Abstract
The orthorhombic perovskite, (La1−x/2Bix/2)(Fe0.5Cr0.5)O3 was investigated for 0≤x≤1. Its space group, Pnma, compatible with the disordering of iron and chromium in the B sites, confirms previousobservations. More importantly this compound is found to be an uncompensated weakferromagnet, with a very peculiar zero magnetization behaviour, generally observed for orderedmagnetic cations in the B sites. It exhibits a magnetic transition at high temperature(TC) above 450 K, while the zero magnetization occurs between 100 and 160 K depending on thex-value. The AC magnetic susceptibility study shows that this compound does not exhibit aspin glass or cluster glass behaviour, in contrast to what was suggested for thex = 0 compound. This zero magnetization phenomenon can be interpreted by the factthat this perovskite is an uncompensated weak ferromagnet, which consists ofcanted weak ferromagnetic domains and clusters of pure chromium and pureiron composition, antiferromagnetically coupled through Cr–O–Fe interactions.
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