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Optical absorption and luminescence of Tm3+ and Yb3+ ions in huntite structure / Malakhovskii A.V., Edelman I.S., Sokolov A.E., Sukhachov A.L., Temerov V.L., Gnatchenko S.L., Kachur I.S., Piryatinskaya V.G., Valiev U.V. // Республиканская конференция «Оптические методы в современной физике», Ташкент, Узбекистан, 2008, с. 33-35

Доп.точки доступа:
Malakhovskii, A. V.; Малаховский, Александр Валентинович; Edelman, I. S.; Эдельман, Ирина Самсоновна; Sokolov, A. Е.; Соколов, Алексей Эдуардович; Sukhachev, A. L.; Сухачев, Александр Леонидович; Temerov, V. L.; Темеров, Владислав Леонидович; Gnatchenko, S. L.; Kachur, I. S.; Piryatinskaya, V. G.; Valiev, U. V.
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Luminescence of manganese ions in yttrium aluminium borate / Aleksandrovsky A.S., Gudim I.A., Krylov A.S, Temerov V.E. // 15th International Conference on Luminescence and Optical Spectroscopy of Condensed Matter, Lyon, 2008, p.482

Доп.точки доступа:
Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Gudim, I. A.; Гудим, Ирина, Анатольевна; Krylov, A. S; Temerov, V. E.
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Malakhovskii, A. V.
Nature of magnetic circular dichroism and absorption spectra of f-f transitions in Na0.4Ho0.6F2.2 single crystal / A. V. Malakhovskii, V. V. Sokolov, D. N. Karimov // Chem. Phys. - 2024. - Vol. 581. - Ст. 112257, DOI 10.1016/j.chemphys.2024.112257. - Cited References: 25 . - ISSN 0301-0104. - ISSN 1873-4421
Кл.слова (ненормированные):
Magnetic circular dichroism -- f-f transitions -- Fluoride crystals -- Ho ions
Аннотация: We present first study of magnetic circular dichroism (MCD) spectra of Ho3+ ion in C4v local symmetry, which it has in fluorite Na0.4Ho0.6F2.2. Optical absorption and MCD spectra were studied in this single crystal in the region of 5I8> 5F3, 5F2, 3K8 and 5G5 transitions in the temperature range 3.6–––90 K. It was revealed, that number of transitions observed in the MCD and absorption spectra coincides with the number of transitions only from the doublet E state to singlet excited states. The E-E type transitions are not active in MCD, but they are not observed in the absorption spectra either. Paramagnetic magneto-optical activities (MOA) of the absorption bands and their temperature dependences were measured and interpreted with the help of the theory based on the nature of f-f transitions allowance. The MCD spectra were also analyzed in approximation of the J,±MJ wave functions of the free atom. It was shown in particular, that the lowest initial state of the transitions observed at T ˃ 10 K had MJ = 7, but this is not the lowest state of the holmium ion in the crystal. A little lower there is a quasi-doublet with MJ = 8 and, accordingly, with a higher magneto-optical activity of transitions from it. However, the intensity of transitions from this state is low.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russian Federation
Federal Scientific Research Centre «Crystallography and Photonics» of Russian Academy of Sciences, Leninskiy Prospekt 59, 119333 Moscow, Russia

Доп.точки доступа:
Sokolov, V. V.; Соколов, Валерий Владимирович; Karimov, D.N.; Малаховский, Александр Валентинович
}
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Aplesnin, S. S.
Regulation of the thermopower and ultrasound by magnetic field in manganese sulfide doped with variable-valence ions / S. Aplesnin, A. Kharkov, M. Sitnikov // Eur. Phys. J. Plus. - 2024. - Vol. 139, Is. 3. - Ст. 247, DOI 10.1140/epjp/s13360-024-05032-2. - Cited References: 50. - The study was supported by a grant from the Russian Science Foundation N 23-22-10016, the Krasnoyarsk Regional Science Foundation. The investigation of microstructural properties of the samples was carried out using equipment’s (SEM and TEM) the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS». The authors are grateful to A.V. Shabanov for the scanning electron microscopy investigations . - ISSN 2190-5444
Аннотация: The effect of cation nonstoichiometry and variable-valence samarium ions on the thermoelectric and structural characteristics of manganese sulfide is studed. Nonstoichiometry leads to a change in the thermopower sign in the antiferromagnetic region in a magnetic field and a decrease in the thermopower in the paramagnetic region. It is shown that the thermopower and Nernst–Ettingshausen coefficient of samarium-substituted manganese sulfide change their signs in the vicinity of structural and electronic transitions established from the thermal expansion coefficient. A decrease in the sound attenuation in a magnetic field is found. A correlation between the temperatures of the change of the sign of the Nernst–Ettingshausen effect and the change in electrosound in a magnetic field is established and explained within the model of carrier diffusion in the phase transition region. The conductivity control by the ultrasound is demonstrated.

