoclusters, the size of which slightly increased with an increase in the number of gold deposition cycles (from 2.12 ± 0.15 nm after 1 cycle to 2.46 ± 0.13 nm after 10 cycles). The density of the Au clusters on the cobalt ferrite surface insignificantly decreased during repeated stages of gold deposition: 21.4 ± 2.7 Au NPs/CoFe2O4 NP after 1 cycle, 19.0 ± 1.2 after 6 cycles and 18.0 ± 1.4 after 10 cycles. The magnetic measurements showed that the obtained HNPs possessed typical ferrimagnetic behavior, which corresponds to that of CoFe2O4 nanoparticles. The toxicity evaluation of the synthesized HNPs on Chlorella vulgaris indicated that they can be applied to biomedical applications such as magnetic hyperthermia, photothermal therapy, drug delivery, bioimaging and biosensing.

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Держатели документа:
School of Non-Ferrous Metals and Material Science, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation
Institute of Agroecological Technologies, Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, Akademgorodok, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Saikova, S.; Pavlikov, A.; Trofimova, T.; Mikhlin, Y.; Karpov, D.; Asanova, A.; Grigoriev, Y.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Samoilo, A.; Zharkov, S. M.; Жарков, Сергей Михайлович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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    Heterostructures based on Pd–Au nanoparticles and cobalt phthalocyanine for hydrogen chemiresistive sensors / N. S. Nikolaeva, D. D. Klyamer, S. M. Zharkov [et al.] // Int. J. Hydrogen Energy. - 2021. - Vol. 46. Is. 37. - P. 19682-19692, DOI 10.1016/j.ijhydene.2021.03.082. - Cited References: 74. - The work on the synthesis of Au MOCVD precursor and deposition of gold nanoparticles on various surfaces were funded by Russian Science Foundation (RSF) (research project № 20-15-00222 ). The TEM and electron diffraction investigations were conducted in the SFU Joint Scientific Center supported by the State assignment ( #FSRZ-2020-0011 ) of the Ministry of Science and Higher Education of the Russian Federation . - ISSN 0360-3199
   Перевод заглавия: Гетероструктуры, основанные на наночастицах Pd-Au и фтолоцианине кобальта, для хемирезисторных сенсоров водорода
Кл.слова (ненормированные):
Palladium nanoparticles -- Gold nanoparticles -- Bimetallic nanoparticles -- Metal phthalocyanine -- Chemiresistive sensors -- Hydrogen
Аннотация: In this work, the effect of Pd, Au and PdAu nanoparticles on sensor response of cobalt phthalocyanine films to hydrogen was studied. For this purpose, novel heterostructures based on cobalt phthalocyanine and PdAu nanoalloys were obtained by a combination of vacuum thermal evaporation and pulsed metalorganic chemical vapor deposition (MOCVD) and investigated as active layers for hydrogen detection. The structural features and phase composition of the prepared heterostructures were studied by the techniques of X-ray diffraction, transmission electron microscopy and electron diffraction. The concentration of metal nanoparticles in the samples was determined by inductively coupled plasma atomic emission spectroscopy (ICP-AES). The chemiresistive sensor response of CoPc/M (M = Pd, Au, Pd0.2Au0.8 and Pd0.8Au0.2) to hydrogen (100–400 ppm, room temperature) was compared with that of bare CoPc films. It was shown that the sensor response of the investigated heterostructures to hydrogen (300 ppm) increased in the order CoPc (0.2%) < CoPc/Pd0.2Au0.8 (1.9%) ~ CoPc/Au (2.2%) < CoPc/Pd (2.7%) < CoPc/Pd0.8Au0.2 (5.6%).

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Держатели документа:
Nikolaev Institutes of Inorganic Chemistry SB RAS, Lavrentiev Pr. 3, Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Nikolaeva, N. S.; Klyamer, D. D.; Zharkov, S. M.; Жарков, Сергей Михайлович; Tsygankova, A. R.; Sukhikh, A. S.; Morozova, N. B.; Basova, T. V.
}
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Soft magnetic FeCo films produced by green chemistry technique / E. A. Denisova, L. A. Chekanova, I. V. Nemtsev [et al.] // J. Phys.: Conf. Ser. - 2020. - Vol. 1582, Is. 1. - Ст. 012077DOI 10.1088/1742-6596/1582/1/012077. - Cited References: 10. - This work was funded by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 18-42-240006 Nanomaterials with magnetic properties determined by the topological features of the nanostructure). The authors thank the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS for the provided equipment
Кл.слова (ненормированные):
Binary alloys -- Cobalt alloys -- Coercive force -- Deposition -- Industrial research -- Magnetic anisotropy -- Morphology -- Reducing agents -- Surface morphology
Аннотация: The saturation magnetizations, local magnetic anisotropy field and coercivity values of FeCo film plated under various processing conditions have been investigated to optimize soft magnetic properties. Herein, we introduce a very promising processing technique based on the electrodeless deposition of FeCo film with carbohydrates as reducing agents. The produced FeCo film demonstrated significantly better saturation magnetization values and less contaminations, compared to those for the sample preparing with conventional reducing agent (sodium hypophosphite). The surface morphology and coercivities of FeCo films are dependent on the iron content and type of reducing agent. The coercive force values range from 12 up to 30 Oe and the saturation magnetization from 150 to 240 emu/g depending on the bath composition and deposition parameters. Maximum of saturation magnetization magnitude is reached for FeCo film with 30% cobalt. The local anisotropy field value of FeCo alloys increases with a decrease in Fe content for all reducing agent types.

