MOSSBAUER SPECTROMETRY STUDY OF MAGNESIOFERRITE PARTICLES

被引:36
作者
HAMDEH, HH
XIA, Z
FOEHRWEISER, R
MCCORMICK, BJ
WILLEY, RJ
BUSCA, G
机构
[1] WICHITA STATE UNIV,DEPT CHEM,WICHITA,KS 67260
[2] UNIV GENOA,IST CHIM,I-16129 GENOA,ITALY
[3] NORTHEASTERN UNIV,DEPT CHEM ENGN,BOSTON,MA 02115
关键词
D O I
10.1063/1.357835
中图分类号
O59 [应用物理学];
学科分类号
摘要
Fine particles of ferrimagnetic MgFe2O4 were synthesized through a sol-gel supercritical drying procedure, then cold-pressed and heated at 500 and 800-degrees-C. These materials were characterized by Mossbauer spectrometry in the temperature range 25-298 K, and in the presence of a small applied magnetic field. The Mossbauer measurements show that heat treatment results in the formation of a small percentage of alpha-Fe2O3, an increase in the mean particle size and hyperfine magnetic field, and a decrease in the inversion parameter of the magnesioferrite. An average anisotropy constant equivalent to the bulk magnetocrystalline anisotropy is estimated for particles with diameter D = 14 nm.
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页码:1135 / 1140
页数:6
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