The dielectric properties, lattice parameters, and X‐ray and neutron diffraction intensities of solid solutions of BaTiO 3 containing Nb or Ta were studied. These solid solutions have a perovskite‐type structure with part of the Ti 4+ ions replaced by Nb 5+ or Ta 6+ ions and with some cation vacancies. These solid solutions exhibit a remarkable lowering of the Curie point, but the tetragonal‐orthorhombic and the orthorhombic‐rhombohedral transition points are raised.
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Subbarao et al. (1959) studied this question.
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