Abstract
The atomic-scale structure of KNbO3 nanocubes synthesized by a solvothermal method has been studied using high-energy X-ray diffraction, Rietveld refinement, and the atomic pair-distribution function (PDF) technique. It was found that the local structure of KNbO3 nanocubes was rhombohedral. The rhombohedral distortion of NbO6 octahedra was maintained in the nanocubes and also observed in KNbO3 bulk ceramics. The size effect on the crystallographic structure can be understood as analogous to the temperature-driven and/or pressure-driven structural phase transitions. The tetragonal average structure of the KNbO3 nanocubes was observed as a disordered phase of the rhombohedral local structure.
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