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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Gorev M. V., Molokeev M. S., Cherepakhin A. V., Kartashev A. V., Mikhashenok N. V., Sablina K. A.
Заглавие : Caloric characteristics of PbTiO3 in the temperature range of the ferroelectric phase transition
Место публикации : Phys. Solid State: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 54, Is. 9. - P.1832-1840. - ISSN 1063-7834, DOI 10.1134/S1063783412090181
Примечания : Cited References: 31. - This study was supported by the Russian Foundation for Basic Research (project no. 12-08-00079) and the Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools of the Russian Federation (grant no. NSh-4828.2012.2).
Предметные рубрики: SINGLE-CRYSTALS
LEAD TITANATE
DIELECTRIC PROPERTIES
SOLID-SOLUTIONS
PRESSURE
PEROVSKITES
DEPENDENCE
BEHAVIOR
HEAT
Аннотация: The heat capacity and thermal expansion of the PbTiO3 ceramic sample have been measured in the temperature range 80–970 K. The electrocaloric and barocaloric efficiencies of lead titanate in the ferroelectric phase transition range have been investigated by analyzing the experimental data in terms of the thermodynamic theory of phase transitions, the electrical equation of state P(T, E), the Pippard equation, and the S(T, p) diagram.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhaleva E. A., Kartashev A. V., Gorev M. V., Cherepakhin A. V., Sablina K. A., Mikhashenok N. V., Flerov I. N.
Заглавие : Caloric effects and phase transitions in ferroelectric-ferromagnetic composites (x) La0.7Pb0.3MnO3 – (1-x) PbTiO3
Коллективы : Functional Materials and Nanotechnologies
Место публикации : International Conference “Functional materials and nanotechnologies” FM&NT 2012. - 2012. - P.82
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Flerov I. N., Kartashev A. V., Gorev M. V., Cherepakhin A. V., Sablina K. A., Mikhashenok N. V., Volkov N. V., Shabanov A. V.
Заглавие : Caloric effects and phase transitions in ferromagnetic-ferroelectric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3
Коллективы : Russian Foundation for Basic Research [12-02-31253-mol-a]; Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" [N 8379]; Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools [NSh-4828.2012.2]
Место публикации : J. Mater. Res. - 2013. - Vol. 28, Is. 24. - P.3322-3331. - ISSN 0884-2914, DOI 10.1557/jmr.2013.360. - ISSN 2044-5326
Примечания : Cited References: 24. - This study was supported in parts by The Russian Foundation for Basic Research (Grant No. 12-02-31253-mol-a), Federal Special Program "Scientific and scientific-pedagogical staff of innovative Russia" (N 8379), and Council on Grants from the President of the Russian Federation for Support of Leading Scientific Schools (Grant NO. NSh-4828.2012.2). Dr. Maxim S. Molokeev is acknowledged for the x-ray characterization of the samples.
Предметные рубрики: PRESSURE
TEMPERATURE
Аннотация: Ceramic volumetric composites xLa(0.7)Pb(0.3)MnO(3)-(1-x)PbTiO3 (x = 0.18 and 0.85) were prepared. X-ray investigations have shown that rather low sintering temperature (800 degrees C) has allowed us to avoid the reaction and interdiffusion between two initial phases. Heat capacity, thermal expansion, and intensive magnetocaloric effect were measured in a wide temperature range. The sample composition has a low influence on temperatures of the ferromagnetic and ferroelectric phase transitions in composites. Electro- and barocaloric effects were determined by analysis in the framework of thermodynamic theory, electric equation of state, Maxwell relationships, and entropy-temperature-pressure phase diagram. Multicaloric efficiency of composites is discussed and compared with that of initial La0.7Pb0.3MnO3 and PbTiO3 compounds. Variation of a relationship between components can significantly increase both barocaloric and magnetocaloric efficiency of compositional material due to the mechanical stress appearing between grains of different ferroic phases under magnetic field.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Freydman A. L., Popkov S. I., Krasikov A. A., Mikhashenok N. V.
Заглавие : Capacitance dilatometer for small deformations measurements caused by external magnetic and electric fields and temperature
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow International Symposium on Magnetism (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.5PO-I2-2. - P.1047 (Шифр 29916280)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gudim I. A., Eremin E. V., Mikhashenok N. V., Titova V. R.