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Держатели документа:
Kirensky Institute of Physics, Sb Russian Academy of Sciences, 50/38, Akademgorodok str., Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 79 Svobodny ave., Krasnoyarsk, 660041, Russian Federation
Scientific Center, Federal Research Center Ksc Sb Ras, 50 Akademgorodok str., Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, 31 Krasnoyarsky Rabochy ave., Krasnoyarsk, 660037, Russian Federation

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Chekanova, L. A.; Чеканова, Лидия Александровна; Nemtsev, I. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Shepeta, N. A.; International Conference on High-Tech and Innovations in Research and Manufacturing(28 February 2020 ; Krasnoyarsk, Russian Federation)
}
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Microstructure and magnetic properties of Co58Ni10Fe5B16Si11 and Co58Ni10Fe5B16Si11-Al2O3 bulk amorphous coatings prepared by plasma spraying / E. A. Denisova, I. V. Nemtsev, S. V. Telegin [et al.] // J. Phys.: Conf. Ser. - 2020. - Vol. 1582, Is. 1. - Ст. 012078DOI 10.1088/1742-6596/1582/1/012078. - Cited References: 18. - This work was funded by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 18-42-240006 Nanomaterials with magnetic properties determined by the topological features of the nanostructure). The authors thank the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” for the provided equipment
Кл.слова (ненормированные):
Alumina -- Aluminum oxide -- Cobalt alloys -- Composite coatings -- Deposits -- Glass -- Heat treatment -- Industrial research -- Iron alloys -- Magnetic properties -- Magnetism -- Microstructure -- Nanocrystalline materials -- Nanocrystals -- Plasma jets -- Plasma spraying -- Silicon -- Silicon alloys
Аннотация: The bulk soft magnetic glassy Co58Ni10Fe5B16Si11 alloy specimens have been prepared by plasma spray deposition. In order to increase resistivity of the material, the bulk Co58Ni10Fe5B16Si11-Al2O3 composite materials were fabricated. The investigations of structure and magnetic properties of the bulk samples were carried out by X-ray diffraction, electron microscopy and magnetic measurements. The relation of the structural features and magnetic characteristics of the bulk coating to the main parameters of the deposition regimes was determined. Optimized plasma spray deposition parameters allowed obtaining bulk glassy samples with magnetic parameters that are not inferior to the characteristics of a thermally treated rapidly quenched ribbon with the same composition. It was found that the bulk amorphous coatings can be characterized as a heterophase system. The relaxation annealing of the Co58Ni10Fe5B16Si11 bulk coating leads to a phase transition in this alloy in the precrystallization temperature range. The magnetic properties of the both kinds of coatings are correlated with changes in the microstructure. The appearance of nanocrystalline phase with TC640 K during relaxation heat treatment leads to a decrease of the coercivity and to an increase of the permeability. A comparison between the magnetic properties of the CoNiFe-BSi coating and (CoNiFe-BSi)-Al2O3, composite coating is carried out.

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Держатели документа:
Kirensky Institute of Physics, Sb Russian Academy of Sciences, 50/38, Akademgorodok str., Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, 73 Svobodny ave., Krasnoyarsk, 660041, Russian Federation
Scientific Center, Federal Research Center Ksc Sb Ras, 50 Akademgorodok str., Krasnoyarsk, 660036, Russian Federation
Reshetnev Siberian State University of Science and Technology, 31 Krasnoyarsky Rabochy ave., Krasnoyarsk, 660037, Russian Federation
Krasnoyarsk Institute of Railways Transport, Novaja Zarja str., Krasnoyarsk, Russian Federation

