Hydrothermal synthesis of barium hexaferrite

Danchevskaya, M.N.; Ivakin, Y.D.; Martynova, L.F.; Muravieva, G.P.

Информация о цитировании статьи получена из Web of Science, Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

Авторы: Danchevskaya M.N., Ivakin Y.D., Martynova L.F., Muravieva G.P.
Журнал: High Pressure Research
Том: 20
Номер: 1-6
Год издания: 2001
Издательство: Taylor & Francis
Местоположение издательства: United Kingdom
Первая страница: 265
Последняя страница: 271
DOI: 10.1080/08957950108206173
Аннотация: The authors of the report carried out synthesis of barium hexaferrite (BHF) both in water vapor atmosphere and in liquid medium in the temperature range 200-400degreesC at pressures P-H2O of 9-26 MPa in laboratory autoclaves. The results of research have shown that BHF with the best performances can be obtained by thermovaporous treatment of dry mixtures of precursors (gamma-Fe2O3 with barium hydroxide or nitrate). As Fe - containing precursor, alpha-FeOOH can be also used. The formation of BHF begins at the temperature of about 200degreesC. The BHF crystals arc hexagonal platelets with diameter less than or equal to I mum and thickness 0, 1 - 0,2 mum. The magnetic properties of synthesized BHF can be improved by increasing the temperature of thermovapor treatment. The coercive forces of the BHF samples synthesized at about 400degreesC vary from 1.7-2.0 kOe and specific saturation magnetization of nonoriented samples from 40 - 50 emu/g. BHF crystals with low coercive force (0.6-0.7) kOe were obtained by introduction of doping micro-additives at the stage of their formation in water vapor atmosphere.
Добавил в систему: Муравьева Галина Петровна

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