Magnetic properties of Ln2−xLn′xCo17 compounds (Ln = Gd,Dy, Ho,or Er,Ln′ = Th or Ce) |
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Authors: | K.S.V.L. Narasimhan W.E. Wallace |
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Affiliation: | Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 USA |
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Abstract: | Magnetic and structural characteristics of the ternary systems Ln2?xThxCo17 (Ln = Gd, Dy, Ho, and Er) and Ln2?xCexCo17 (Ln = Gd, Dy, and Ho) are presented. Incorporation of Th in the lattice stabilizes the Th2Zn17 structure, whereas incorporation of Ce does not; if the binary system has the Th2Ni17 structure the incorporation of Ce leaves the structure unchanged. The antiferromagnetic LnCo coupling observed in the Ln2Co17 systems persists in the ternary alloys. The moment of the cobalt sublattice is decreased when more than half of the Ln is replaced by Th, suggesting that the extra electron contributed by Th enters the Co d-band or d-shell. The direction of easy magnetization is in the basal plane for all composition in the Gd, Dy, and Ho systems. In Er2?xThxCo17 the easy direction is along the c-axis for x = 0 and 0.2, but is in the basal plane for higher thorium contents. |
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