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Nemtsev, I. V.; Telegin, S. V.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Kuzovnikova, L. A.; Shepeta, N. A.; International Conference on High-Tech and Innovations in Research and Manufacturing(2020 ; 28 Feb. ; Krasnoyarsk)
}
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The Sr2.4Dy0.6Co2O7-δ Ruddlesden‒Popper Phase: Structural, thermoelectric, and magnetic properties / V. A. Dudnikov, Y. S. Orlov, L. A. Solovyov [et al.] // Ceram. Int. - 2021. - Vol. 47, Is. 7, Part A. - P. 9068-9074, DOI 10.1016/j.ceramint.2020.12.030. - Cited References: 39. - The study was supported by the Russian Foundation for Basic Research , project no. 19-03-00017 and the budget project #АААА-А17-117021310222-4 for the Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences . - ISSN 0272-8842
Кл.слова (ненормированные):
Rare-earth substituted cobalt oxides -- Ruddlesden-Popper phase -- Thermoelectric oxide materials -- Magnetic properties
Аннотация: A new anion-deficient Sr2.4Dy0.6Co2O7‒δ (δ = 0.33–1.1) perovskite phase with a structure of the A3B2O7 Raddlesden‒Popper homologous series has been obtained by the solid-state synthesis in the reducing/oxidizing atmosphere and its structural characterization has been performed by the Rietveld refinement of the X-ray powder diffraction data. It has been stablished that the Sr2.4Dy0.6Co2O7‒δ compound (sp. gr. I4/mmm) has parameters of a = b = 3.8526(1) and c = 19.9431(7) Å in the reduced form (δ = 1.1) and a = b = 3.8086(1) and c = 19.9190(6) Å in the oxidized form (δ ≈ 0.33) and oxygen vacancies occupy mainly the sites linking CoO5 polyhedra inside two perovskite layers. It has been established using differential scanning calorimetry and thermogravimetry that, at T < 530 K, the synthesized phase is stable against the inert and oxidizing atmosphere; at higher temperatures, the Sr2.4Dy0.6Co2O7-δ compound can reversibly absorb/release oxygen. The magnetic properties of the Sr2.4Dy0.6Co2O6.09 compound have been investigated in the temperature range of 10–400 K and described in terms of the formation of dimers, in which the Co3+‒Co3+ and Co2+‒Co2+ ion pairs antiferromagnetically interact and are in the nonmagnetic ground state. The electrical conductivity and the Seebeck coefficient have been measured in air in the temperature range from 300 to 800 K. An observed sharp decrease in the Seebeck coefficient of the Sr2.4Dy0.6Co2O7-δ compound and the change in its sign near 700 K have been attributed to the transition of cobalt ions to the Co3+ state and the charge disproportionation of Co3+ ions to Co2+ and Co4+ ones.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry and Chemical Technology, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russian Federation

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Solovyov, L. A.; Vereshchagin, S. N.; Gavrilkin, S. Y.
}
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Contribution of the multiplicity fluctuation in the temperature dependence of phonon spectra of rare-earth cobaltites / Y. S. Orlov, A. E. Sokolov, V. A. Dudnikov [et al.] // Molecules. - 2020. - Vol. 25, Is. 18. - Ст. 4316, DOI 10.3390/molecules25184316. - Cited References: 34. - This work was supported by the Russian Science Foundation grant 18-02-00022. The scanning electron microscopy investigations were conducted in the SFU Joint Scientific Center, supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation. The other research was carried out at the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 1420-3049
Кл.слова (ненормированные):
Rare-earth cobalt oxides -- Multiplicity fluctuations -- Phonon spectra
Аннотация: We have studied, both experimentally and theoretically, the unusual temperature dependence of the phonon spectra in NdCoO3, SmCoO3 and GdCoO3, where the Co3+ ion is in the low-spin (LS) ground state, and at the finite temperature, the high-spin (HS) term has a nonzero concentration nHS due to multiplicity fluctuations. We measured the absorption spectra in polycrystalline and nanostructured samples in the temperature range 3–550 K and found a quite strong breathing mode softening that cannot be explained by standard lattice anharmonicity. We showed that the anharmonicity in the electron–phonon interaction is responsible for this red shift proportional to the nHS concentration.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Shulga, K. V.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Shestakov, N. P.; Шестаков, Николай Петрович; Vysotin, M. A.; Высотин, Максим Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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Dynamic remagnetisation of CoFe2O4 nanoparticles: thermal fluctuational thawing of anisotropy / D. A. Balaev, I. S. Poperechny, A. A. Krasikov [et al.] // J. Phys. D. - 2021. - Vol. 54, Is. 27. - Ст. 275003, DOI 10.1088/1361-6463/abf371. - Cited References: 63. - Experimental measurements were supported by Project No. AAAA-A17-117103050081-1. I S P and Yu L R acknowledge the support of ICMM in the framework of topical task AAAAA20-120020690030-5. The numerical calculations were performed on the Uran supercomputer (Ural Branch, Russian Academy of Sciences, Ekaterinburg) . - ISSN 0022-3727. - ISSN 1361-6463

