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Magnetostructural Investigation of Ball-Milled Cobalt-Copper Alloy [Текст] / R. S. Iskhakov, L. A. Kuzovnikova, S. V. Komogortsev [и др.] // Phys. Met. Metallogr. - Vol. 102, Suppl. 1, Chapter 11. - р. S64-S66DOI 10.1134/S0031918X0614016X. - Библиогр.: 6. - Russian Foundation for Basic Research (project no. 04-02-16230)
Аннотация: In this work we investigate a metastable inhomogeneous Co–Cu alloy produced by mechanical alloying. We use both conventional structural method (X-ray diffraction) and magnetic measurements of M(T) and M(H) dependences to obtain additional information about the process of mechanical alloying.

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Держатели документа:
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036 Russia
Institute of Chemistry and Chemical Technology, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036 Russia

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Kuzovnikova, L. A.; Кузовникова, Людмила Александровна; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Denisova, E. A.; Денисова, Елена Александровна; Balaev, A. D.; Балаев, Александр Дмитриевич; Mal'tsev, V. K.; Мальцев, Вадим Константинович; Bondarenko, G. N.; Бондаренко, Галина Николаевна
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Effect of cobalt concentration on the magnetic properties of the Co1–xMgxFe2O4 nanocrystals / O. S. Ivanova, I. S. Edelman, S. G. Ovchinnikov [et al.] // JETP Lett. - 2024. - Vol. 119, Is. 2. - P. 104-110, DOI 10.1134/S0021364023603457. - Cited References: 26. - The research was carried out at the expense of the Russian Science Foundation Grant # 23-22-10025, https://rscf.ru/project/23-22-10025/, Krasnoyarsk Regional Science Foundation . - ISSN 0021-3640. - ISSN 1090-6487
Аннотация: Nanoparticles of Co1–xMgxFe2O4 with x equal to 0, 0.2, 0.4, 0.6, 0.8 and 1.0 have been synthesized. For all values of x, they are nanocrystals with a cobalt ferrite structure and an average linear size (56 ± 3) nm. Based on the analysis of the Mossbauer effect spectra, the Co2+ ions were shown to occupy only octahedral positions at all values of x. The experimentally obtained dependence of the nanoparticles magnetization on x corresponds to the dependence calculated using the Mossbauer effect data, except for the sample with x = 1.0. The effective magnetic anisotropy constant estimated for 0 K from the analysis of the coercive force temperature dependences decreases from 5.27 × 106 at x = 0 to 1.29 × 106 erg/cm3 at x = 0.8 and drops sharply to 4 × 104 erg/cm3 at x = 1.0

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Публикация на русском языке Влияние концентрации кобальта на магнитные свойства нанокристаллов семейства Co1–xMgxFe2O4 [Текст] / О. С. Иванова, И. С. Эдельман, С. Г. Овчинников [и др.]. - 7 с. // Письма в ЖЭТФ. - 2024. - Т. 119 Вып. 2. - С. 111-117

Держатели документа:
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Sciences”, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Amity University Haryana, 122413, Gurugram, Haryana, India

