Increased Curie temperature and superexchange interaction geometry in bismuth and vanadium substituted YIG

1 January 1975

proceedings article
Published by AIP Publishing in AIP Conference Proceedings

Vol. 24 (1) , 372-373
https://doi.org/10.1063/1.30137

Abstract

An unexpectedly large Bi3 + for Y3 + substitution has been made in YIG; single crystals have the formula {Y1.2Bi1.88}[Fe2](Fe3)P1 2. The structures of this garnet and of single crystal {Bi0.34Ca2.66}[Fe2]−(Fe1.67V1.33)O12 have been refined, the purpose being to determine wheter there is a relation between the relatively high Curie temperatures of such garnets and the superexchange interaction geometry. The results indicate mainly an increase in the [Fe]−0 distances and a decrease in the (Fe)−0 distances as compared with the analogous distances in YIG. This may imply that d−p wave‐function overlap between (Fe3 +) and the intevening oxygen is more important than between Fe3 +] and the intervening oxygen in determining Ja d.

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