РУБ Physics, Applied
Рубрики:
COBALT-FERRITE NANOPARTICLES
   MAGNETIC-PROPERTIES
   SIZE
   COERCIVITY
Кл.слова (ненормированные):
nanoparticles -- cobalt ferrite -- magnetodynamics -- superparamagnetism -- effective anisotropy
Аннотация: We report a study of the magnetodynamics of cobalt ferrite (CoFe2O4) nanoparticles with an average diameter of ~6 nm. Hysteresis loops were measured under quasi-static conditions and in pulse fields with amplitudes H0 of up to 130 kOe and for durations τP of 8 and 16 ms. The growth of coercivity Hc observed with an increase in the magnetic field variation rate dH/dt (determined by the values of H0 and τP) and the reduction of Hc with temperature is ascribed to the superparamagnetic effect. The proposed theoretical model explains the observed dependences fairly well. Notably, the effective magnetic anisotropy constant obtained exceeds the value for bulk crystals and might be indicative of the contribution of surface magnetic anisotropy.

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Держатели документа:
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660000, Russia.
Russian Acad Sci, Inst Continuous Media Mech, Ural Branch, Perm 614068, Russia.
Perm State Natl Res Univ, Dept Phase Transit Phys, Perm 614990, Russia.
Russian Acad Sci, Boreskov Inst Catalysis, Siberian Branch, Novosibirsk 630090, Russia.

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Poperechny, I. S.; Krasikov, A. A.; Красиков, Александр Александрович; Semenov, S. V.; Семёнов, Сергей Васильевич; Popkov, S. I.; Попков, Сергей Иванович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Kirillov, V. L.; Yakushkin, S. S.; Martyanov, O. N.; Raikher, Y. L.; [AAAA-A17-117103050081-1]; [AAAAA20-120020690030-5]
}
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10.

Temperature- and field-induced magnetic transitions in the cobalt-containing borates / N. V. Kazak, N. A. Bel’skaya, Yu. V. Knyazev [et al.] // International conference "Functional materials" : book of abstracts / ed. V. N. Berzhansky ; org. com. S. G. Ovchinnikov [et al.]. - Simferopol, 2021. - P. 31. - Библиогр.: 5 назв. - This work has been financed by the Russian Foundation for Basic Research (project no.20-02-00559).

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Доп.точки доступа:
Berzhansky, V. N. \ed.\; Бержанский, Владимир Наумович; Ovchinnikov, S. G. \org. com.\; Овчинников, Сергей Геннадьевич; Kazak, N. V.; Казак, Наталья Валерьевна; Bel’skaya, N. A.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Yumashev, V. V.; Gavrilkin, S. Yu.; Ovchinnikov, S. G.; "Functional materials", International conference(2021 ; Oct. 4-8 ; Alushta, Russia); Крымский федеральный университет имени В.И. Вернадского
}
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11.

    Core-shell and Bi-segmented cobalt-nickel nanorods prepared by electroless deposition / E. A. Denisova, L. A. Chekanova, S. V. Komogortsev [et al.] // IEEE International Magnetics Virtual Conference (INTERMAG'21) : Digest book. - 2021. - P. 1342. - Cited References: 2. - This work was funded by the RFBR, the Government of the Krasnoyarsk Territory, the KRFS (project no. 20-43-240003)
   Перевод заглавия: Бисегментированные и ядро-оболочка наностержни Co-Ni , полученные методом химического осаждения

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Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Chekanova, L. A.; Чеканова, Лидия Александровна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Rautskii, M. V.; Рауцкий, Михаил Владимирович; Nemtsev, I. V.; Немцев, Иван Васильевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Tkachev, V. V.; Plotnikov, V. S.; Dolgopolova, M. V.; IEEE International Magnetics Conference(2021 ; Apr. 26-30 ; Lion, France (Virtual))
}
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12.

The induced anisotropy and its influence on absorption of the NMR and domain structure of Co-P amorphous films / A. V. Chzhan [et al.] // Solid State Phenomena. - 2011. - Vol. 168-169. - P. 145-148, DOI 10.4028/www.scientific.net/SSP.168-169.145 . - ISSN 1012-0394
Кл.слова (ненормированные):
amorphous magnetic films -- coercive force -- domain structure -- induced anisotropy -- nuclear magnetic resonance -- amorphous films -- cobalt -- coercive force -- crystals -- magnetic anisotropy -- magnetic devices -- magnetic domains -- magnetic films -- metallic films -- palladium -- resonance -- amorphous films -- anisotropy -- cobalt -- coercive force -- magnetic anisotropy -- magnetism -- palladium -- amorphous magnetic films -- domain structure -- experimental research -- induced anisotropy -- intermediate layers -- magnetization process -- co-p films -- nuclear magnetic resonance(nmr) -- nuclear magnetic resonance -- nuclear magnetic resonance
Аннотация: The results of experimental research into magnetic properties of amorphous Co-P films obtained by chemical sedimentation on various intermediate layers have been represented. The nuclear magnetic resonance (NMR) spectra of films sedimentated on intermediate layers of Pd crystal and amorphous NiP compound have been measured .The features of formation of domain structures and magnetization processes in the presence and absence of the induced anisotropy have been described.