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Держатели документа:
Reshetnev Siberian State University of Science and Technology, Krasnoyarsk, 660037, Russia

Доп.точки доступа:
Kharkov, A.; Sitnikov, M.; Аплеснин, Сергей Степанович
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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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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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Possible noncollinear magnetism and different valence state of manganese ions in quasi-low-dimensional ludwigites of (Ni,Cu,Mn)3BO5 / S. N. Sofronova, A. Veligzhanin, E. Eremin [et al.] // Phys. Status Solidi B. - 2023. - Vol. 260, Is. 5. - Ст. 2200457, DOI 10.1002/pssb.202200457. - Cited References: 30. - The equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” was used for measurements in this research. The authors thank E. Moshkina for providing the samples for the study. - Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity. Grant Number: 20-42-240011 . - ISSN 0370-1972. - ISSN 1521-3951
Кл.слова (ненормированные):
exchange interactions -- ferrimagnetism -- ludwigites -- noncollinear magnetism
Аннотация: The content of transition-metal ions and their valence state for three compositions of NixCuyMn3−x−yBO5 are estimated by the methods of X-ray absorption spectroscopy. In all the three compositions, the copper content does not exceed 0.25. One of the compositions has manganese ions both in the trivalent and bivalent states according to the K-edge position. The calculations of the total energies of various cation-ordered structures using the software package Wien2K show that copper ions predominately occupy one site, namely, 2(2d). The measurements of the magnetic properties show two types of magnetic transitions in all the three compositions, with one of them being in the range of 60–75 K and the other one at 10 K. Based on the exchange interactions calculated in the framework of the empirical model, magnetic ordering temperatures are estimated for two- and three-sublattice structures and the magnetic transition in the range of 60–75 K is supposed to be connected with magnetic moment ordering in sites 2 and 3.

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Держатели документа:
Kirensky Institute of Physics Federal Research Center KSC SB RAS 660036 Krasnoyarsk, Russia
Kurchatov Specialized Source of Synchrotron Radiation “KISI-Kurchatov” National Research Centre “Kurchatov Institute” 123182 Moscow, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Veligzhanin, Aleksey; Eremin, E. V.; Еремин, Евгений Владимирович; Chernyshev, A. V.; Чернышов, Артем Валерьевич; Kartashev, A. V.; Карташев, Андрей Васильевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
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Magnetic transitions and different valence states of manganese ions in solid solutions (Ni,Cu,Mn)3BO5 / S. N. Sofronova, E. V. Eremin, A. A. Veligzhanin [et al.] // Phys. Solid State. - 2023. - Vol. 65, Is. 2. - P. 260-269, DOI 10.21883/PSS.2023.02.55410.512. - Cited References: 22. - 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. 20-42-240011 . - ISSN 1063-7834. - ISSN 1090-6460
Кл.слова (ненормированные):
ludwigites -- magnetic phase transition -- indirect exchange interactions
Аннотация: The content of metal ions and their valence state for three NixCuyMn3–x–yBO5 compositions were estimated by EXAFS and XANES spectroscopy methods. In all three compositions, the copper y content did not exceed 0.25; in the third composition, some manganese ions entered the compound not only in the trivalent, but also in the divalent state. A detailed study of the magnetic properties showed that two magnetic transitions are observed in all compositions: one in the region of 60–75 K, and the second in the region of 10 K. Based on the exchange interactions calculated within the framework of the empirical model, the magnetic ordering temperatures for two- and three-lattice magnets were determined and it was assumed that the magnetic transition in the region of 60–75 K is associated with the ordering of magnetic moments in positions 2 and 3.

