| 新铌酸盐Ba5NdTi3Nb7O30的合成与介电性能 |
| Synthesis and Dielectric Properties of a New Niobate Ba5NdTi3Nb7O30 |
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| 摘要: |
| 关键词: 新铌酸盐 钨青铜结构 介电特性 X射线衍射 |
| 基金项目: |
| Abstract: The New Niobate Ba5NdTi3Nb7O30 was synthesized by solid state reaction at 1250℃ for 48h. The crystal structure and dielectric properties of Ba5NdTi3Nb7O30 were determined by X-ray powder diffraction and dielectric measurements. The results show that Ba5NdTi3Nb7O30 belongs to ferroelectric phase of tetragonal tungsten bronze structure at room temperature with unit cell parameters: a=1.24424(4)nm, c=0.39476(2)nm, calculated density 5.719g·cm-3. Ba5NdTi3Nb7O30 belongs to relaxor ferroelectrics. The phase transition temperature (Tc) of Ba5NdTi3Nb7O30 from ferroelectric to paraelectric is found to shift toward higher temperature side at higher fre-quency, and Tc is 90℃ at 1kHz. At room temperature, the dielectric constant (εr) and dielectric loss of Ba5NdTi3Nb7O30 decrease with the increase of frequency, and Ba5NdTi3Nb7O30 ceramic have high dielectric constant 489 at 1kHz. |
| Keywords: niobate tungsten bronze structure XRD dielectric property |
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| 方亮,张辉,鄢俊兵,杨卫明.新铌酸盐Ba5NdTi3Nb7O30的合成与介电性能[J].无机化学学报,2002,18(11):1131-1134. |
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