Доп.точки доступа:
Ivanova, O. S.; Иванова, Оксана Станиславовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Thakur, A.; Thakur, P.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Ivantsov, R. D.; Иванцов, Руслан Дмитриевич; Molokeev, M. S.; Молокеев, Максим Сергеевич
}
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Crystal structure and thermoelectric properties of mechanically activated LaCoO3 / V. A. Dudnikov, Yu. S. Orlov, L. A. Solovyov [et al.] // J. Taiwan Inst. Chem. Eng. - 2024. - Vol. 162. - Ст. 105560, DOI 10.1016/j.jtice.2024.105560. - Cited References: 88. - This study was supported by the Russian Science Foundation , project no. 24-22-00091 . - ISSN 1876-1070. - ISSN 1876-1089
Кл.слова (ненормированные):
Rare-earth cobalt oxides -- Crystal structure -- Thermoelectric properties -- Mechanical activation
Аннотация: Background: Crystal structure of rare-earth LaCoO3 cobalt oxide subjected to high energy mechanical activation has been studied. In the temperature range of 300–800 K, the electrical conductivity and Seebeck coefficient were measured. Thermal conductivity was measured at 300–480 K. Methods: Comparative analysis of thermoelectric properties of the samples prepared by standard solid-state reaction and using high-energy mechanical activation was carried out. Findings: It was found that the experimental X-ray diffraction patterns are best described within the model that allows the coexistence of two domains in samples with the same crystal symmetry, but different lattice a and c parameters. The percentage ratio of these domains in the samples depends significantly on the size of the initial particles in the solid-state synthesis reaction and the annealing temperature. Mechanical activation and increase of synthesis temperature result in change of Seebeck coefficient sign and significant decrease of electrical resistivity. The Seebeck coefficient of non-activated samples takes positive values over the entire temperature range and decreases monotonically with increasing temperature, in contrast to mechanically activated samples exhibiting ambipolar behavior.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Orlov, Yu. S.; Орлов, Юрий Сергеевич; Solovyov, L. A.; Vereshchagin, S. N.; Ustyuzhanin, Yu. N.; Устюжанин, Юрий Николаевич; Zharkov, S. M.; Жарков, Сергей Михайлович; Zeer, G. M.; Borus, A. A.; Борус, Андрей Андреевич; Bondarev, V. S.; Бондарев, Виталий Сергеевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Distribution of cobalt Co2+ ions in single crystals of spinel Li0.5Ga2.5O4 / V. V. Shapovalov, V. A. Shapovalov, T. V. Drokina [et al.] // Phys. Met. Metallogr. - 2024. - Vol. 125, Is. 1. - P. 27-32, DOI 10.1134/S0031918X23602883. - Cited References: 22 . - ISSN 0031-918X. - ISSN 1555-6190
Кл.слова (ненормированные):
electron paramagnetic resonance -- spinel single crystal -- unit cell -- crystal lattice -- structurally nonequivalent positions of ions
Аннотация: The distribution of Co2+ ions over sublattices and structurally nonequivalent positions in the unit cell of the crystal lattice of a single crystal of lithium gallium spinel Li0.5Ga2.5O4 is shown. This distribution determines the properties of both mono- and nanocrystalline substances. The distribution is obtained by a special technology and is manifested in the electron paramagnetic resonance (EPR) spectra. The distribution of Co2+ ions depends on the structural and magnetic nonequivalence. The structural and magnetic nonequivalence causes a multiminimum behavior of the crystal field potential in the unit cells of single crystals at the locations of Co2+ ions. The Co2+ ions are found in complexes with tetrahedral and octahedral oxygen ions. Three types of EPR spectra of Co2+ ions have been found and investigated. The Cotetr2+ spectrum is attributed to the Co2+ ion, which replaces the Ga3+ ion located in a tetrahedral oxygen environment. The spectrum of the Cooct2+ ion located in the crystal field with axial symmetry belongs to the Co2+ ion replacing the Li+ ion located in an octahedral oxygen environment. The spectrum of the Cooct2+ ion located in a low symmetry crystal field belongs to the Co2+ ion replacing the Ga3+ ion located in an octahedral oxygen environment. The nearest cationic environment of the ion creates rhombic distortions due to the different valence numbers of Li+ and Ga3+. The results of studying the angular dependences of the spectra show the presence of four and twelve magnetically nonequivalent positions in the unit cells.

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Держатели документа:
Math for America (MfA), New York, USA
Galkin Donetsk Institute of Physics and Engineering, 283048, Donetsk, Russia
Kirenskii Institute of Physics, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Shapovalov, V. V.; Shapovalov, V. A.; Drokina, T. V.; Дрокина, Тамара Васильевна; Vorotynov, A. M.; Воротынов, Александр Михайлович; Val'kov, V. I.; Вальков, В. И.
}
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An effective method of magnetic hyperthermia based on the ferromagnetic resonance phenomenon / S. V. Stolyar, O. A. Li, E. D. Nikolaeva [et al.] // Phys. Met. Metallogr. - 2023. - Vol. 124, Is. 2. - P. 174-180, DOI 10.1134/S0031918X22601834. - Cited References: 15. - This study was supported by grant no. 22-14-20020 from the Russian Science Foundation and the Krasnoyarsk Regional Fund for Support of Scientific and Technological Activities. The authors are grateful to the Krasnoyarsk Regional Center for Collective Use at Federal Research Center Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, for providing their research facilities . - ISSN 0031-918X. - ISSN 1555-6190
Кл.слова (ненормированные):
ferromagnetic resonance -- cobalt ferrite -- nickel ferrite -- magnetic hyperthermia
Аннотация: Nickel and cobalt ferrite nanoparticles have been synthesized using the chemical precipitation method; the nanoparticle sizes were found to be 63 ± 22 and 26 ± 4 nm, respectively. The static hysteresis loops and Mossbauer spectra have been measured. It is shown that cobalt ferrite powders are magnetically harder than nickel ferrite powders. Ferromagnetic resonance (FMR) curves have been studied. It is found that the FMR absorption for cobalt ferrite is observed at room temperature and above. The time dependences of the nanoparticle warm-up under FMR conditions have been measured. The maximum temperature changes for nickel ferrite and cobalt ferrite particles are 8 and 11 K, respectively. Using the example of cobalt ferrite powder, the possibility of effectively heating of particles in the FMR mode in their own field without using a DC magnetic field source is shown. The observed effect can be used in magnetic hyperthermia.

