Bismuth nickel niobate with small negative temperature coefficients of dielectric constant

2017 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF)/International Workshop on Acoustic Transduction Materials and Devices (IWATMD)/Piezoresponse Force Microscopy (PFM) Pub Date : 2017-05-01 DOI:10.1109/ISAF.2017.8000204

Xiukai Cai, Xiaobo Sun, Lufeng Pang

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引用次数: 2

Abstract

Bismuth nickel niobate was prepared by conventional solid state reaction technique. Dense ceramic body was obtained at low sintering temperatures. In Bi2O3-NiO-Nb2O5 ternary oxide system, the structure and dielectric properties of several compositions along the selected NiO:Nb2O5=1∶1 composition line, have been investigated by X-ray diffraction analyses and temperature dependences of dielectric constant and loss factor. Cubic pyrochlore, tetragonal pyrochlore, and other unknown phases occur in the concerned compositions. Small negative temperature coefficient of dielectric constant has been reported. The low temperature dielectric relaxation, common to almost all compositions, has been curve fitted according to the ε-T empirical equation of ferroelectrics. The index factor is 1.4 or so, corresponding to the ferroelectric relaxation.

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介电常数负温度系数小的铌酸铋镍

采用常规固相反应法制备铌酸铋镍。在低烧结温度下获得了致密的陶瓷体。在Bi2O3-NiO-Nb2O5三元氧化物体系中，采用x射线衍射分析和介电常数和损耗因子的温度依赖性研究了选定的NiO:Nb2O5=1∶1组成线上几种成分的结构和介电性能。立方焦绿石、四方焦绿石和其他未知相出现在有关成分中。有报道称介电常数的负温度系数很小。根据铁电体的ε-T经验方程，拟合了几乎所有化合物都有的低温介电弛豫。指数因子在1.4左右，与铁电弛豫相对应。

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来源期刊

2017 Joint IEEE International Symposium on the Applications of Ferroelectric (ISAF)/International Workshop on Acoustic Transduction Materials and Devices (IWATMD)/Piezoresponse Force Microscopy (PFM)

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