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Публикация на русском языке Магнитные переходы и разные валентные состояния ионов марганца в твердых растворах (Ni,Cu,Mn)3BO5 [Текст] / С. Н. Софронова, Е. В. Еремин, А. А. Велигжанин [и др.] // Физ. тверд. тела. - 2023. - Т. 65 Вып. 2. - С. 268-277

Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
National Research Center “Kurchatov Institute”, Moscow, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Eremin, E. V.; Еремин, Евгений Владимирович; Veligzhanin, A. A.; Chernyshov, A. V.; Чернышов, Артем Валерьевич; Kartashev, A. V.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич
}
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Chukalina, E. P.
Study of the magnetic properties of neodymium and samarium iron borates by the method of erbium spectroscopic probe / E. P. Chukalina, A. Jablunovskis, I. A. Gudim // Opt. Spectrosc. - 2023. - Vol. 131, Is. 8. - P. 630-636, DOI 10.1134/S0030400X23060024. - Cited References: 30. - This paper was carried out under financial support of the Russian Science Foundation (grant № 19-12-00413) . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
multiferroics -- optical spectroscopy -- crystals with rare earths -- Kramers ions
Аннотация: Iron borates NdFe3(BO3)4 and SmFe3 (BO3)4 activated with 1% erbium, with ahuntite structure (space symmetry group R32) were investigated by the method of erbium spectroscopic probe. From an analysis of the temperature dependence of the transmission spectra in the region of the 4I15/2 → 4113/2 transition in the Er3+ ion, it was found that both studied compounds order antiferromagnetically at TN ≈ 33 K into an easy-plane magnetic structure. No other phase transitions were found.

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Публикация на русском языке Чукалина Е. П. Исследование магнитных свойств ферроборатов неодима и самария методом спектроскопического эрбиевого зонда [Текст] / Е. П. Чукалина, А. Яблуновский, И. А. Гудим // Опт. и спектроскоп. - 2022. - Т. 130 Вып. 1. - С. 104-110

Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, 108840, Troitsk, Moscow, Russia
Moscow Institute of Physics and Technology (National Research University), 141701, Dolgoprudny, Moscow oblast, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Jablunovskis, A.; Gudim, I. A.; Гудим, Ирина Анатольевна
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10.

Synthesis and optical properties of nickel-doped copper metaborate crystals / A. D. Molchanova, E. M. Moshkina, M. S. Molokeev [et al.] // Opt. Spectrosc. - 2023. - Vol. 131, Is. 8. - P. 717-722, DOI 10.1134/S0030400X23060127. - Cited References: 18. - The study was performed with the support of Russian Science Foundation, RSF grant no. 19-12-00413 . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
3d-ions -- crystal growth -- optical spectroscopy -- magnetic ordering -- cuprates
Аннотация: This work presents information on the growth and spectroscopic study of single crystals of copper metaborate doped with nickel Cu1–xNixB2O4 (x = 0.05, 0.1). In the absorption spectra of both crystals, satellites related to Cu centers distorted by impurity Ni atoms were observed near the lines of zero phonon transitions. Polarization studies in the isotropic ab-plane of the tetragonal crystal Cu1–xNixB2O4 show the presence of linear magnetic dichroism in the magnetically ordered state, which was previously observed both in manganese-doped and undoped copper metaborates CuB2O4. The temperature of magnetic phase transitions into the collinear antiferromagnetic and into helicoidal structures, TN = 19.1 K and T * = 8.6 K, respectively, were determined from the temperature dependence of the dichroic signal.