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Публикация на русском языке Эффективный способ магнитной гипертермии, основанный на явлении ферромагнитного резонанса [Текст] / С. В. Столяр, О. А. Ли, Е. Д. Николаева [и др.] // Физ. металлов и металловед. - 2023. - Т. 124 № 2. - С. 182-189

Держатели документа:
Federal Research Center, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Stolyar, S. V.; Li, O. A.; Nikolaeva, E. D.; Vorotynov, A. M.; Воротынов, Александр Михайлович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bayukov, O. A.; Баюков, Олег Артемьевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович; P’yankov, V. F.; Volochaev, M. N.; Волочаев, Михаил Николаевич
}
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Investigation of structural, elastic and magnetic properties of Cu2+ ions substituted cobalt nano ferrites / A. Thakur, R. Verma, F. Wan [et al.] // J. Magn. Magn. Mater. - 2023. - Vol. 581. - Ст. 170980, DOI 10.1016/j.jmmm.2023.170980. - Cited References: 47. - This research work was supported by the National Key Research and Development Program of China (2022YFE010707). The author(s) would like to acknowledge the support provided under the DST-FIST Grant No. SR/FST/PS-I/2018/48 of Govt. of India. PT is thankful to DST-SERB TARE fellowship vide Sanction Order No TAR/2022/000414 . - ISSN 0304-8853. - ISSN 1873-4766
Кл.слова (ненормированные):
Nanoferrites -- Structure -- Rietveld Refinement -- Elastic Properties -- Magnetic Porperties
Аннотация: In the present work, we synthesized the Cu-doped CoFe2O4 (Co1-xCuxFe2O4) nanoparticles with x = 0.0, 0.2, 0.4 and 0.6, by employing the citrate precursor method. The X-ray Diffraction (XRD) pattern confirmed the pure cubic structure formation with the Fd-3m space group. To know the structural purity of each sample as well as the distribution of cations, Rietveld refinement was carried out. The crystallite size increases from 39.55 nm to 41.80 nm upto x = 0.2 and with further doping of Cu2+ ions it decreases to 36.27 nm. Similar variation is observed in the lattice parameter where the value of ‘a’ first increases from 8.378 Å to 8.381 Å and then decreases to 8.377 Å. The development of a non-uniform grain is seen using scanning electron microscope (SEM), which reveals the reduction in grain size. Fourier Transform Infrared Spectroscopy (FTIR) showed the two peaks ν1 and ν2 for all the samples around 541 cm−1 and 408 cm−1, respectively, which further decreases to 532.5 cm−1 and 402.5 cm−1 as the dopant ion concentration increases. The Stiffness constant, and Elastic modulus decrease with doping whereas, the Poisson’s ratio and Pugh’s ratio show a constant value of around 0.249 and 1.660, respectively. Vibrating Sample Magnetometer (VSM) analysis shows a decrease in saturation magnetization (σs) value from 76.85 emu/g to 43.62 emu/g. The net magnetic moment (nB) decreases from 3.29 μB to 1.85 μB and the effective anisotropy constant value decreases from 10.672erg/g to 4.461erg/g. Thus, the prepared nanoparticles provide a way forward for their industrial applications.

