High-Performance Bi0.5Na0.5TiO3 Single Crystals Grown by High-Oxygen-Pressure Flux Method

概要

論文の詳細を見る
High-$P_{\text{O$_{2}$}}$ (oxygen pressure) crystal growth is developed for Bi0.5Na0.5TiO3 single crystals based on defect chemistry at high temperatures. Thermogravimetric analysis shows that the vacancy formations of Bi and O at high temperatures are controlled by the surface reaction (oxygen desorption), which is suppressed at a higher $P_{\text{O$_{2}$}}$. Bi0.5Na0.5TiO3 crystals grown at a $P_{\text{O$_{2}$}}$ of 1 MPa exhibit a saturated remanent polarization of 44 μC/cm2 along [110]cubic, suggesting a spontaneous polarization of 54 μC/cm2 along [111]cubic (polar direction) of rhombohedral Bi0.5Na0.5TiO3. High-$P_{\text{O$_{2}$}}$ heat treatments are proposed to be effective for fabricating high-quality and high-performance ferroelectric/piezoelectric devices using Bi-based ferroelectric oxides.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2008-09-25