Заглавие : Comparison of magnetic properties of GdFe3(BO3)4, ferroborates grown using various solvents
Место публикации : Phys. Solid State. - 2023. - Vol. 65, Is. 2. - P.235-239. - ISSN 10637834 (ISSN), DOI 10.21883/PSS.2023.02.55406.505. - ISSN 10906460 (eISSN)
Примечания : Cited References: 18. - This study was supported by grant No. 22-12-20019 provided by the Russian Science Foundation and the Krasnoyarsk Regional Science Foundation (https://rscf.ru/project/22-72-00017/)
Аннотация: GdFe3(BO3)4, single crystals were grown from melt-solutions based on bismuth trimolybdate and lithium tungstate. Single crystals of gadolinium ferroborate from lithium-tungstate solution-melt were grown for the first time. The magnetic properties of the grown crystals are compared. It is shown that the GdFe3(BO3)4, ferroborate obtained using bismuth solution-melt trimolybdate contains impurities of Bi3+ ions (6% at.), which replace Gd3+ ions. Whereas GdFe3(BO3)4, ferroborate grown from a solution-melt based on lithium tungstate does not seem to contain such uncontrolled impurities.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kartashev A. V., Flerov I. N., Gorev M. V., Mikhashenok N. V.
Заглавие : Effect of Isovalent Cation Substitution on the Thermal, Caloric, and Magnetocaloric Properties of the (La1 – yEuy)0.7Pb0.3MnO3 Manganites
Место публикации : Phys. Solid State. - 2019. - Vol. 61, Is. 1. - P.62-68. - ISSN 10637834 (ISSN) , DOI 10.1134/S1063783419010116
Примечания : Cited References: 27. - This study was supported by the Russian Foundation for Basic Research, the Government of the Kras-noyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of the Scientific and R&D Activity, project no. 17-42-240076 “Complex Approach to Searching and Development of Promising Solid-State Ferroic Cooling Agents Based on the Single-and Multicaloric Effects.” The authors thank M.S. Molokeev for structural characterization of the composites.
Аннотация: Crystalline samples of the (La1 – yEuy)0.7Pb0.3MnO3 (y = 0, 0.2, 0.4, 0.5, 0.6, and 0.8) manganite solid solutions have been grown. Temperature dependences of the specific heat, thermal expansion, and high-intensity magnetocaloric effect have been investigated. A comparative analysis of the effect of isovalent cationic substitution on the thermal and caloric parameters of the ferromagnetic phase transition has been made. It has been shown that the growth of the Eu atom concentration leads to a decrease in the phase transition entropy and an increase in the baric coefficient dT/dp. Field and temperature dependences of the magnetocaloric effect have been established. It is demonstrated that, varying the ratio of cations, one can obtain the solid solutions with the maximum magnetocaloric effect value in fields of up to 6 kOe in a temperature range of 90–340 K. Owing to the similar reduced relative cooling powers, the investigated solid solutions can be used as reference solid-state cooling media in designing the cascade cooling systems.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhashenok N. V., Pankrats A. I., Gudim I. A., Skorobogatov S. A., Molokeev M. S.
Заглавие : Effect of synthesis conditions on the magnetic properties of chromium borate single crystals
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.127
Примечания : Cited References: 5. - РФН № 22-12-20019 ; Красноярский регион. фонд науки
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gudim I. A., Mikhashenok N. V., Vasiliev A. D., Melnikova S. V., Pavlovskii M. S., Skorobogatov S. A., Pankrats A. I.