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Держатели документа:
School of Electronics and Information Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
NanoLatticeX, Amity University Haryana, Gurugram, Haryana 122413, India
Nanotechnology Wing, Innovative Science Research Society, Shimla 177002, India
Centre for Nanotechnology, Amity University Haryana, Gurugram 122413, India
Department of Physics, Amity University Haryana, Gurugram 122413, India
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, 50 Akademgorodok, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Thakur, Atul; Verma, Ritesh; Wan, Fayu; Ravelo, Fayu; Edelman, I. S.; Эдельман, Ирина Самсоновна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Thakur, Preeti
}
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Structure of metastable Sr0.8Dy0.2Co3-δ phases and their electrical and magnetic properties / V. A. Dudnikov, S. N. Vereshchagin, L. A. Solov’ev [et al.] // J. Exp. Theor. Phys. - 2022. - Vol. 134, Is. 3. - P. 290-299, DOI 10.1134/S1063776122030037. - Cited References: 40. - Investigation was supported by the Russian Foundation for Basic Research (grant no. 19-03-00017). Thermal and X-ray diffraction studies were conducted in the framework of State Task 0287-2021-0013 for the Institute of Chemistry and Chemical Technologies, Siberian Branch, Russian Academy of Sciences . - ISSN 1063-7761
Кл.слова (ненормированные):
Cobalt alloys -- Metastable phases -- Oxygen -- Perovskite -- Temperature distribution
Аннотация: Polycrystalline Sr0.8Dy0.2Co3-δ complex cobalt oxides with a different amount of oxygen (δ = 0.26, 0.44, 0.46) have been prepared by solid-state synthesis. An increase in oxygen deficiency causes the brownmillerite phase to appear in the perovskite structure, which significantly changes its properties. At δ = 0.46, the content of the brownmillerite phase reaches 38%. A comparative analysis of the magnetic and transport properties of synthesized samples has been carried out. The asymptotic Curie temperature changes sign from positive at δ = 0.26 to negative at δ = 0.46. The magnetoresistance of the sample with δ = 0.46 is negative and exceeds 40% at T = 10 K. The temperature dependence of resistivity is characteristic of semiconductors, and the absolute values for samples at low temperatures differ almost tenfold.

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Публикация на русском языке Структура, электрические и магнитные свойства метастабильных фаз Sr0.8Dy0.2CoO3-δ [Текст] / В. А. Дудников, С. Н. Верещагин, Л. А. Соловьев [и др.] // Журн. эксперим. и теор. физ. - 2022. - Т. 161 Вып. 3. - С. 346-357

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

Доп.точки доступа:
Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Vereshchagin, S. N.; Solov’ev, L. A.; Gavrilkin, S. Y.; Tsvetkov, A. Y.; Sitnikov, M. V.; Ситников, Максим Владиславович; Orlov, Yu. S.; Орлов, Юрий Сергеевич
}
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Effect of crystal size on the crystalline structure and magnetic properties of cobalt films obtained via chemical deposition / A. V. Chzhan, S. A. Podorozhnyak, S. A. Gromilov [et al.] // Bull. Russ. Acad. Sci. Phys. - 2022. - Vol. 86, Is. 5. - P. 614-617, DOI 10.3103/S1062873822050045. - Cited References: 18 . - ISSN 1062-8738
Кл.слова (ненормированные):
Anisotropy -- Crystal structure -- Crystals -- Deposition -- Magnetic field effects -- Anisotropic property -- Chemical deposition -- Co-P films -- Cobalt film -- Crystal-size -- Face-centred cubic -- Hexagonal close packed -- Induced anisotropy -- Sizes effect
Аннотация: A study is performed of the relationship between the sizes of cobalt crystallites and the coercive and anisotropic properties of Co–P films obtained via chemical deposition. The emergence of induced anisotropy in films obtained at low pH (7.2–8.7) is due to size effects that transform the cobalt’s crystal lattice from face-centered cubic to hexagonal close-packed as the film grows in a magnetic field.

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Публикация на русском языке Влияние размерных эффектов на кристаллическую структуру и магнитные свойства кобальтовых пленок, полученных химическим осаждением [Текст] / А. В. Чжан, С. А. Подорожняк, С. А. Громилов [и др.] // Изв. РАН. Сер. физич. - 2022. - Т. 86. № 5. - С. 730-734

Держатели документа:
Krasnoyarsk State Agrarian University, Krasnoyarsk, 660049, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Irkutsk State Transport University, Krasnoyarsk, 660028, Russian Federation

