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Single crystals of Na0.5Bi0.5TiO3 were investigated by optical birefringence microscopy as a function of temperature. Evidence of a temperature-driven rotation of the axis of the optical indicatrix within a monoclinic plane was obtained.

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Lithium tantalate crystals with varying Li2O content have been produced by vapour transport equilibration and show the formation of wedge-shaped domains for compositions where the birefringence is close to zero. Measurements of the birefringence coupled with Raman scattering experiments have enabled precise determination of Li2O concentration.
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