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Публикация на русском языке Синтез и оптические свойства кристаллов метабората меди, легированного никелем [Текст] / А. Д. Молчанова, Е. М. Мошкина, М. С. Молокеев [и др.] // Оптика и спектроскопия. - 2022. - Т. 130 Вып. 1. - С. 111-115

Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, 108840, Moscow, Troitsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, 660036, Krasnoyarsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia
Scientific and Innovation Department, Kemerovo State University, 650000, Kemerovo, Russia

Доп.точки доступа:
Molchanova, A. D.; Moshkina, E. M.; Мошкина, Евгения Михайловна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Tropina, E. V.; Bovina, A. F.; Бовина, Ася Федоровна; Boldyrev, K. N.
}
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11.

Distribution of Co+ ions in single crystals of Li0.5Ga2.5O4 / V. A. Shapovalov, V. V. Shapovalov, T. V. Drokina [et al.] // Book of abstacts of Samarkand International Symposium on Magnetism (SISM-2023) / int. adv. com. S. G. Ovchinnikov [et al.]. - 2023. - Ст. 3PO-L9-10. - P. 211 . - ISBN 978-5-00202-320-2

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Держатели документа:
A. Galkin Donetsk Institue for Physics and Engineering
Organisation "Mathematics for America", New York
L.V. Kirensky Institute of Physics SB RAS

Доп.точки доступа:
Ovchinnikov, S. G. \int. adv. com.\; Овчинников, Сергей Геннадьевич; Shapovalov, V. A.; Shapovalov, V. V.; Drokina, T. V.; Дрокина, Тамара Васильевна; Vorotynov, A. M.; Воротынов, Александр Михайлович; Valkov, V. I.; Samarkand International Symposium on Magnetism(2023 ; July 2-6 ; Samarkand); Samarkand State University
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12.

    Magnetite nanoparticles diluted with Co and Mg ions: magnetic properties and application / O. S. Ivanova, E. S. Svetlitsky, D. A. Petrov, Yu. V. Knyazev // Магнитные материалы. Новые технологии : тез. докл. IX Байкал. междунар. конф. BICMM-2023 / чл. прогр. ком.: S. S. Aplesnin [et al.] ; чл. орг. ком. R. S. Iskhakov [et al.]. - Иркутск, 2023. - P. 93, DOI 10.26516/978-5-9624-2178-0.2023.1-207. - Библиогр.: 1 . - ISBN 978-5-9624-2178-0
   Перевод заглавия: Наночастицы магнетита, разбавленные ионами Co и Mg: магнитные свойства и применение

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Держатели документа:
Kirensky Institute of Physics SB RAS
Siberian Federal University

Доп.точки доступа:
Aplesnin, S. S. \чл. прогр. ком.\; Аплеснин, Сергей Степанович; Balaev, D. A. \чл. прогр. ком.\; Балаев, Дмитрий Александрович; Ovchinnikov, S. G. \чл. прогр. ком.\; Овчинников, Сергей Геннадьевич; Iskhakov, R. S. \чл. орг. ком.\; Исхаков, Рауф Садыкович; Ivanova, O. S.; Иванова, Оксана Станиславовна; Svetlitsky, E. S.; Petrov, D. A.; Петров, Дмитрий Анатольевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Байкальская международная конференция "Магнитные материалы. Новые технологии"(9 ; 2023 ; сент. ; 11-14 ; Байкальск); "Магнитные материалы. Новые технологии", Байкальская международная конференция(9 ; 2023 ; сент. ; 11-14 ; Байкальск); "Magnetic materials. New tecnologies", Baikal International Conference(9 ; 2023 ; Sept. ; 11-14 ; Baikalsk); Иркутский государственный университет
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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.

Magnetic properties of quasi-two-dimensional oxyborates (Ni,Cu,Mn)3BO5 with different composition of Cu ions / S. N. Sofronova, E. M. Moshkina, E. V. Eremin, M. S. Molokeev // VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022) : Book of abstracts / program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 1, Sect. : Low dimensional magnetism. - Ст. C.O5. - P. 335-336. - Cited References: 1. - The research was funded by RFBR, Krasnoyarsk Territory Krasnoyarsk Regional Fund of Science, project number 20-42-240011 . - ISBN 978-5-94469-051-7

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

Доп.точки доступа:
Ovchinnikov, S. G. \program com.\; Овчинников, Сергей Геннадьевич; Sofronova, S. N.; Софронова, Светлана Николаевна; Moshkina, E. M.; Мошкина, Евгения Михайловна; Eremin, E. V.; Еремин, Евгений Владимирович; Molokeev, M. S.; Молокеев, Максим Сергеевич; 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.

