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CHEMISTRY AND MATERIAL SCIENCE
Single-domain particles of manganese-for-iron substituted M-type barium hexaferrite: synthesis, crystal structure, and magnetic properties
Pavel E. Kazina, Anastasia E. Sleptsovab, Alexander V. Vasilieva, Artem A. Eliseeva, Robert E. Dinnebierb, Sebastian Betteb a Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
b Max Planck Institute for Solid State Research, Stuttgart, Germany
Аннотация:
Single-phase barium hexaferrite powders with crystallite sizes in a single-domain region and with the general composition
BaFe$_{12-x}$Mn$_x$O$_{19}$, where $x$ = 0, 2, 4, 6, were synthesized applying a citric sol-gel auto-combustion technique with final annealing temperatures of 900 – 1200$^\circ$C. The crystal structures were refined, and the magnetic properties were studied. The observed variations in atomic positions with the Mn-for-Fe substitution revealed presence of Mn in three oxidation state +2, +3, and +4, with a preference of Mn$^{2+}$ to the tetrahedral 4f$_1$ site and Mn$^{4+}$ to the octahedral 2a and 12k sites. With the Mn-doping, the samples’ magnetization decreased, while coercivity increased and reached 8.4 kOe for $x$ = 6. The rise of the annealing temperature resulted in a slight growth of magnetization with a general tendency of the coercivity to decrease. A Curie temperature decreased with the Mn-doping remaining above room temperature for the maximal doping.
Ключевые слова:
magnetic materials, ferrites, crystal structure, magnetization, coercivity.
Поступила в редакцию: 29.12.2023 Исправленный вариант: 02.01.2024 Принята в печать: 03.01.2024
Образец цитирования:
Pavel E. Kazin, Anastasia E. Sleptsova, Alexander V. Vasiliev, Artem A. Eliseev, Robert E. Dinnebier, Sebastian Bette, “Single-domain particles of manganese-for-iron substituted M-type barium hexaferrite: synthesis, crystal structure, and magnetic properties”, Наносистемы: физика, химия, математика, 15:1 (2024), 80–97
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/nano1250 https://www.mathnet.ru/rus/nano/v15/i1/p80
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