Доп.точки доступа:
Chzhan, A. V.; Podorozhnyak, S. A.; Gromilov, S. A.; Patrin, G. S.; Патрин, Геннадий Семёнович; Moroz, J. M.
}
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    Heterostructures based on cobalt phthalocyanine films decorated with gold nanoparticles for the detection of low concentrations of ammonia and nitric oxide / S. I. Dorovskikh, D. D. Klyamer, E. A. Maksimovskiy [et al.] // Biosensors. - 2022. - Vol. 12, Is. 7. - Ст. 476, DOI 10.3390/bios12070476. - Cited References: 74. - This work was funded by the Russian Science Foundation (grant 21-73-10142). The authors acknowledge the Russian Ministry of Education and Science (project 121031700314-5) for the access to literature search databases. TEM investigations were conducted in the SFU Joint Scientific Center . - ISSN 2079-6374
   Перевод заглавия: Гетероструктуры на основе пленок фталоцианина кобальта, декорированные наночастицами золота, для обнаружения низких концентраций аммиака и оксида азота
Кл.слова (ненормированные):
gold nanoparticles -- cobalt phthalocyanine -- gas-phase deposition -- chemiresistive sensors -- nitric oxide -- ammonia
Аннотация: This work is aimed at the development of new heterostructures based on cobalt phthalocyanines (CoPc) and gold nanoparticles (AuNPs), and the evaluation of the prospects of their use to determine low concentrations of ammonia and nitric oxide. For this purpose, CoPc films were decorated with AuNPs by gas-phase methods (MOCVD and PVD) and drop-casting (DC), and their chemiresistive sensor response to low concentrations of NO (10–50 ppb) and NH3 (1–10 ppm) was investigated. A comparative analysis of the characteristics of heterostructures depending on the preparation methods was carried out. The composition, structure, and morphology of the resulting hybrid films were studied by X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma atomic emission (ICP-AES) spectroscopy, as well as electron microscopy methods to discuss the effect of these parameters on the sensor response of hybrid films to ammonia and nitric oxide. It was shown that regardless of the fabrication method, the response of Au/CoPc heterostructures to NH3 and NO gases increased with an increase in the concentration of gold. The sensor response of Au/CoPc heterostructures to NH3 increased 2–3.3 times compared to CoPc film, whereas in the case of NO it increased up to 16 times. The detection limits of the Au/CoPc heterostructure with a gold content of ca. 2.1 µg/cm2 for NH3 and NO were 0.1 ppm and 4 ppb, respectively. It was shown that Au/CoPc heterostructures can be used for the detection of NH3 in a gas mixture simulating exhaled air (N2—74%, O2—16%, H2O—6%, CO2—4%).

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Держатели документа:
Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Lavrentiev Pr., Novosibirsk, 630090, Russian Federation
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Laboratory of Electron Microscopy, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Dorovskikh, S. I.; Klyamer, D. D.; Maksimovskiy, E. A.; Volchek, V. V.; Zharkov, S. M.; Жарков, Сергей Михайлович; Morozova, N. B.; Basova, T. V.
}
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10.

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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11.

Zhandun, V. S.
The spin-state transition in ACo2O4 spinels (A = Be, Mg, Ca, Cd, Zn) / V. S. Zhandun, O. N. Draganyuk // J. Magn. Magn. Mater. - 2022. - Vol. 552. - Ст. 169206, DOI 10.1016/j.jmmm.2022.169206. - Cited References: 51. - The reported study was funded by Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science to the research projects № 19-42-240016: «Control of structural, magnetic, electronic, and optical properties by pressure and intercalation into functional compounds with a spinel structure containing 3d and 4f ions» and № 20-42-240004: “The effect of the composition, pressure, and dimension on the magnetic, electronic, optical, and elastic properties of the magnetic Mn+1AXn (M = Cr, Mn; Fe, A = Al, Ga, Si, Ge, P, In; X = C, N; n = 1-3) MAX-phases”. The calculations were performed with the computer resources of “Complex modeling and data processing research installations of mega-class” SRC “Kurchatovsky Institute” (http://ckp.urcki.ru) . - ISSN 0304-8853
Кл.слова (ненормированные):
Ab initio calculations -- Spinels -- Cobalt ion -- Oxides -- Spin-state transition -- Thin films -- Pressure
Аннотация: The magnetic and electronic properties of the Co-based spinel oxides ACo2O4 (A = Be, Mg, Ca, Zn, Cd) were studied within GGA + U approach. It was found that the Co3+ ion is in a low-spin state due to the effect of the crystal field of octahedral symmetry. It is shown that Co3+ ion undergoes a spin-state transition into the high-spin state under the critical pressure of P = −10 GPa – −20 GPa. This pressure-induced spin-state transition is caused by the redistribution of electrons between the t2g- and eg-orbitals arising with increasing interatomic distances. The role of interatomic distances between Co3+ ion and its ligands is discussed. Thin-film form also favors the appearance of a high-spin state of Co3+ ion. At the same critical pressure, there is a sharp increase in the majority spin bandgap and a sharp decrease in the minority spin bandgap. These findings allow manipulating the spin state of Co3+ ions and bandgap width through the pressure or strain arising in thin films.

