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Temperature Stable Dielectric Properties in BaTiO3–Bi(Mg2/3Nb1/3)O3–NaNbO3 Solid Solution
ChemistrySelect ( IF 1.9 ) Pub Date : 2020-03-26 , DOI: 10.1002/slct.202000243
Raz Muhammad 1 , Asif Ali 1 , Javier Camargo 2 , Miriam S. Castro 2
Affiliation  

0.5BaTiO3–(0.5–x)Bi(Mg2/3Nb1/3)O3xNaNbO3 (x=0.1, 0.2 and 0.3) samples were processed via solid‐state sintering route. Phase identification of the samples showed the formation of a single‐phase cubic perovskite‐structure (space group Pm‐3 m) which was further confirmed using Raman spectroscopy. Microstructural analysis of the samples revealed some voids in the samples while grain size was observed to decrease with increasing NaNbO3 concentration. The addition of NaNbO3 shifted Tm to below room temperature and the stability range of 0.5BaTiO3–0.5Bi(Mg2/3Nb1/3)O3 ceramics was enhanced. The sample with x=0.20 exhibited ϵr(mid) = 400 ±15% stable over a wide temperature range from −85 to 500 °C and most importantly a low dielectric loss of < 0.05 stable across a wide temperature range −100 to 426 °C was maintained. The thermally stable dielectric properties of sample x=0.2 suggests that it could be useful candidate material for capacitor applications in both low (X9R) as well as harsh environment applications.

中文翻译:

BaTiO3-Bi(Mg2 / 3Nb1 / 3)O3-NaNbO3固溶体中的温度稳定介电性能

通过固态烧结工艺处理了0.5BaTiO 3 –(0.5– x)Bi(Mg 2/3 Nb 1/3)O 3x NaNbO 3x = 0.1、0.2和0.3)样品。样品的相进行鉴定显示出单相立方钙钛矿结构的形成(空间群PM -3 ),将其使用拉曼光谱进一步证实。样品的微结构分析显示出样品中存在一些空隙,而观察到的晶粒尺寸随NaNbO 3浓度的增加而减小。NaNbO 3的添加改变了T m到室温以下,增强了0.5BaTiO 3 –0.5Bi(Mg 2/3 Nb 1/3)O 3陶瓷的稳定性范围。x = 0.20的样品在−85至500°C的宽温度范围内表现出ϵ r(mid) = 400±15%的稳定性,最重要的是,在−100至426的宽温度范围内,介电损耗<0.05维持℃。样品x = 0.2的热稳定介电性能表明,它可能是在低(X9R)以及恶劣环境应用中电容器应用的有用候选材料。
更新日期:2020-03-27
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