Ultrawide Temperature Range with Stable Permittivity and Low Dielectric Loss in (1 − x)[0.90Na0.5Bi0.5TiO3‐0.10BiAlO3]‐xNaNbO3 System,Advanced Electronic Materials

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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

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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 )[0.9Na_0.5Bi_0.5TiO₃‐0.1BiAlO₃]‐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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