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Correlation between Magnetic Property and Cation Distribution in Z-type Hexagonal Barium-Ferrite (Ba3Co2-xFe24+xO41) by Neutron Diffraction
Published online by Cambridge University Press: 10 February 2011
Abstract
Z-type hexagonal ferrite samples in which cobalt is partially substituted with iron, Ba3Co2-xFe24+xO41 (x = 0, 0.2, 0.4, 0.6), were prepared by the ceramic process under a sintering oxygen partial pressure, PO2 = 21.3 or 101.3 kPa, at 1573 K. The influence of the substitution ratio and oxygen partial pressure on the complex permeability was investigated by examining the cobalt distribution over various cation sites in the Z-type structure with the neutron powder diffraction analysis performed at 294 K (neutron wave length was 1.006Å). The neutron diffraction pattern was studied with the Rietveld method. A significant difference in the preferential occupation of cobalt on various kind of cation sites was observed between the samples obtained under PO2 = 21.3 and 101.3 kPa. Almost all cobalt atoms are on the 12k octahedral site at the boundary between S- and R-blocks in the sample of x = 0, PO2 = 21.3 kPa. On the other hand, in the sample of x = 0, PO2 = 101.3 kPa, cobalt atoms are as well on other sites, the 12k octahedral site at the boundary between S- and T-blocks, the 4e tetrahedral site in S-block, the 2a octahedral site in T-block and the 2d five fold (trigonal bypiramid) site in T-block.
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- Copyright © Materials Research Society 2003
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