Abstract
Crystal structures of solid solutions of BiMn 1− x Sc x O 3 with x=0.05, 0.1, 0.2, 0.3, 0.4, 0.5, and 0.7 were studied with synchrotron X-ray powder diffraction. The strong Jahn–Teller distortion, observed in BiMnO 3 at 300 K and associated with orbital order, disappeared already in BiMn 0.95Sc 0.05O 3. The orbital-ordered phase did not appear in BiMn 0.95Sc 0.05O 3 down to 90 K. Almost the same octahedral distortions were observed in BiMn 1− x Sc x O 3 with 0.05⩽ x⩽0.7 at room temperature and in BiMnO 3 at 550 K above the orbital ordering temperature T OO=473 K. These results allowed us to conclude that the remaining octahedral distortions observed in BiMnO 3 above T OO are the structural feature originated from the highly distorted monoclinic structure.
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