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We report on the dielectric properties of bismuth aluminate and gallate with Bi:Al(Ga) ratio of 1:1 and 12:1 prepared at high temperature and ambient pressure. These compounds crystallize in a noncentrosymmetric body-centered cubic structure (space group I23) with a∼10.18Å rather than in the perovskite structure. This cubic phase is related to the γ-Bi2O3 structure which has the actual chemical formula...
Investigation of polycrystalline samples synthesized at high pressures as well as thin films deposited by nebulized spray pyrolysis suggest that BiMnO 3 is ferromagnetic with a T C of 105K and ferroelectric with a Curie temperature of around 450K. It remains ferroelectric down to low temperatures through the ferromagnetic transition.
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