    Effect of ligand environment of rare-earth ions on temperature measurement performance of SrAO4:xEu3+ (A = Mo and W) phosphors / H. Gao, M. S. Molokeev, Q. Chen [et al.] // Ceram. Int. - 2022. - Vol. 48, Is. 24. - P. 36835-36844, DOI 10.1016/j.ceramint.2022.08.247. - Cited References: 58. - This work was supported by the National Natural Science Foundation of China (Grant No. 51802172) and the Natural Science Foundation of Qinghai Province (Grant No. 2021-ZJ-713) . - ISSN 0272-8842
   Перевод заглавия: Влияние лигандного окружения редкоземельных ионов на температурные характеристики люминофоров SrAO4:xEu3+ (A = Mo и W)
Кл.слова (ненормированные):
Luminescent thermometer -- Ligand environment -- Temperature measurement performance
Аннотация: Molybdate and tungstate with scheelite-type structure are excellent self-luminescent materials, which can be used as ideal hosts for the doping of rare-earth ions. In this study, a series of Eu3+-activated SrAO4 (A = Mo and W) phosphors were successfully synthesized, and their crystal structures, photoluminescence properties, and temperature measurement performance were analyzed in detail. These phosphors were excited by UV light (291 nm and 247 nm, respectively), with clear energy transfer (ET) (MoO42−→Eu3+ or WO42−→Eu3+). According to fluorescence intensity ratio (FIR) and Judd–Ofelt (J–O) theory, compared to SrWO4:0.01Eu3+ phosphor, SrMoO4:0.01Eu3+ phosphor exhibited better thermal stability, with relatively low Sa value (maximum values were 5.082 %K−1 and 20.74 %K−1, respectively), and their Sr values were not significantly different (maximum values were 0.864 %K−1 and 0.83 %K−1, respectively). Sa value was negatively correlated to central asymmetry of Eu3+, but the optimal Sr value tended to be more suitable for central asymmetry of Eu3+. In addition, Eu3+ exhibited stronger central asymmetry as well as covalency of Eu–O bond in SrMoO4. Results reveal that SrMoO4:xEu3+ and SrWO4:xEu3+ can be used for luminescent thermometers.

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Держатели документа:
School of Mechanical Engineering, Qinghai University, Xining, 810016, China
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Department of Physics, Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation

Доп.точки доступа:
Gao, H.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Chen, Q.; Yang, X.; Wang, X.; Ma, B.
}
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16.

Multicomponent flux growth and composition control of Cu2MnBO5:Ga ludwigites / E. Moshkina, A. Krylov, D. Kokh [et al.] // CrystEngComm. - 2022. - Vol. 24, Is. 19. - P. 3565-3575, DOI 10.1039/d2ce00258b. - Cited References: 26. - This study was supported by the Russian Science Foundation (Grant No. 21-72-00130). The Raman, X-ray, and EDX data were obtained using the analytical equipment of the Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center “Krasnoyarsk Science Center SB RAS” . - ISSN 1466-8033
Кл.слова (ненормированные):
Bismuth compounds -- Boron compounds -- Copper compounds -- Crystal symmetry -- Energy dispersive spectroscopy -- Gallium -- Manganese oxide -- Positive ions -- Sodium compounds
Аннотация: To reach the concentration phase boundary between antiferromagnetic Cu2GaBO5 and ferrimagnetic Cu2MnBO5 ludwigites, solid solutions Cu2Mn1−xGaxBO5 (x = 0.05, 0.1, 0.15, 0.175) were grown by the flux technique using a multi-component solvent based on Bi2Mo3O12 with the addition of Na2B4O7 which significantly influenced the crystal formation and cation composition of the studied compounds. The content of the flux system was corrected taking into account the earlier established relationship of the partition coefficients of Mn2O3 and Ga2O3. The influence of the solvent components on the ludwigite crystallization was analyzed. The maximum size of the grown crystal was 1 × 1 × 4 mm3. The structure and cation composition of the grown compounds were studied using X-ray (X-ray diffraction, EDX (energy-dispersive X-ray spectroscopy)) and vibrational (Raman) spectroscopy techniques. The phase boundary of Cu2MnBO5–Cu2GaBO5 was found to be in the concentration range of x = 0.15–0.175, corresponding to a change in the monoclinic axis direction and a leap in the lattice parameters. The symmetry evolution of metal–oxygen octahedra for four nonequivalent cation positions was analyzed, and the unique crystal structure of Cu2MnBO5 demonstrated high rigidity relative to the introduction of Ga3+ cations. The polarized Raman spectra of monoclinic ludwigites were obtained and studied for the first time. A comparison of the spectra of the studied samples in both phases and orthorhombic ludwigites was made. A number of spectral features due to the monoclinic distortions in the crystal were found. In agreement with the Raman experiment, the concentration phase boundary was close to 0.15.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660037, Russian Federation
Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Far Eastern State Transport University, Khabarovsk, 680021, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
St Petersburg University, St Petersburg, 199034, Russian Federation