Заглавие : Features of the melt–solution synthesis of the TbCr3(BO3)4 single crystals
Колич.характеристики :6 с
Место публикации : J. Cryst. Growth. - 2024. - Vol. 637-638. - Ст.127716. - ISSN 00220248 (ISSN), DOI 10.1016/j.jcrysgro.2024.127716. - ISSN 18735002 (eISSN)
Примечания : Cited References: 22. - The authors thank A.V. Zamkov for assistance in preparing the samples for the conoscopic study. The characterization and examination of the samples were performed at the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of SciencesThis study was supported in part by the Russian Science Foundation and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activity, project no. 22-12-20019
Аннотация: The phase formation of terbium chromoborate TbCr3(BO3)4 in the bismuth trimolybdate and lithium tungstate melt–solutions has been studied. The absence of the terbium chromoborate trigonal phase in the bismuth trimolybdate-based system at all component ratios has been shown. The component ratio in the lithium tungstate-based system has been found at which the TbCr3(BO3)4 trigonal crystals are formed at temperatures above 1100 °C; below this temperature, the monoclinic phase dominates. The structural and magnetic properties of the grown crystals have been studied. It has been established that the trigonal and monoclinic TbCr3(BO3)4 crystals synthesized from the lithium tungstate-based solvent exhibit identical magnetic properties. At the same time, a significant difference of the magnetic properties of the single crystals synthesized from the bismuth molybdate melt–solution has been observed. This difference has been attributed to the effect of Bi3+ ions that partially replace Tb3+ ions.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhashenok N. V., Soloviev L. A., Nazarenko I. I., Eremin E. V., Sofronova S. N.
Заглавие : Heat capacity, structural and magnetic properties of mixed-valence Pb3(Mn,Cu)7O15
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 1. - Ст.G.03. - P.555. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 2
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Mikhashenok N. V., Sablina K. A., Bayukov O. A., Gorev M. V., Balaev A. D., Pankrats A. I., Tugarinov V. I., Velikanov D. A., Molokeev M. S., Popkov S. I.
Заглавие : Magnetic phase diagram of the olivine-type Mn2GeO4 single crystal estimated from magnetic, resonance and thermodynamic properties
Место публикации : J. Phys.: Condens. Matter. - 2013. - Vol. 25, No. 13. - Ст.136003. - P. - DOI 10.1088/0953-8984/25/13/136003
Аннотация: Mn2GeO4 single crystals with the olivine structure grown by the modified flux method have been investigated. Pronounced magnetic phase transitions at T1 = 47.7 K, T2 = 17 K and T3 = 5.5 K, with T2 being dependent on an applied magnetic field, have been found. Based on the data of magnetic, resonance and temperature measurements, the entire phase diagram of Mn2GeO4 has been built. Mn2GeO4 is shown to be a material with a complex magnetic structure consisting of two magnetic subsystems.
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11.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhashenok N. V., Eremin E. V., Molokeev M. S.
Заглавие : Magnetic properties and crystal structure Mn1-xNixGeO3 single crystal
Коллективы : Российская академия наук, Уральское отделение РАН, Институт физики металлов им. М. Н. Михеева Уральского отделения РАН, Уральский федеральный университет им. первого Президента России Б.Н. Ельцина, Российский фонд фундаментальных исследований, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : Euro-asian symposium "Trends in magnetism" (EASTMAG-2019): Book of abstracts/ чл. конс. ком.: S. G. Ovchinnikov, N. V. Volkov [et al.] ; чл. прогр. ком. D. M. Dzebisashvili [et al.]. - 2019. - Vol. 2. - Ст.K.P30. - P.369. - ISBN 978-5-9500855-7-4 (Шифр В33/E12-125657784)
Примечания : Cited References: 2
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gudim I. A., Eremin E. V., Titova V. R., Mikhashenok N. V.
Заглавие : Magnetic properties of TbCr3(BO3)4 groun from melt-solutions based on Bi2Mo3O12 and based on Li2WO4
Коллективы : Samarkand International Symposium on Magnetism, Samarkand State University
Место публикации : Book of abstacts of Samarkand International Symposium on Magnetism (SISM-2023)/ int. adv. com. S. G. Ovchinnikov [et al.]. - 2023. - Ст.3PO-L8-8. - P.200. - ISBN 978-5-00202-320-2
Примечания : Cited References: 1
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhaleva E. A., Eremin E. V., Flerov I. N., Kartashev A. V., Sablina K. A., Mikhashenok N. V.
Заглавие : Magnetization and magnetocaloric effect in La0.7Pb0.3MnO3 ceramics and 0.85(La0.7Pb0.3MnO3)–0.15(PbTiO3) composite
Коллективы : Council on Grants from the President of the Russian Federation forSupport of Leading Scientific Schools [NSh-924.2014.2]
Место публикации : J. Mater. Res. - 2015. - Vol. 30, Is. 2. - P.278-285. - ISSN 0884, DOI 10.1557/jmr.2014.369. - ISSN 20445326(eISSN)
Примечания : Cited References:29. - This work was supported by Council on Grants from the President of theRussian Federation for Support of Leading Scientific Schools (Grant No.NSh-924.2014.2).
