Abstract
Bi1−xYxMnO3 (0.1≤x≤0.9) solid solutions were prepared by the high-pressure high-temperature method at 6GPa and 1573K. They crystallize in the GdFeO3-type perovskite structure with the Pnma symmetry. Crystal structures of Bi0.9Y0.1MnO3 and Bi0.5Y0.5MnO3 are studied by synchrotron X-ray powder diffraction at room temperature. Only one Néel temperature, TN, is found in samples with 0.1≤x≤0.9 in comparison with two Néel temperatures observed in YMnO3 (TN=29 and 39K). Samples with 0.5≤x≤0.9 have almost constant TN=44K, while TN starts to increase linearly for other compositions: TN=46K for x=0.3, TN=58K for x=0.2, and TN=68K for x=0.1. Field-induced transitions from canted-antiferromagnetic states to antiferromagnetic states are detected at about 30kOe for x=0.2 and 70kOe for x=0.1. Dielectric constant increases below TN in samples with 0.5≤x≤1, while it decreases below TN in samples with 0.1≤x≤0.3. Our data suggest that a magnetic structure changes near x=0.4. By extrapolation, we could estimate lattice parameters (a=5.9221Å, b=7.5738Å, and c=5.4157Å) and TN=79K for a hypothetical Pnma modification of BiMnO3.
Published Version
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