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Держатели документа:
Kirenskii Institute of Physics, Siberian Branch of RAS, 660036, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Chzhan, A.V.; Patrin, G. S.; Патрин, Геннадий Семёнович; Kiparisov, S. Ya.; Кипарисов, Семен Яковлевич; Seredkin, V. A.; Середкин, Виталий Александрович; Maltsev, V. K.; Мальцев, Вадим Константинович; Krayukhin, I. N.; Краюхин, Иван Николаевич; Euro-Asian Symposium "Trends in MAGnetism"(4 ; 2010 ; Jun.-Jul. ; Ekaterinburg); "Trends in MAGnetism", Euro-Asian Symposium(4 ; 2010 ; Jun.-Jul. ; Ekaterinburg)
}
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13.

    Magnetic and magneto-optical properties of Co-P films prepared by chemical deposition / A. V. Chzhan [et al.] // J. Magn. Magn. Mater. - 2011. - Vol. 323, Is. 20. - P. 2493-2496, DOI 10.1016/j.jmmm.2011.05.024. - Cited Reference Count: 22. - Гранты: This study was supported by the Russian Foundation for Basic Research, Project no. 08-02-00397a and the departmental target program Development of Scientific Potential of Higher Education, 2009-2010, Project no. 2.1.1./4399. - Финансирующая организация: Russian Foundation for Basic Research [08-02-00397a]; departmental target program Development of Scientific Potential of Higher Education [2.1.1./4399] . - OCT. - ISSN 0304-8853
Рубрики:
SPECTROSCOPY
   THICKNESS
   COBALT
Кл.слова (ненормированные):
co-p films -- chemically deposition -- the polar kerr and faraday effects -- hysteresis loops -- chemically deposition -- cop films -- hysteresis loops -- the polar kerr and faraday effects -- chemical deposition -- chemically deposition -- co films -- cop films -- film magnetization -- film surface morphology -- incident light -- magnetic and magneto-optical properties -- magnetic layers -- polar kerr effect -- polar-kerr -- polycrystalline -- underlayers -- chemical analysis -- faraday effect -- hysteresis loops -- kerr magnetooptical effect -- light reflection -- magnetic materials -- optical kerr effect -- palladium -- cobalt
Аннотация: Features in the formation of chemically deposited polycrystalline Co-P films with thicknesses of a few nanometers are established by analyzing film surface morphology and variation in the film magnetization. It is shown that in the thickness range below 30 nm the polar Kerr effect value OK changes nonmonotonically and depends on a wavelength of the incident light. For the films thicker than 30 nm, this value depends weakly on both the thickness and the wavelength. These features in the OK behavior are attributed to the Faraday effect, which is revealed at small thicknesses upon light reflection from the lower surface of a magnetic layer. It is found that the Faraday effect in the Co-P films exceeds that in the Co films by a factor of more than two. This effect is assumed to be caused by the presence of a Pd underlayer in the samples under study. (C) 2011 Elsevier BY. All rights reserved.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia

Доп.точки доступа:
Chzhan, A. V.; Patrin, G. S.; Kiparisov, S. Y.; Seredkin, V. A.; Середкин, Виталий Александрович; Burkova, L. V.; Буркова, Людмила Викторовна; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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14.

