Dielectric stability in the relaxor: Na0.5Bi0.5TiO3-Ba0.8Ca0.2TiO3-Bi(Mg0.5Ti0.5)O3- NaNbO3 ceramic system
Dielectric stability in the relaxor: Na0.5Bi0.5TiO3-Ba0.8Ca0.2TiO3-Bi(Mg0.5Ti0.5)O3- NaNbO3 ceramic system
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弛豫剂中的介电稳定性：Na0.5Bi0.5TiO3-Ba0.8Ca0.2TiO3-Bi(Mg0.5Ti0.5)O3-NaNbO3陶瓷体系
DOI：
10.1016/j.ceramint.2018.01.191
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发表时间：
2018
影响因子：
5.2
通讯作者：
Zeb A
中科院分区：
文献类型：
--
作者：
Zeb A
在0.6[0.85Na0.5Bi0.5TiO3-（0.15-x）Ba0.8Ca0.2TiO3-xBi（Mg0.5Ti0.5）O3]−0.4NaNbO3，x ≤ 0.15体系中，研制出了具有温度稳定介电特性的陶瓷。介电测量显示出弛豫铁电特性，在−70 °C - 215 °C的温度范围内，温度稳定的相对介电常数为εr~1330 ± 15%，在−20 °C至380 °C的温度范围内，x = 0组分的tanδ ≤ 0.02。对于Bi（Mg0.5Ti0.5）O3改性的组合物，稳定的相对介电常数的温度范围从−70 °C扩展到400 °C，εr约为950 ± 15%，tanδ ≤ 0.02从−70 °C到260 °C。直流电阻率值在300 °C时约为108 Ω m，相应的RC常数值在300 °C时为0.40 - 0.78 s。所有陶瓷样品在最大施加电场为5 kV/cm（1 kHz）时均表现出线性极化-电场响应。
Ceramics with temperature-stable dielectric characteristics have been developed in the system: 0.6[0.85Na0.5Bi0.5TiO3-(0.15-x)Ba0.8Ca0.2TiO3-xBi(Mg0.5Ti0.5)O3]−0.4NaNbO3, x ≤ 0.15. Dielectric measurements exhibited relaxor ferroelectric characteristics with temperature-stable relative permittivity from εr~1330 ± 15% in the temperature range from −70 °C – 215 °C and tanδ ≤ 0.02 from −20 °C to 380 °C for x = 0 compositions. For the Bi(Mg0.5Ti0.5)O3 modified compositions the temperature range of stable relative permittivity extended from −70 °C to 400 °C, with εr ~ 950 ± 15% and tanδ ≤ 0.02 from −70 °C to 260 °C. Values of dc resistivity were ~ 108 Ω m at a temperature of 300 °C and the corresponding RC constant values were in the range from 0.40 − 0.78 s at 300 °C. All ceramic samples exhibited a linear polarisation-electric field response at maximum applied electric field of 5 kV/cm (1 kHz).