najoNanosystems: Physics, Chemistry, MathematicsНаносистемы: физика, химия, математика2220-80542305-7971Университет ИТМО10.17586/2220-8054-2024-15-1-80-97najo-67Research ArticleCHEMISTRY AND MATERIAL SCIENCEХИМИЯ И МАТЕРИАЛОВЕДЕНИЕSingle-domain particles of manganese-for-iron substituted M-type barium hexaferrite: synthesis, crystal structure, and magnetic propertiesМонодоменные частицы гексаферрита бария с замещением железа на марганец: синтез, кристаллическая структура и магнитные свойстваhttps://orcid.org/0000-0002-1415-2190КазинП. Е.KazinP. E.

Pavel E. Kazin - Department of Chemistry

Moscow

kazin@inorg.chem.msu.ruhttps://orcid.org/0000-0002-4788-2624СлепцоваА. Е.SleptsovaA. E.

Anastasia E. Sleptsova

Heisenbergstrasse 1, 70569 Stuttgart

sleptsovaanastasia@gmail.comhttps://orcid.org/0000-0003-4108-9040ВасильевА. В.VasilievA. V.

Alexander V. Vasiliev - Department of Chemistry

Moscow

a.vasiliev@inorg.chem.msu.ruhttps://orcid.org/0000-0002-3644-9673ЕлисеевА. А.EliseevA. A.

Artem A. Eliseev - Department of Chemistry

Moscow

artem.a.eliseev@gmail.comhttps://orcid.org/0000-0003-2778-2113ДиннебирР. Е.DinnebierR. E.

Robert E. Dinnebier

Heisenbergstrasse 1, 70569 Stuttgart

R.Dinnebier@fkf.mpg.dehttps://orcid.org/0000-0003-3575-0517БеттеС.BetteS.

Sebastian Bette

Heisenbergstrasse 1, 70569 Stuttgart

s.bette@fkf.mpg.deLomonosov Moscow State UniversityRussian FederationMax Planck Institute for Solid State ResearchGermany2024310520251518097Copyright © Kazin P.E., Sleptsova A.E., Vasiliev A.V., Eliseev A.A., Dinnebier R.E., Bette S., 20252025Казин П.Е., Слепцова А.Е., Васильев А.В., Елисеев А.А., Диннебир Р.Е., Бетте С.Kazin P.E., Sleptsova A.E., Vasiliev A.V., Eliseev A.A., Dinnebier R.E., Bette S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://nanojournal.ifmo.ru/jour/article/view/67

Single-phase barium hexaferrite powders with crystallite sizes in a single-domain region and with the general composition BaFe12−xMnxO19, where x = 0, 2, 4, 6, were synthesized applying a citric sol-gel auto-combustion technique with final annealing temperatures of 900 – 1200 ◦C. The crystal structures were refined, and the magnetic properties were studied. The observed variations in atomic positions with the Mnfor-Fe substitution revealed presence of Mn in three oxidation state +2, +3, and +4, with a preference of Mn2+ to the tetrahedral 4f1 site and Mn4+ 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.

С использованием цитратного золь-гель метода с самораспространяющимся термическим процессом и финальным отжигом прекурсоров при 900 – 1200 °C были синтезированы порошки гексаферрита с размерами кристаллитов в монодоменном диапазоне общего состава BaFe12-xMnxO19, где x = 0, 2, 4, 6. Были уточнены их кристаллические структуры и изучены магнитные свойства. Наблюдаемые вариации в положении атомов при замещении Fe на Mn указывали на присутствие Mn в степенях окисления +2, +3 и +4 с предпочтением Mn2+ к тетраэдрической позиции 4f1 и Mn4+ к октаэдрическим позициям 2a и 12k. При допировании Mn намагниченность образцов уменьшалась, в то время как коэрцитивная сила возрастала, достигая 8.4 кЭ для x = 6. Рост температуры отжига приводил к небольшому росту намагниченности с общей тенденцией уменьшения коэрцитивной силы. Температура Кюри понижалась с допированием Mn, оставаясь выше комнатной при максимальном допировании.

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The authors declare that there are no conflicts of interest present.