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Держатели документа:
Kirensky Institute of Physics - Federal Research Center “Krasnoyarsk Science Centre, Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Draganyuk, O. N.; Драганюк, Оксана Николаевна; Жандун, Вячеслав Сергеевич
}
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12.

Anisotropic thermal expansion and electronic transitions in the Co3BO5 ludwigite / N. Kazak, A. Arauzo, J. Bartolome [et al.] // Dalton Trans. - 2022. - Vol. 51, Is. 16. - P6345-6357, DOI 10.1039/d2dt00270a. - Cited References: 57. - We are grateful to the Russian Foundation for Basic Research (project no. 20-02-00559 and 21-52-12033) for supporting this paper. This work was performed within the framework of the budget project no. 0287-2021-0013 for the Institute of Chemistry and Chemical Technology SB RAS. We acknowledge the financial support from the Spanish Ministry of Economy, Industry and Competitiviness (MINECO), (Grant No. MAT2017-83468-R) and from the regional Government of Aragón (E12-20R RASMIA project) . - ISSN 1477-9226
Кл.слова (ненормированные):
Activation energy -- Anisotropy -- Cobalt compounds -- Crystal structure -- Electric conductivity -- Electronic properties -- Magnetic moments -- Magnetic susceptibility -- Negative thermal expansion
Аннотация: The investigations of the crystal structure, magnetic and electronic properties of Co3BO5 at high temperatures were carried out using powder X-ray diffraction, magnetic susceptibility, electrical resistivity, and thermopower measurements. The orthorhombic symmetry (Sp.gr. Pbam) was observed at 300 K and no evidence of structural phase transitions was found up to 1000 K. The compound shows a strong anisotropy of the thermal expansion. A large negative thermal expansion along the a-axis is observed over a wide temperature range (T = 300–600 K) with αa = −35 M K−1 at T = 500 K with simultaneous expansion along the b- and c-axes with αb = 70 M K−1 and αc = 110 M K−1, respectively. The mechanisms of thermal expansion are explored by structural analysis. The activation energy of the conductivity decreases significantly above 700 K. Electronic transport was found to be a dominant conduction mechanism in the entire temperature range. The correlations between the thermal expansion, electrical resistivity, and effective magnetic moment were revealed and attributed to the evolution of the spin state of Co3+ ions towards the spin crossover and gradual charge-ordering transition.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, 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, 50009, Spain
Research and Development Department, Kemerovo State University, Kemerovo, 650000, Russian Federation
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Kazak, N. V.; Казак, Наталья Валерьевна; Arauzo, A.; Bartolome, J.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Solovyov, L.; Borus, A.; Борус, Андрей Андреевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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13.

Fluctuations of the multiplicity of Co3+ ions and softening of the phonon spectrum of rare-earth cobalt oxides / Y. S. Orlov, V. A. Dudnikov, A. E. Sokolov [et al.] // JETP Letters. - 2022. - Vol. 115, Is. 10. - P. 615-619, DOI 10.1134/S0021364022100575. - Cited References: 25. - This work was supported by the Russian Science Foundation (project no. 18-12-00022) . - ISSN 0021-3640
Аннотация: An unconventional temperature dependence of infrared absorption spectra of rare-earth cobalt oxides LaCoO3 and GdCoO3 has been studied experimentally and theoretically in the temperature range of 3.2–550 K. A quite strong softening of the optical phonon mode has been detected, which cannot be explained by standard lattice anharmonicity. It has been shown that the redshift of the phonon spectrum is due to the e-lectron–phonon coupling quadratic in the lattice displacement and to fluctuations of the multiplicity of Co3+ ions.

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Публикация на русском языке Флуктуации мультиплетности ионов Co3+ и смягчение фононного спектра редкоземельных оксидов кобальта [Текст] / Ю. С. Орлов, В. А. Дудников, А. Э. Соколов [и др.] // Письма в ЖЭТФ. - 2022. - Т. 115 Вып. 9-10. - С. 650-655

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Sukachev Institute of Forest, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Orlov, Yu. S.; Орлов, Юрий Сергеевич; Dudnikov, V. A.; Дудников, Вячеслав Анатольевич; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Ovchinnikova, T. M.; Shestakov, N. P.; Шестаков, Николай Петрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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14.

