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Ultrawide Temperature Range with Stable Permittivity and Low Dielectric Loss in (1 − x)[0.90Na0.5Bi0.5TiO3‐0.10BiAlO3]‐xNaNbO3 System
Advanced Electronic Materials ( IF 5.3 ) Pub Date : 2020-06-08 , DOI: 10.1002/aelm.201901429
Pengrong Ren 1 , Jiale Wang 1 , Jiaojiao He 1 , Yike Wang 1 , Hai Yuan 2 , Yun Hao 2 , Till Frömling 3 , Yuhui Wan 1 , Yonggui Shi 1 , Gaoyang Zhao 1
Affiliation  

High‐temperature capacitors have become an important research topic recently as commercially available capacitors cannot fulfill the new requirements from industry. In this work, a new ceramic ternary system (1 − x )[0.9Na0.5Bi0.5TiO3‐0.1BiAlO3]‐x NaNbO3 is introduced, and the effects of NaNbO3 concentration on macroscopic phase structure, locally disordered structure, dielectric properties, conduction properties, and energy storage properties are studied. At the optimum composition of x = 0.30, an ultrawide temperature range (−90 and 320 °C) covering both stable permittivity (Δε′/ε′25°C ≤ ± 15%) and low dielectric loss (tan δ ≤ 0.02) can be obtained. Additionally, this material has a high RC constant of 2.8 s and a high energy storage efficiency of 88% under the electric field of 60 kV cm−1 at room temperature. Therefore, this work provides a very promising candidate for dielectrics used in multilayer ceramic capacitors (MLCC) in an ultrawide operating temperature range.

中文翻译:

(1-x)[0.90Na0.5Bi0.5TiO3-0.10BiAlO3] -xNaNbO3系统中具有稳定介电常数和低介电损耗的超宽温度范围

由于商用电容器不能满足工业上的新要求,因此高温电容器最近已成为重要的研究课题。在这项工作中,引入了一种新的陶瓷三元体系(1- x)[0.9Na 0.5 Bi 0.5 TiO 3 -0.1BiAlO 3 ] -x NaNbO 3,并且NaNbO 3浓度对宏观相结构,局部无序结构,研究了介电性能,导电性能和储能性能。在x = 0.30的最佳组成下,超宽温度范围(-90和320°C)覆盖了两种稳定的介电常数(Δε'/ε'25 °C≤±15%)和低介电损耗(tanδ≤0.02)。此外,该材料在室温下在60 kV cm -1的电场下具有2.8 s的高RC常数和88%的高储能效率。因此,这项工作为超宽工作温度范围内的多层陶瓷电容器(MLCC)中使用的电介质提供了非常有希望的候选者。
更新日期:2020-07-13
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