Предметные рубрики: PHASE-TRANSITIONS
ELECTROCALORIC MATERIALS
Аннотация: The magnetization behavior under temperature and magnetic field variation was investigated for La0.7Pb0.3MnO3 ceramics and ferromagnetic-ferroelectric 0.85(La0.7Pb0.3MnO3)-0.15(PbTiO3) composite. The second-order ferromagnetic phase transition in manganite is shifted to the tricritical point in composite material. Comparison of the intensive caloric effect and the difference between relative cooling powers (RCP) in both materials proves a significant role of intrinsic pressure in elevating caloric efficiency in composite induced by elastic coupling between the grains of LPM and PT components. No temperature change in composite under an electric field of 2 kV/cm associated with electrocaloric effect or indirect magnetoelectric coupling was observed. The effect of magnetic field on some peculiar temperatures is considered. A contribution from pressure generated by magnetic field to baric coefficient dT/dp of ferromagnetic transformation temperature in composite was suggested. The results obtained were analyzed in the framework of the magnetic equation of state and compared with the experimentally measured heat capacity.
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14.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Mikhaleva E. A., Gorev M. V., Kartashev A. V., Flerov I. N., Sablina K. A., Mikhashenok N. V.
Заглавие : Multicaloric efficiency of ferroelectric-ferromagnetic volume composites(x)La0.7Pb0.3MnO3 - (1-x)PbTiO3
Коллективы : Joint Russia/CIS/Baltic/Japan Symposium on Ferroelectricity, International Conference Functional Materials and Nanotechnologies
Место публикации : Joint 12th Russia/CIS/Baltic/Japan Symposium on Ferroelectricity. 9th International Conference Functional Materials and Nanotechnologies/ International Conference Functional Materials and Nanotechnologies (9 ; 2014 ; Sept. 29 – Oct. 2 ; Riga). - 2014. - Ст.R-11. - P.172
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Oreshonkov A. S., Gerasimova J. V., Ershov A. A., Krylov A. S., Shaykhutdinov K. A., Vtyurin A. N., Molokeev M. S., Terent'ev K. Yu., Mikhashenok N. V.
Заглавие : Raman spectra and phase composition of MnGeO3 crystals
Коллективы : RFBR [13-02-00825]; Ministry of Science and Education of the Russian Federation
Место публикации : J. Raman Spectrosc.: Wiley-Blackwell, 2016. - Vol. 47, Is. 5. - P.531-536. - ISSN 0377-0486, DOI 10.1002/jrs.4816. - ISSN 1097-4555(eISSN)
Примечания : Cited References:21. - The work was partially supported by the RFBR through grants no. 13-02-00825.; O.A.S. and K.A.S. are partially supported by the Ministry of Science and Education of the Russian Federation.
Предметные рубрики: TENSOR ANALYSIS
SINGLE-CRYSTAL
POLYCRYSTALLINE
SPECTROSCOPY
PYROXENE
Ключевые слова (''Своб.индексиров.''): raman spectroscopy--lattice dynamics--raman tensor analysis--orthopyroxene--clinopyroxene
Аннотация: MnGeO3 single-crystal samples have been synthesized by optical zonal melting and spontaneous crystallization. X-ray crystal analysis showed the first sample to be a two-phase one with phase ratio as follows: 17% - monoclinic C2/c, and 83% - orthorhombic Pbca; the phase ratio of the second sample was unknown. Raman spectra have been produced for these samples. Lattice dynamics has been simulated and polarization dependencies of lines' intensities have been analyzed to interpret experimental Raman spectra and to attribute lines to the spectra of monoclinic and orthorhombic phases. Copyright (C) 2015 John Wiley & Sons, Ltd.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Mikhashenok N. V., Sablina K. A., Pankrats A. I., Tugarinov V. I., Balaev A. D., Gorev M. V.
