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新铌酸盐Ba5NdTi3Nb7O30的合成与介电性能
引用本文: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.
作者姓名:方亮  张辉  鄢俊兵  杨卫明
作者单位:武汉理工大学材料复合新技术国家重点实验室,武汉,430070
基金项目:国家自然科学基金资助项目(No.50002007),教育部重大项目及国际衍射数据中心(ICDD)Grant-in-Aid基金资助项目(No.01-40)。
摘    要: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.

关 键 词:新铌酸盐  钨青铜结构  介电特性  X射线衍射
修稿时间:2002年6月5日

Synthesis and Dielectric Properties of a New Niobate Ba5NdTi3Nb7O30
FANG Liang,ZHANG Hui,YAN Jun-Bin and YANG Wei-Ming.Synthesis and Dielectric Properties of a New Niobate Ba5NdTi3Nb7O30[J].Chinese Journal of Inorganic Chemistry,2002,18(11):1131-1134.
Authors:FANG Liang  ZHANG Hui  YAN Jun-Bin and YANG Wei-Ming
Institution:State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070,State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070,State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 and State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070
Abstract:
Keywords:niobate  tungsten bronze structure  XRD  dielectric property
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