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Polycrystalline CaMn 1 - x Nb x O 3 compounds ( x = 0.1, 0.2, 0.3) were synthesized by a solid reaction. CaMn 1 - x Nb x O 3 crystallizes in an orthorhombic GdFeO 3 -type structure. The Nd doping causes the increases of the lattice parameters, unit cell volume, the average Mn−O bond distance, and Mn−O−Mn bond angle. CaMn 1 - x Nb x O 3 compounds show magnetic phase inhomogeneity. With increasing the Nb concentration, CaMn 1 - x Nb x O 3 compounds exhibit ferromagnetic, metamagnetic, antiferromagnetic, and paramagnetic characterizations, respectively. And their magnetizations significantly reduce. CaMn 1 - x Nb x O 3 compounds are insulators in the temperature range from 5 to 400 K, and their resistivities enhance with increasing Nb content. A huge asymmetry resistivity hysteresis loop is observed for the CaMn 0.9 Nb 0.1 O 3 compound at low temperature; however, this resistivity loop is melting with increasing the applied field and temperature and tends to disappear near the Curie temperature. This phenomenon might be due to the Nb doping inducing a low-temperature magneto-electric phase separation between the ferromagnetic metallic and the charge-ordering antiferromagnetic insulating phases.
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Guo et al. (2005) studied this question.
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