Abstract
Cubic and orthorhombic KNbO3 have been synthesized under hydrothermal conditions respectively by tuning impurities and alkali concentration in initial reaction compositions, and characterized by X-ray diffraction, Laser Raman, Infrared and X-ray photoelectronic spectroscopies. Phase transitions of resulting niobates induced by pressure at high temperatures were investigated in comparison with hydrothermal pressure effect. Mechanisms of stabilization of cubic KNbO3 were discussed.
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