    Induced magnetic anisotropy of Co-P thin films obtained by electroless deposition / A. V. Chzhan, S. A. Podorozhnyak, S. M. Zharkov [et al.] // J. Magn. Magn. Mater. - 2021. - Vol. 537. - Ст. 168129, DOI 10.1016/j.jmmm.2021.168129. - Cited References: 28. - The work is partially supported by the RFBR Foundation (10-02-00161-a project). The study has been carried out within the framework of the state task of the Ministry of science and higher education of the Russian Federation (topic No. FSRZ-2020-0011) . - ISSN 0304-8853
   Перевод заглавия: Индуцированная магнитная анизотропия тонких пленок Co-P, полученных химическим осаждением
Кл.слова (ненормированные):
Cobalt -- Cobalt compounds -- Coercive force -- Drops -- Electroless plating -- Magnetic anisotropy -- Magnetic fields -- Cover glass -- Deposition of films -- Diffraction peaks -- Electroless -- Hydrogen indices -- Induced magnetic anisotropy -- Magnetic anisotropy constant -- pH range -- Thin-films
Аннотация: Co1−x-Px films (x = 0.02–0.05) deposited on cover glass by electroless plating from aqueous solutions in a continuous magnetic field with the strength of 2.5 kOe are presented. It has been found that in the pH range from 7.2 to 9.3, two special areas can be distinguished, they are characterized by the deposition of films with qualitatively different parameters in them. So, the change of the pH of working solutions from 7.2 to 8.7 causes the increase in the value of the induced magnetic anisotropy constant KU from 2.5 × 105 erg/cm3 to 6 × 105 erg/cm3. If the value of the hydrogen index is still increasing, an uneven drop to 5 × 104 erg/cm3 is observed. In the same way, the coercivity HC changes; at first it grows from 700 Oe to 1.5 kOe, and then it drops to Oe units. The concentration of phosphorus in the range of 7.2 to 8.7 increases linearly from 2 to 3 wt%, and in the range of 8.7 to 9.3, it increases from 3 to 5 wt%. The x-ray diffraction data show that the samples obtained at pH<8.7 are characterized by the presence of the hcp phase of Co (α-Co). The observed reflections of films obtained at pH > 8.7 indicate the fcc-Co (β-Co) with the diffraction peak blurring: the greater the pH value of the samples obtained, the more the diffraction peak blurring. It is shown that the induced magnetic anisotropy in high-coercivity films relates to the modification of the Co lattice. The lattice passes from a distorted fcc to an hcp structure during the growth of crystallites in a magnetic field. The induced magnetic anisotropy appears in films that were obtained in the high pH field due to the ordering of magnetic ions pairs.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russian Federation
Nikolaev Institute of Inorganic Chemistry SB RAS, ave. Lavrentyev 3, Novosibirsk, Russian Federation

Доп.точки доступа:
Chzhan, A. V.; Podorozhnyak, S. A.; Zharkov, S. M.; Жарков, Сергей Михайлович; Gromilov, S. A.; Patrin, G. S.; Патрин, Геннадий Семёнович
}
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15.

Co5/3Nb1/3BO4: A new cobalt oxyborate with a complex magnetic structure / N. V. Kazak, N. A. Belskaya, E. M. Moshkina [et al.] // J. Magn. Magn. Mater. - 2021. - Vol. 534. - Ст. 168056, DOI 10.1016/j.jmmm.2021.168056. - Cited References: 50. - The authors acknowledge M. Molokeev for the orientating the single crystal for magnetic measurements. The X-ray diffraction and specific heat measurements were carried out in the Common Access Facility Centres of SB RAS (Krasnoyarsk, Russia) and P.N. Lebedev Physical Institute of RAS (Moscow, Russia). This work has been financed by the Russian Foundation for Basic Research (project no. 20-02-00559). We acknowledge financial support from the Spanish MINECO DWARFS project MAT2017-83468-R and Gobierno de Aragón (Group, E12-20R) . - ISSN 0304-8853
Кл.слова (ненормированные):
Warwickites -- Ferrimagnet
Аннотация: Needle-shape single crystals of Co5/3Nb1/3BO4 warwickite were grown using the flux technique. X-ray diffraction measurements have revealed an orthorhombic structure (Sp. Gr. Pbnm) where the octahedral M1 site is occupied by a mixture of Co2+/Nb5+ ions and the M2 site is exclusively filled by Co2+ ions. Using dc magnetization measurements it was established that the new material undergoes two magnetic transitions: an antiferromagnetic transition at TN1 = 27 K and a ferrimagnetic one at TN2 = 14 K, below which a hysteresis cycle opens. Both magnetic transitions are marked by anomalies in the specific heat. High magnetic anisotropy with c-axis as a hard magnetization direction was detected.

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Держатели документа:
Kirensky Institute of Physics, FRC SB RAS, Krasnoyarsk, Russian Federation
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Instituto de Nanociencia y Materiales de Aragon (INMA), CSIC-Universidad de Zaragoza and Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Zaragoza, Spain
P.N. Lebedev, Physical Institute of RAS, Moscow, 119991, Russian Federation

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Belskaya, N. A.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Bartolome, J.; Arauzo, A.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Gavrilkin, S. Y.; Gorev, M. V.; Горев, Михаил Васильевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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16.

