Abstract
Perovskite and pyrochlore KTaO 3 were selectively synthesized in mixed solvents (water–ethanol and water–hexane systems) by solvothermal reaction with KOH, whose concentration was one order of magnitude lower than that in traditional methods. The samples were characterized by X-ray diffraction and transmission electron microscopy. Results show that the ratio of inert solvents (ethanol or hexane) to active solvent (water) played a significant role in the manipulation of the crystalline behavior of KTaO 3 to the form pyrochlore or perovskite nanocrystals. The possible mechanisms of the reactions are also discussed.
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