期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 695, 期 -, 页码 3011-3017出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.11.356
关键词
W-type hexaferrite; Low oxygen pressure; Solid state reaction; Saturation magnetization; Anisotropy; Oxygen deficiency
资金
- BK21 PLUS program (BK21 PLUS SNU Materials Division for Educating Creative Global Leaders) through the National Research Foundation (NRF) - Ministry of Education of Korea [21A20131912052]
We report a successful preparation of strontium W-type hexaferrite (SrW: SrFe18O27) without a quenching method in a reduced oxygen atmosphere and its magnetic properties. The pure SrW poly-crystalline samples except their surface layer could be prepared by solid state reaction at 1300-1315 degrees C and subsequent furnace-cooling to room temperature in a low oxygen partial pressure of 10(-3) atm. Assintered SrW samples exhibited soft magnetic properties possessing high saturation magnetization values of 78.8(8)-81.3(8) emu/g and low coercivity values below 100 Oe. With increasing the sintering temperature, both saturation magnetization and anisotropy field values of samples were increased, which is attributable to an increased ratio of Fe2+/Fe3+ ions in the SrW phase induced by enhanced oxygen deficiency. (C) 2016 Elsevier B.V. All rights reserved.
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