Effect of La and Cr Doping on Tunable Properties of Barium Strontium Titanate Ceramics

赵毅; 刘文凤; 靳一航; 戚润生; 李盛涛

doi:10.7652/xjtuxb202311015

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Effect of La and Cr Doping on Tunable Properties of Barium Strontium Titanate Ceramics

更新时间：2025-12-08

- Effect of La and Cr Doping on Tunable Properties of Barium Strontium Titanate Ceramics
- Vol. 57, Issue 11, Pages: 151-159(2023)
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202311015
  CLC： TB34
- Online First：10 November 2023，
  
  Published：2023
- 稿件说明：
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赵毅, 刘文凤, 靳一航, et al. Effect of La and Cr Doping on Tunable Properties of Barium Strontium Titanate Ceramics[J]. 2023, 57(11): 151-159.
DOI：

赵毅, 刘文凤, 靳一航, et al. Effect of La and Cr Doping on Tunable Properties of Barium Strontium Titanate Ceramics[J]. 2023, 57(11): 151-159. DOI： 10.7652/xjtuxb202311015.

摘要

针对可调谐微波器件对材料高介电可调性与低介电损耗的性能需求

采用传统固相烧结法

设计并制备了具有优异调谐性能的施受主复合掺杂(Ba

0.675

0.325

)

1-0.005

0.005

1-x

(x=0.3%、0.5%、0.7%、1.0%)陶瓷。引入施主杂质La取代A位元素改善介电可调性

受主杂质Cr取代B位元素降低介电损耗

并改变施主/受主掺杂比

研究了施主/受主掺杂比对钛酸锶钡(BST)陶瓷微观结构与电学性能的影响规律。实验结果表明:随着受主杂质摩尔分数的增加

晶粒尺寸先增大后减小

致密度先提升后降低

即合适的施主/受主掺杂比更有利于试样的致密化; 当Cr

的摩尔分数为0.7%时

试样的调谐性能最佳

其介电可调性为83.6%

介电损耗为0.004 1

优值因子可达到204

此时

试样的击穿场强达到14 kV/mm。研究结果可为材料在强外加电场下使用稳定性提供参考。

Abstract

To meet the requirements of tunable microwave devices for high dielectric tunability and low dielectric loss

(Ba

0.675

0.325

)

1-0.005

0.005

1-x

(x=0.3%

0.5%

0.7%

1.0%)ceramics with excellent tunable performance were designed and prepared using the conventional solid-state reaction method. Donor dopant La was added to replace Ba/Sr to improve the dielectric tunability while acceptor dopant Cr was introduced to replace Ti to reduc

e the dielectric loss. The effect of La/Cr doping ratio on the microstructure and electrical properties of BST ceramics was investigated. The experimental results showed that with an increase in the acceptor dopant content

both the grain size and relative density exhibited an initial increase followed by a subsequent decrease. It can be concluded that a suitable doping ratio could be benifited dense microstructure. The optimal tunable properties were observed at Cr

mole fraction of 0.7%

yielding a high dielectric tunability of 83.6%

a reduced dielectric loss of 0.004 1

and a figure of merit of 204. In this case

the breakdown strength reached 14 kV/mm. The research findings could provide guarantees for the working stability of materials under high applied electric field.

关键词

Keywords

references

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