Growth and characterization of lead-free Ba_{(1鈭?span style='font-style: italic'>x)}Ca_xTi_{(1鈭?span style='font-style: italic'>y)}Zr_yO₃ single crystal

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• 作者：Yiming Zeng ; Yanqing Zheng ; ^{zyq@mail.sic.ac.cn} ; Xiaoniu Tu ; Zhiping Lu ; Erwei Shi
• 关键词：A1. Dielectric properties ; A1. Raman spectrum ; A2. Single crystal growth ; B2. BCZT
• 刊名：Journal of Crystal Growth
• 出版年：2012
• 期刊代码：49_00220248
• 类别：ch
• 出版时间：15 March, 2012
• 卷：343
• 期：1
• 页码：17-20
• 文件大小：670 K

摘要

A lead-free Ba_(1鈭?em>x)Ca_xTi_(1鈭?em>y)Zr_yO₃ (BCZT) single crystal (x=0.08, y=0.26) was grown by the Czochralski (CZ) method in a mixed flux of TiO₂ and ZrO₂. The composition of as-grown BCZT was analyzed by electron probe micro-analysis. The structure, dielectric properties and phase transition were investigated at different temperatures. The X-ray diffraction results confirmed that the structure of the as-grown BCZT crystal was cubic both at 25 掳C and 500 掳C. The temperature dependence of the dielectric constant and Raman spectra characterization revealed that there was a phase transition from cubic to tetragonal, which happened between 200 K and 250 K. With increasing frequency, the Curie temperature shifted towards high temperature.