期刊
CERAMICS INTERNATIONAL
卷 37, 期 6, 页码 1725-1729出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2010.10.006
关键词
W-type hexa ferrites; Rare earth substitution; X-ray diffraction; SEM analysis; Vibrating sample magnetometry; Resistivity
A series of BaHoxFe16-xO27 (x = 0.0, 0.2, 0.4, 0.6, 0.8, 1.0) W-type hexagonal ferrites were prepared by co-precipitation technique at high annealing temperature of 1320 degrees C. XRD reveals single W-type hexagonal phase in these ferrites. The grain size is measured by SEM analysis using line intercept method. Saturation magnetization, retentivity and coercivity were measured from MH-loops taken on VSM. It was observed that magnetization increases with the increase of Ho content due to difference in ionic radii of Ho3+ (0.901 angstrom) and Fe3+ (0.67 angstrom) ions. Room temperature dc resistivity increases as a function of Ho3+ that may be due to separation between grains. The dc electrical resistivity decreases as a function of temperature which indicates the semi-conducting behavior of the samples. (C) 2011 Published by Elsevier Ltd and Techna Group S.r.l.
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