Доп.точки доступа:
Moshkina, E. M.; Мошкина, Евгения Михайловна; Krylov, A. S.; Крылов, Александр Сергеевич; Kokh, D.; Shabanova, K.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Bovina, A. F.; Бовина, Ася Федоровна; Plyaskin, M.; Пляскин, Михаил Е.; Rostovtsev, N.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
}
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17.

The effect of copper and iron adsorption on the catalytic performance of alumina nanofiber / nanodiamond composite in sensing applications / N. O. Ronzhin, E. D. Posokhina, E. V. Mikhlina [et al.] // J. Phys. Chem. Solids. - 2022. - Vol. 167. - Ст. 110785, DOI 10.1016/j.jpcs.2022.110785. - Cited References: 68. - This work is supported by the Russian Foundation for Basic Research, Project 18–29–19078. The authors would like to express their special thanks to Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS» for providing the equipment to ensure the accomplishment of this project . - ISSN 0022-3697
Кл.слова (ненормированные):
Nanodiamonds -- Alumina nanofibers -- Indicator system -- Copper ions -- Iron ions -- Phenol detection
Аннотация: Phenolic compounds are common environmental pollutants, which are used in many industries and contaminate water environment due to industrial wastewater discharge. Presently, there is an increasing demand for the development and improvement of inexpensive, easy-to-use analytical tools for in-situ detection of phenolic compounds. In this work, we investigate the effect of adsorption of Cu2+ and Fe2+ ions on the catalytic activity of a composite material based on alumina nanofibers (ANF) and detonation nanodiamonds (DND) in the co-oxidation of phenols with 4-aminoantipyrine in the presence of hydrogen peroxide. We have found more than two-fold increase of the catalytic activity for ANF + DND + Cu composite, while the activity of ANF + DND + Fe composite is found to decrease by several times in comparison with the original ANF + DND material. The results of FTIR analysis indicate that the adsorption of iron ions occurs with the formation of hydroxide surface groups and hydrogen bonds, which apparently block their catalytic activity in the Fenton redox cycle. The higher catalytic performance of AND + DND composite functionalized with copper ions makes it possible to detect two times lower concentrations of analytes (phenol and 4-chlorophenol) in comparison with the original composite. It is shown that the AND + DND + Cu composite provides a linear yield of the co-oxidation reaction product in a wide range of analyte concentrations (0.25–100 μM for phenol and 0.5–25 μM for 4-chlorophenol). Model experiments demonstrate the applicability of copper-functionalized composite as a reusable sensor for the determination of phenol in aqueous samples.

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Держатели документа:
Institute of Biophysics SB RAS, Akademgorodok 50/50, Krasnoyarsk, 660036, Russian Federation
Institute of Computational Modelling SB RAS, Akademgorodok 50/44, Krasnoyarsk, 660036, Russian Federation
Kirensky Institute of Physics SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Svobodny 79, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Ronzhin, N. O.; Posokhina, E. D.; Mikhlina, E. V.; Shestakov, N. P.; Шестаков, Николай Петрович; Nemtsev, I. V.; Немцев, Иван Васильевич; Bondar, V. S.; Ryzhkov, I. I.
}
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18.