Shiyan, Ya. G.
FMR method for determining the magnetization of thin cobalt films / Ya. G. Shiyan, L. A. Lee // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect. : Spin dynamics and magnetic resonances. - Ст. B.P20. - P. 296. - Cited References: 5. - This work was supported by the State order of the Ministry of Science and Higher Education of the Russian Federation (topic No. FSRZ-2020-0011) . - ISBN 978-5-94469-051-7

Материалы симпозиума, ,
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \program com.\; Овчинников, Сергей Геннадьевич; Lee, L. A.; Ли, Людмила Алексеевна; Шиян, Ярослав Германович; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
}
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15.

Dipole-dipole interaction weakening in ensembles of cobalt microspheres with a nonmagnetic core / S. V. Komogortsev, L. A. Chekanova, O. V. Shabanova [et al.] // Phys. Solid State. - 2022. - Vol. 64, Is. 9. - P. 1263-1268, DOI 10.21883/PSS.2022.09.54163.16HH. - Cited References: 32. - The study was done with financial support from the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory and the Krasnoyarsk Regional Fund of Science within scientific project No. 20-42-240001 . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
magnetic microspheres -- magnetic dipole-dipole interaction
Аннотация: Magnetic microspheres with nonmagnetic acrylic glass core were fabricated using electroless deposition. There are favorable conditions for magnetic flux closure within each particle. As a result, the dipole-dipole interaction in the powder of such microspheres is reduced drastically. This is the key difference between powders of magnetic microspheres and powders of full magnetic spherical particles witch behavior is significantly affected by the dipole-dipole interaction. The magnetic hysteresis in the cobalt microspheres with nonmagnetic core is significantly large then in the full cobalt particles produced using the same technique.

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Публикация на русском языке Ослабление диполь-дипольного взаимодействия в ансамблях микросфер кобальта с немагнитным ядром [Текст] / С. В. Комогорцев, Л. А. Чеканова, О. Г. Шабанова [и др.] // Физ. тверд. тела. - 2022. - Т. 64 Вып. 9. - С. 1272-1277

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Siberian State University of Science and Technology, Krasnoyarsk, Russia
Special Designing and Technological Bureau “Nauka” KSC SB RAS, Krasnoyarsk, Russia
Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia
Ural Federal University after the first President of Russia B.N. Yeltsin, Yekaterinburg, Russia

Доп.точки доступа:
Komogortsev, S. V.; Комогорцев, Сергей Викторович; Chekanova, L. A.; Чеканова, Лидия Александровна; Shabanova, O. V.; Shabanov, A. V.; Шабанов, Александр Васильевич; Nemtsev, I. V.; Немцев, Иван Васильевич; Neznakhin, D. S.; Denisova, E. A.; Денисова, Елена Александровна; Felk, V. A.; Mohov, A. A.; Мохов, Алексей Александрович; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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16.

Polukeev, S. I.
Exchange interaction in LaCoO3 between cobalt ions Co3+ in different spin states / S. I. Polukeev, V. A. Gavrichkov, S. G. Ovchinnikov // Phys. Solid State. - 2022. - Vol. 64, Is. 12. - P. 1887-1890, DOI 10.21883/PSS.2022.12.54381.426. - Cited References: 38. - The work was carried out with the financial support of the Russian Foundation for Basic Research (project No. 20-42-240016) . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
superexchange interaction -- magnetic structure -- Hubbard model -- projection operator method -- exchange loop
Аннотация: The values and signs of the contributions to the superexchange interaction of Co3+ ions in LaCoO3 in different spin states, namely, the superexchange of a pair of ions in the intermediate (IS) state and the superexchange of a pair of ions, one of which is in the intermediate state and the other in the high-spin (HS) state, are studied. For this purpose, virtual electron-hole pairs produced in the course of superexchange (the so-called exchange loops) have been studied within the framework of a multiband generalization of the Hubbard model. It is shown that the cobalt ions in the intermediate state are ordered ferromagnetically, while a pair of ions in different HS and IS states makes an AFM contribution to the superexchange.

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Публикация на русском языке Полукеев, Семен Игоревич. Обменное взаимодействие в LaCoO3 между ионами кобальта Co3+ в различных спиновых состояниях [Текст] / С. И. Полукеев, В. А. Гавричков, С. Г. Овчинников // Физ. тверд. тела. - 2022. - Т. 64 Вып. 12. - С. 1916-1919

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Gavrichkov, V. A.; Гавричков, Владимир Александрович; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Полукеев, Семен Игоревич
}
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17.

