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<p>Paraelectric U2J dielectrics have great potential for use in power electronics. In this work, fabrication and dielectric properties of U2J dielectrics based on (1-x)Sr<sub>0.75</sub>Bi<sub>0.167</sub>TiO<sub>3</sub>-x(Sr<sub>y</sub>Ca<sub>1-y</sub>)ZrO<sub>3</sub> ceramics system were investigated. The impurity phase exists in (1-x)Sr<sub>0.75</sub>Bi<sub>0.167</sub>TiO<sub>3</sub>-xCaZrO<sub>3</sub> for <i>x</i> = 0.2–0.5. The content of impurity phase decreases in 0.5Sr<sub>0.75</sub>Bi<sub>0.167</sub>TiO<sub>3</sub>-0.5(Sr<sub>y</sub>Ca<sub>1-y</sub>)ZrO<sub>3</sub> with increasing Sr content. The optimized dielectric properties are obtained at <i>x</i> = 0.5 and <i>y</i> = 0.2, and the ceramics satisfies U2J dielectric requirements (τ<sub>ε</sub> = −&#xa0;683&#xa0;ppm&#xa0;°C<sup>−1</sup>) together with high dielectric constant (124.5) and low dielectric loss (&lt; 0.001). The modified temperature coefficient for the present samples is due to the rattling effect of A-site ion for the smaller A-site bond valence. With the addition of Li<sub>2</sub>CO<sub>3</sub> and MnCO<sub>3</sub>, the sintering temperature for dense ceramic is reduced from 1350 to 1240&#xa0;°C and nonreducible characteristics are obtained when sintering in N<sub>2</sub> atmosphere. The present ceramic has potential application for Cu electrode U2J dielectric if the sintering temperature can be lowered further. </p>

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Fabrication and dielectric properties of U2J dielectrics based on (Sr,Ca)ZrO3- Sr0.75Bi0.167TiO3 ceramics

  • 期刊论文

  • 发表日期：

    2025年7月17日

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  • Xing Hu,
  • JunLi Lv,
  • Chao Kang,
  • MinKai Zhu,
  • Yi Li,
  • ZhiYuan Ling

摘要

Paraelectric U2J dielectrics have great potential for use in power electronics. In this work, fabrication and dielectric properties of U2J dielectrics based on (1-x)Sr0.75Bi0.167TiO3-x(SryCa1-y)ZrO3 ceramics system were investigated. The impurity phase exists in (1-x)Sr0.75Bi0.167TiO3-xCaZrO3 for x = 0.2–0.5. The content of impurity phase decreases in 0.5Sr0.75Bi0.167TiO3-0.5(SryCa1-y)ZrO3 with increasing Sr content. The optimized dielectric properties are obtained at x = 0.5 and y = 0.2, and the ceramics satisfies U2J dielectric requirements (τε = − 683 ppm °C−1) together with high dielectric constant (124.5) and low dielectric loss (< 0.001). The modified temperature coefficient for the present samples is due to the rattling effect of A-site ion for the smaller A-site bond valence. With the addition of Li2CO3 and MnCO3, the sintering temperature for dense ceramic is reduced from 1350 to 1240 °C and nonreducible characteristics are obtained when sintering in N2 atmosphere. The present ceramic has potential application for Cu electrode U2J dielectric if the sintering temperature can be lowered further.