    Многоминимумность потенциала кристаллического поля в координационных материалах / В. В. Шаповалов, В. А. Шаповалов, В. И. Вальков [и др.] // Физ. техн. выс. давл. - 2022. - Т. 32, № 2. - С. 52-66. - Библиогр.: 30 . - ISSN 0868-5924
   Перевод заглавия: Multi-minimum potential of crystal field in coordination materials
Кл.слова (ненормированные):
электронный парамагнитный резонанс -- монокристалл шпинели -- элементарная ячейка кристаллической решетки -- структурно-неэквивалентные положения ионов -- electron paramagnetic resonance -- single-crystal spinel -- lattice unit cell -- structurally non-equivalent positions of ions
Аннотация: Форма многоминимумного потенциала электрического кристаллического поля в нанокомплексе с магнитным ионом формируется ближайшим окружением иона и имеет несколько эквивалентных минимумов, которые соответствуют кристаллографическим осям комплекса. Для описания спектров электронного парамагнитного резонанса (ЭПР) магнитных ионов используется модель кристаллического поля и формализм спинового гамильтониана. Метод спинового гамильтониана позволяет описать спектр электронного парамагнитного резонанса. Задача теории - получение констант на основе определенной модели кристалла. Задача эксперимента - определение этих констант из вида спектра.
The form of a multi-minimum potential of the electrical crystal field in a nanocomplex with a magnetic ion is formed by the nearest environment of the ion and characterized by several equivalent minima that are associated with crystallographic axes of the complex. To describe the spectra of electron paramagnetic resonance of magnetic ions (EPR), the model of crystal and the formalism of spin Hamiltonian is used. The method of spin Hamiltonian allows description of the spectrum of electron paramagnetic resonance. The theory is aimed to calculation of the constants within the frameworks of the determined model of the crystal. The experiment goal is evaluation of these constants on the basis of the spectrum shape.

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Держатели документа:
Организация «Математика для Америки», Нью Йорк, США
Донецкий физико-технический институт им. А.А. Галкина, Донецк, Украина
Институт физики им. Л.В. Киренского РАН, Красноярск, Россия
Институт радиотехники и электроники им. В.А. Котельникова РАН, Москва, Россия

Доп.точки доступа:
Шаповалов, В. В.; Шаповалов, В. А.; Вальков, В. И.; Службин, Ю. А.; Дрокина, Тамара Васильевна; Drokina, T. V.; Воротынов, Александр Михайлович; Vorotynov, A. M.; Шавров, В. Г.
}
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19.

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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20.

Chukalina, E. P.
Study of the magnetic properties of neodymium and samarium iron borates by the method of erbium spectroscopic probe / E. P. Chukalina, A. Jablunovskis, I. A. Gudim // Opt. Spectrosc. - 2022. - Vol. 130, Is. 1. - P. 98-104, DOI 10.21883/EOS.2022.01.52993.23-21. - Cited References: 30. - This paper was carried out under financial support of the Russian Science Foundation (grant № 19-12-00413) . - ISSN 0030-400X. - ISSN 1562-6911
Кл.слова (ненормированные):
multiferroics -- optical spectroscopy -- crystals with rare earths -- Kramers ions
Аннотация: Iron borates NdFe3(BO3)4 and SmFe3(BO3)4 activated with 1% erbium, with a huntite structure (space symmetry group R32) were investigated by the method of erbium spectroscopic probe. From an analysis of the temperature dependence of the transmission spectra in the region of the 4I15/2 → 4I13/2 transition in the Er3+ ion, it was found that both studied compounds order antiferromagnetically at TN ≈ 33 K into an easy-plane magnetic structure. No other phase transitions were found.

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Держатели документа:
Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, Russia
Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia

Доп.точки доступа:
Jablunovskis, A.; Gudim, I. A.; Гудим, Ирина Анатольевна
}
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