Magnetic resonance properties of low-dimensional cobalt – Al2O3-germanium tunnel contacts / A. V. Kobyakov, G. S. Patrin, V. I. Yushkov [et al.] // Magn. Reson. Solids. - 2022. - Vol. 24, Is. 2. - Ст. 22201, DOI 10.26907/mrsej-22201. - Cited References: 12. - The work was carried out in the process of fulfilling the state task of the Ministry of Science and Higher Education of the Russian Federation No. FSRZ-2020-0011 "Synthesis and physical foundations of nanoscale film and granular composite materials for spintronics devices" . - ISSN 2072-5981
Кл.слова (ненормированные):
magnetic resonance -- multilayer magnetic films -- nanostructures -- tunnel effect
Аннотация: The magnetic resonance properties of a low-dimensional cobalt-Al2O3-germanium tunnel contact are studied in this work. The appearance of minima observed at low temperatures on both sides of the cobalt layer was found on the thermomagnetic curve. The value of the temperature minimum differs in magnitude on both sides of the cobalt layer. The position of the minimum in the temperature dependence of magnetization depends on the sample preparation technology. As a result of layer growth, at least two magnetic phases appear. One contribution is from the spins of ferromagnetic particles (cobalt particles with a hexagonal close packed lattice), and additional contributions from the magnetically disordered phase of fine cobalt particles and Co-Al2O3 compounds.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Achinsk Branch of Krasnoyarsk State Agrarian University, Achinsk, 662100, Russian Federation

Доп.точки доступа:
Kobyakov, A. V.; Кобяков, Александр Васильевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Yushkov, V. I.; Юшков, Василий Иванович; Shiyan, Ya. G.; Шиян, Ярослав Германович; Rudenko, R. Yu.; Kosyrev, N. N.; Косырев, Николай Николаевич; Zharkov, S. M.; Жарков, Сергей Михайлович
}
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18.

Magnetic resonance properties of low-dimensional cobalt-Al2O3-germanium tunnel contact / A. V. Kobyakov, G. S. Patrin, V. I. Yushkov [et al.] // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect. : Spintronics and magnetic nanostructures. - Ст. A.P1. - P. 97-98. - Cited References: 4. - The work was carried out in the process of fulflling the state task of the Ministry of Science and Higher Education of the Russian Federation No. FSRZ-2020-0011 “Synthesis and physical foundations of nanoscale film and granular composite materials for spintronics devices” . - ISBN 978-5-94469-051-7

Материалы симпозиума, ,
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \program com.\; Овчинников, Сергей Геннадьевич; Kobyakov, A. V.; Кобяков, Александр Васильевич; Patrin, G. S.; Патрин, Геннадий Семёнович; Yushkov, V. I.; Юшков, Василий Иванович; Shiyan, Ya. G.; Шиян, Ярослав Германович; Rudenko, R. Yu.; Руденко, Роман Юрьевич; Kosyrev, N. N.; Косырев, Николай Николаевич; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
}
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19.

Chiromagnetic oxide cobalt nanoparticles: synthesis and magnitooptical properties / A. V. Kurilova, D. I. Klimenko, E. V. Kundelev [et al.] // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect. : Spintronics and magnetic nanostructures. - Ст. A.P59. - P. 209-210. - Cited References: 7. - The reported study was funded by RFBR, project number 20-32-90144 . - ISBN 978-5-94469-051-7

Материалы симпозиума, ,
Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
University ITMO, Sant-Peterburg, Russia
Siberian Federal University, Krasnoyarsk, Russia

Доп.точки доступа:
Ovchinnikov, S. G. \program com.\; Овчинников, Сергей Геннадьевич; Kurilova, A. V.; Klimenko, D. I.; Kundelev, E. V.; Sukhachev, A. L.; Сухачев, Александр Леонидович; Shulga, K. V.; Dubavik, A. U.; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Российская академия наук; Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН; Казанский (Приволжский) федеральный университет; Euro-Asian Symposium "Trends in MAGnetism"(8 ; 2022 ; Aug. ; 22-26 ; Kazan); "Trends in MAGnetism", Euro-Asian Symposium(8 ; 2022 ; Aug. ; 22-26 ; Kazan)
}
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20.

    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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