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Local Structure Analysis of KNbO<sub>3</sub> Nanocrystals with Cubic Shape
摘要： KNbO3 nanocrystals were grown by solvothermal technique assisted by a microwave treatment. The morphology of nanocrystals is a cubic shape and the crystal structure is also cubic system. This is an ideal case for the so-called Sherrer's equation. We performed high-energy X-ray scattering to extract various structural parameters. The particle size can be evaluated by the Sherrer's equation. The unit cell size of the KNbO3 nanocrystals was reduced as the particle size increased. The local structure of the nanocrystals was found to be a rhombohedral structure similar to that of the bulk KNbO3. Although the periodic structure of the perovskite system unchanged locally, the first-nearest neighbor and the second-nearest neighbor bond distances corresponding to Nb-O and K-O was changed as the particle size increased.
关键词： nanocrystals,local structure,KNbO3,atomic pair-distribution function
更新于2025-09-10 09:29:36
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Nanometer-scale local structural study of the paraelectric cubic phase of KNbO <sub/>3</sub> by convergent-beam electron diffraction
摘要： Nanometer-scale local structures of the paraelectric cubic phase of potassium niobate (KNbO3) are examined by convergent-beam electron diffraction (CBED) using a nanometer-size electron probe. The breaking of the cubic symmetry has been directly observed in the nanometer-scale areas of the cubic phase of KNbO3. This indicates the existence of local polarization clusters in the cubic phase. Symmetry breaking index maps for the fourfold rotation symmetry are given at different temperatures with the combined use of scanning transmission electron microscopy (STEM) and CBED (STEM–CBED). ? 2017 The Japan Society of Applied Physics
关键词： local polarization clusters,CBED,convergent-beam electron diffraction,STEM,KNbO3,symmetry breaking
更新于2025-09-09 09:28:46