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Free-standing, monodisperse cubic BaTiO3 colloidal nanocrystals have been prepared by a hydrothermal route at temperatures as low as 135 °C. Raman spectroscopy measurements and photoluminescence measured in the cube-like 20 nm BaTiO3 nanocrystals strongly suggest the existence of a tetrragonal distortion due to an “off-center” shift of the Ti4+ ions within the TiO6 octahedra.
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Adireddy et al. (2010) studied this question.
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