On magnetic properties of BiCrO3 and BiMnO3

Abstract

We investigated magnetic properties of BiCrO3 having the C2/c symmetry and Bi0.9Y0.1CrO3 having the Pnma symmetry with a 5.5451(1) , b 7.7185(2) , c 5.3882(1) . Bi0.9Y 0.1CrO3 shows magnetic anomalies at TN 154 K due to an antiferromagnetic transition with weak ferromagnetism and frequency-dependent anomalies near 50 K with very large temperature shifts on both the real and imaginary parts of the ac susceptibilities (43 K at 0.5 Hz and 56 K at 300 Hz on χ"). Based on the results for Bi0.9Y 0.1CrO3, we could understand some peculiarities in magnetic properties of BiCrO3. In particular, an orthorhombic modification of BiCrO3 was found to exist in the monoclinic form. We also discuss magnetic properties of BiMnO3 that shows more complicated behavior. © 2009 IOP Publishing Ltd.