High Dielectric Constant and Low-loss Dielectric Ceramies of Sr5LnTi3Ta7O3o (Ln= La,Nd, Sm and Y) |
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作者姓名: | TU Wenmao CHEN Pu PENG Xiyang LIU Ting |
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作者单位: | TU Wenmao(School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China) ;
CHEN Pu(School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China) ;
PENG Xiyang(School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China) ;
LIU Ting(School of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan 430070, China) ; |
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摘 要: | Polycrystalline Sr5LnTi3Ta7O30 (Ln=La, Nd, Sm and Y) ceramics were prepared as single-phase materials through conventional solid-state ceramics method. The structure was characterized by X-ray diffraction method and scanning electron microscopy (SEM). The dielectric properties were measured from room temperature to 400℃. All compounds are paraelectric phases adopting the filled tetragonal tungsten bronze (TB) structure at room temperature. At 1 MHz their dielectric constant (ετ) varied from 109 to 139, dielectric loss changed from 0.003 3 to 0.005 8, and the temperature coefficients of the dielectric constant (τε) moved from -710 to -880×10^-6℃^-1.
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关 键 词: | 介电陶瓷 介电性能 钨 铜 钽酸盐 介电常数 |
收稿时间: | 28 November 2007 |
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