期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 269, 期 2, 页码 192-196出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-8853(03)00591-2
关键词
SrFe12O19; hexaferrites; Sm substitution; Mossbauer spectrometry; X-ray diffraction
M-type hexagonal ferrites of composition Sr1-xSmxFe12O19 with x = 0, 0.06, 0.11, 0.2 and 0.33 were produced by hydrothermal synthesis. The purity of the samples was investigated by X-ray diffraction and Mossbauer spectrometry. The analyses reveal for all the samples the presence of the hexagonal M-type phase as the main phase, but also the presence of Sm containing secondary phases of the (Sr,Sm)FeO3-delta type. The results of the Mossbauer analysis show that the hyperfine parameters of the M-type phase contribution do not vary with the Sm content, indicating that the Sm content in the M-type phase is very weak. This is in agreement with the fact that no Fe 21 is detected in the spectra. As both anisotropy field and saturation magnetization remain constant, the increase of the coercivity is thus attributed to microstructural changes, in relation with the presence of the Sin containing secondary phases. (C) 2003 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据