Заглавие : Role of magnetic subsystems to form a complex magnetic structure Mn2GeO4 single crystals
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Solid State Phenom.: Selected, peer reviewed papers/ ed.: N. Perov, A. Semisalova: Trans Tech Publications Ltd, 2015. - Vol. 233-234: Achievements in Magnetism. - P.129-132. - ISSN 1662-9779, DOI 10.4028/www.scientific.net/SSP.233-234.129. - ISSN 978-3-03835-482-6
Предметные рубрики: Achievements in magnetism
Magnetic semiconductors and oxides
Ключевые слова (''Своб.индексиров.''): antiferromagnetic resonance--magnetic subsystems
Аннотация: Present paper reports of resonance properties of Mn2GeO4 single crystals. The data confirm the formation of a complex spiral magnetic structure at low temperatures. It is shown that the spin reorientation may be associated with the competition anisotropic contributions of the various subsystems of the manganese ions.
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17.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Volkov N. V., Mikhashenok N. V., Sablina K. A., Pankrats A. I., Balaev A. D., Gorev M. V.
Заглавие : Role of magnetic subsystems to form a complex magnetic structure Mn2GeO4 single crystals
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2014): 29 June - 3 July 2014 : вook of abstracts. - 2014. - Ст.1PO-J1-10. - P.517. - ISBN 978-5-91978-025-0
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkov N. V., Eremin E. V., Bayukov O. A., Sablina K. A., Solov'ev L. A., Velikanov D. A., Mikhashenok N. V., Osetrov E. I., Schefer J., Keller L., Boehm M.
Заглавие : Suppression of the long-range magnetic order in Pb-3(Mn1-xFex)(7)O-15 upon substitution of Fe for Mn
Место публикации : J. Magn. Magn. Mater.: Elsevier, 2013. - Vol. 342. - P.100-107. - ISSN 0304-8853, DOI 10.1016/j.jmmm.2013.04.054
Примечания : Cited References: 20. - The study was supported by the Ministry of Education and Science of Russian Federation, Project no. 8365 by the Siberian Branch of the Russian Academy of Sciences, integration Project nos. 29 and 2.5.2.
Предметные рубрики: PROFILE REFINEMENT
CRYSTAL-STRUCTURE
PB3MN7O15
Ключевые слова (''Своб.индексиров.''): crystal growth--ferrimagnetism--layered magnetic compounds
Аннотация: Structure and magnetic properties of Pb-3(Mn1-xFex)(7)O-15 single crystals with x=0-0.2 grown by spontaneous crystallization from solution in melt have been investigated. All the crystals belong to the hexagonal space group P6(3)/mcm. The magnetic properties appeared to be strongly dependent on the iron doping level. At small (x=0.05) dopant concentrations, the value of magnetization and Neel temperature T-N decrease insignificantly (T-N=70 K). With increasing x, the three-dimensional magnetic ordering does not occur and temperature dependences of magnetization at x = 0.1 exhibit spin-glass-like features in the low-temperature region. (c) 2013 Elsevier B.V. All rights reserved.
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Pankrats A. I., Gudim I. A., Molokeev M. S., Mikhashenok N. V.
Заглавие : Synthesis and magnetic properties of TbCr3(BO3)4 single crystals
Коллективы : 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", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. K: Magnetic semiconductors, multiferroics, topological insulators. - Ст.K.P11. - P.329-330. - ISBN 978-5-94469-051-7
Примечания : Cited References: 6. - This work is supported by RSF, grant no. 22-12-20019
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sofronova S. N., Eremin E. V., Molokeev M. S., Mikhashenok N. V., Kartashev A. V.
Заглавие : Synthesis and structural, magnetic, and thermal properties of the titanium-doped Pb3Mn7O15 compound
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk krai; Krasnoyarsk Territorial Foundation for Support of Scientific and RD Activities [18-42-240007]
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 4. - P.654-659. - ISSN 1063-7834, DOI 10.1134/S1063783421040223. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 10. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk krai, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 18-42-240007
Аннотация: The Pb3Mn7O15 crystals doped with titanium ions have been synthesized. The study of the structural properties has shown that titanium ions occupy positions in the interplane columns, which weakens the exchange coupling between the planes. Two anomalies in the temperature dependences of magnetization and heat capacity at 62 and 35 K have been found. It has been supposed that, at 62 K, the long-range magnetic order arises and, at 35 K, a spin-reorientation transition, as in the Pb3Mn7O15 compound, occurs.
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