Local structure analysis of KNbO sub(3) nanocubes by solvothermal synthesis

The atomic-scale structure of KNbO sub(3) 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 KNbO sub(3) nanocubes was rhombohedr...

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Published inJapanese Journal of Applied Physics Vol. 54; no. 10
Main Authors Yoneda, Yasuhiro, Kohara, Shinji, Nakashima, Kouichi, Nagata, Hajime, Wada, Satoshi
Format Journal Article
LanguageEnglish
Published 01.10.2015
Subjects
Atomic structure
Ceramics
Crystal structure
Diffraction
Distortion
Nanostructure
Potassium niobates
X-rays
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Summary:The atomic-scale structure of KNbO sub(3) 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 KNbO sub(3) nanocubes was rhombohedral. The rhombohedral distortion of NbO sub(6) octahedra was maintained in the nanocubes and also observed in KNbO sub(3) 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 KNbO sub(3) nanocubes was observed as a disordered phase of the rhombohedral local structure
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ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.54.10NC01