Structural study of heat-treated BaTiO3–KNbO3 nanocomposites with heteroepitaxial interface by synchrotron radiation powder diffraction
Structural study of heat-treated BaTiO3–KNbO3 nanocomposites with heteroepitaxial interface by synchrotron radiation powder diffraction
复制标题
同步辐射粉末衍射法研究具有异质外延界面的热处理 BaTiO3-KNbO3 纳米复合材料的结构
DOI：
10.2109/jcersj2.121.602
复制
发表时间：
2013
影响因子：
1.1
通讯作者：
S. Wada
中科院分区：
文献类型：
--
作者：
E. Magome;Y. Kuroiwa;C. Moriyoshi;I. Fujii;K. Nakashima;N. Kumada;S. Wada
KNbO 3 (KN) / BaTiO 3 (BT) 纳米复合陶瓷，其中BT纳米粒子通过异质外延界面薄薄地涂覆有KN晶体，在1000℃下热处理10h，并通过同步辐射粉末衍射研究晶体结构。基于多组分模型的Rietveld分析表明，通过热处理，BT的逐渐扭曲的四方组分的体积显着减小，并且BT-KN固溶体出现在纳米复合材料中。与合成纳米复合材料相比，热处理纳米复合材料中压电响应的抑制归因于晶体结构的这些变化。提出了陶瓷晶粒的核/多壳结构模型，并揭示了晶体结构的变化是由BT和KN之间的异质外延界面回弹引起的。
KNbO 3 (KN) / BaTiO 3 (BT) nanocomposite ceramics, in which a BT nanoparticle is thinly coated with KN crystals through the heteroepitaxial interface, are heat-treated at 1000°C for 10h, and the crystal structures are investigated by synchrotron radiation powder diffraction. The Rietveld analysis based on the multicomponent models reveals that the volumes of gradually distorted tetragonal components of BTare signi fi cantly decreased and the BT-KN solid solutions emerge in the nanocomposites by the heat-treatment. The suppression of the piezoelectric response in the heat-treated nanocomposites compared with the as-synthesized ones is attributed to these changes in the crystal structure. The core / multishell structure model for the ceramic grain is proposed, and the changes in the crystal structure are revealed to be caused at the heteroepitaxial interface regain between BT and KN.