Core-shell and bi-segmented cobalt-nickel nanorods prepared by electroless deposition / E. A. Denisova, L. A. Chekanova, S. V. Komogortsev [et al.] // IEEE Trans. Magn. - 2022. - Vol. 58, Is. 2. - Ст. 2300805, DOI 10.1109/TMAG.2021.3098747. - Cited References: 27. - This work was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, project number 20-43-240003. The authors thank the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center“ Krasnoyarsk Science Center SB RAS” for the provided equipment . - ISSN 0018-9464
Кл.слова (ненормированные):
bi-segmented Co-Ni rods -- core-shell rods -- magnetic properties -- electroless deposition
Аннотация: A porous polymer loaded with segmented nanorods of magnetic metal is very promising for the design of novel microwave devices. Arrays of bi-segmented Ni/Co and core-shell Ni@Co rods were prepared by electroless deposition into porous of polycarbonate track etched membrane. An intrinsic effective magnetic field of the magnetic composite nanorods aligned in the nonmagnetic template was studied by magnetization curves and ferromagnetic resonance. The effect of the interface boundaries for two types of bi-segmented rods with coaxial and along-axis Co/Ni segmentation to effective field was established.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation.
Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation.
Far Eastern Federal University, Vladivostok, 690950, Russian Federation.

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Chekanova, L. A.; Чеканова, Лидия Александровна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Rautsky, M. V.; Рауцкий, Михаил Владимирович; Nemtsev, I. V.; Немцев, Иван Васильевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Plotnikov, V. S.; Tkachev, V. V.; Li, O. A.; Dolgopolova, M. V.
}
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17.

    Iron-cobalt coatings produced using an eco-friendly route / E. A. Denisova, L. A. Chekanova, S. V. Komogortsev [et al.] // J. Supercond. Nov. Magn. - 2021. - Vol. 34, Is. 10. - P. 2681-2688, DOI 10.1007/s10948-021-05964-1. - Cited References: 35. - This work was funded by the Russian Foundation for Basic Research, Krasnoyarsk Territory, and Krasnoyarsk Regional Fund of Science, project number 20-43-240003 . - ISSN 1557-1939. - ISSN 1557-1947
   Перевод заглавия: Железо-кобальтовые покрытия, полученные экологически чистым путем

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
MAGNETIC-PROPERTIES
   FECO FILMS
   THIN-FILMS
   CO-FE
   ELECTRODEPOSITION
Кл.слова (ненормированные):
High-induction Fe-Co coating -- Electroless deposition -- Structure -- Magnetic properties -- Eco-friendly synthesis
Аннотация: A facile, low-cost, and green route for synthesis of high-induction Fe-Co coatings was developed. Within this approach, three natural reducing agents have been used for deposition of the metal coatings by electroless plating on dielectric and metallic substrates: arabinogalactan, starch, and sucrose. The Fe-Co alloy coatings with Co content from 0 to 94 at.% are nanocrystalline bcc solid solution with carbon additive no more than 2 at%, and pure Co coatings are of hcp structure. The magnetic properties of bcc-based iron-cobalt alloys have been investigated as a function of the atomic composition. A high-saturation magnetization of about 240 emu/g was obtained for Fe70Co30 alloy films deposited onto copper substrate. The local magnetic anisotropy of FeCo alloys increases with a decrease in iron content for all reducing agents. High magnetization close to those in the bulk Fe-Co alloys implies the prospective applications of synthesized Fe-Co coatings as magnetic shield and magnetic sensors.

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Держатели документа:
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Res Ctr KSC SB RAS, Sci Ctr, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Denisova, E. A.; Денисова, Елена Александровна; Chekanova, L. A.; Чеканова, Лидия Александровна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Nemtsev, I. V.; Iskhakov, R. S.; Исхаков, Рауф Садыкович; Dolgopolova, M. V.
}
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18.

    Thermoelectric properties and stability of the Re0.2Sr0.8CoO3-δ (Re = Gd, Dy) complex cobalt oxides in the temperature range of 300‒800 K / V. A. Dudnikov [et al.] // Ceram. Int. - 2019. - Vol. 45, Is. 5. - P. 5553-5558, DOI 10.1016/j.ceramint.2018.12.013. - Cited References: 38. - This study was supported by the Russian Science Foundation , project no. 16-13-00060 , Russia . - ISSN 0272-8842
   Перевод заглавия: Термоэлектрические свойства и стабильность Re0.2Sr0.8CoO3-δ (Re = Gd, Dy) сложных оксидов кобальта в температурном интервале 300-800 К
Кл.слова (ненормированные):
Substituted rare earth cobalt oxides -- Thermoelectric oxide materials -- Ordered and disordered states
Аннотация: Temperature dependences of the electrical resistivity and Seebeck coefficient of the Re0.2Sr0.8CoO3‒δ (Re = Gd, Dy) complex cobalt oxides in the temperature range of 300 – 800 K have been investigated. The effects of ordering in the cation and anion sublattices on the thermoelectric properties has been examined and their comparative analysis has been made. It was found that, in the investigated temperature range, the thermoelectric power factor of the ordered compounds significantly exceeds the analogous parameter of the disordered samples. The temperature dependence of the electrical resistivity was shown to obey the activation law. As the temperature increases, the samples undergo a semiconductor-semiconductor electronic transition with a decrease in the activation energy. The thermoelectric properties of all the samples are shown to be stable in the investigated temperature range. The maximum thermoelectric power factor of the ordered Dy0.2Sr0.8CoO2.67 cobaltite at a temperature of 360 K has been obtained; it amounts to 0.23 µW/(cm·K2), which is a good parameter for this class of materials.

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Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch”, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Institute of Engineering Physics and Radio Electronics, Krasnoyarsk, 660041, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Scientific Center, Russian Academy of Sciences, Siberian Branch”, Krasnoyarsk, 660036, Russian Federation
Ioffe Physicotechnical Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russian Federation

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Kazak, N. V.; Казак, Наталья Валерьевна; Fedorov, A. S.; Федоров, Александр Семенович; Solov'yov, L. A.; Vereshchagin, S. N.; Burkov, A. T.; Novikov, S. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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19.

    Исследование частиц ферригидрита легированного медью и кобальтом методом малоуглового рассеяния нейтронов / С. В. Столяр [и др.] // Магнитные материалы. Новые технологии : тез. докл. VIII Байкал. междунар. конф. BICMM-2018 / чл. прогр. ком. R. S. Iskhakov [et al.]. - Иркутск, 2018. - С. 131. - Библиогр.: 1 . - ISBN 978-5-00133-051-6
   Перевод заглавия: Investigation of copper-dopped and cobalt-dopped ferrigydrite nanoparticles by the method of small-angle neutron scattering

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Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Iskhakov, R. S. \чл. прогр. ком.\; Исхаков, Рауф Садыкович; Ovchinnikov, S. G. \чл. прогр. ком.\; Овчинников, Сергей Геннадьевич; Aplesnin, S. S. \чл. прогр. ком.\; Аплеснин, Сергей Степанович; Balaev, D. A. \чл. прогр. ком.\; Балаев, Дмитрий Александрович; Столяр, Сергей Викторович; Stolyar, S. V.; Балашою, М.; Ярославцев, Роман Николаевич; Yaroslavtsev, R. N.; Артемьева, А. С.; Байкальская международная конференция "Магнитные материалы. Новые технологии"(8 ; 2018 ; авг. ; 24-28 ; Иркутск); "Магнитные материалы. Новые технологии", Байкальская международная конференция(8 ; 2018 ; авг. ; 24-28 ; Иркутск); "Magnetic materials. New tecnologies", Baikal International Conference(8 ; 2018 ; Aug. 24-28 ; Irkutsk); Иркутский государственный университет
}
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20.

Study of Co x Pt 1-x nanoalloy formation mechanism via single-source precursors / E. Y. Filatov [et al.] // Powder Diffr. - 2019. - Vol. 34, Suppl. S1. - P. S27-S31, DOI 10.1017/S0885715619000162. - Cited References: 13. - This work was supported by the Russian Foundation for Basic Research (Grant nos. 17-03-00950 and 18-03-00777). Aleksei Chepurov acknowledges support of the state assignment project 0330-2016-0012. . - ISSN 0885-7156
Кл.слова (ненормированные):
nanoalloy formation -- powder diffraction -- nanoparticles -- cobalt -- platinum
Аннотация: This paper is devoted to the study of formation mechanism of metal solid solutions during the thermolysis of single-source precursors in Co–Pt systems with a wide range of superstructural ordering. It is shown that the thermal decomposition of [Pt(NH3)4][Co(C2O4)2(H2O)2]·2H2O salt in helium is critically different from that under hydrogen atmospheres. Thermal degradation under the helium atmosphere is followed by a gradual reduction of platinum and cobalt, and at each thermolysis temperature only one phase is present. At 380 °C an equiatomic Co0.50Pt0.50 solid solution is formed (a = 3.749 (4) Å, Fm−3m space group, V/Z = 13.17 Å3, crystallite size: 5–7 nm). When the precursor is decomposed under a hydrogen atmosphere, the process proceeds mainly through the simultaneous reduction of the platinum and cobalt atoms, and at each temperature section two metal phases are present. The formation of the close to equiatomic Co0.50Pt0.50 solid solution (a = 3.782 (4) Å, Fm−3m space group, V/Z = 13.52 Å3, crystallite size: 7–9 nm) occurs at 450 °C. The calculations of crystallite sizes are confirmed by transmission electron microscopy data.

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Держатели документа:
Novosibirsk State University, Pirogova str. 2, Novosibirsk, 630090, Russian Federation
Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentyev Ave. 3, Krasnoyarsk, 630090, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russian Federation
Sobolev Institute of Geology and Mineralogy SB RAS, Koptyuga Ave.3, Novosibirsk, 630090, Russian Federation

Доп.точки доступа:
Filatov, E. Y.; Zadesenets, A. V.; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Plyusnin, P. E.; Chepurov, A. A.; Korenev, S. V.
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