Effect of Two-Step Sintering Method on Tunable and Breakdown Properties of Barium Strontium Titanate Ceramics

RAN Dongsheng; LIU Wenfeng; ZHAO Yi; LIANG Yan; LI Shengtao

doi:10.7652/xjtuxb202510017

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Effect of Two-Step Sintering Method on Tunable and Breakdown Properties of Barium Strontium Titanate Ceramics

更新时间：2025-09-28

- Effect of Two-Step Sintering Method on Tunable and Breakdown Properties of Barium Strontium Titanate Ceramics
- Journal of Xi'an Jiaotong University Vol. 59, Issue 10, Pages: 180-188(2025)
- 作者机构：
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202510017
  CLC： TB34
- Received：09 April 2025，
  
  Published：10 October 2025
- 稿件说明：
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RAN Dongsheng, LIU Wenfeng, ZHAO Yi, et al. Effect of Two-Step Sintering Method on Tunable and Breakdown Properties of Barium Strontium Titanate Ceramics[J]. Journal of Xi'an Jiaotong University, 2025, 59(10): 180-188.
DOI：

RAN Dongsheng, LIU Wenfeng, ZHAO Yi, et al. Effect of Two-Step Sintering Method on Tunable and Breakdown Properties of Barium Strontium Titanate Ceramics[J]. Journal of Xi'an Jiaotong University, 2025, 59(10): 180-188. DOI： 10.7652/xjtuxb202510017.

摘要

为了满足新一代电子调谐器件对高介电调谐性能、优温度稳定性与强击穿性能的迫切需求，用钛酸锶钡（BST）作为基体，复合掺杂La、Mn，制备（Ba

0.675

0.325

）

，其中La、Mn摩尔比分别为0.25%、0.5%、0.75%和1.0%，实现兼具高介电可调度与低介电损耗。采用两步烧结法，通过优化烧结参数获得了粒径分布更均匀、微观结构更细密的陶瓷试样。实验结果表明：相较于传统的固相烧结法，采用两步烧结法制备的BST陶瓷具有更小且更均匀的晶粒尺寸和更高的致密度；在介电调谐性能方面，当La/Mn摩尔比均为0.5%时，采用两步烧结法制备的BST陶瓷具有72.7%的介电可调度、0.0011的介电损耗，计算的优值因子为661，达到最高值，相较于固相烧结法的473提升了近40%，介电可调度在温度-10～60℃范围内的相对标准偏差为0.29，相较于固相烧结法，降低了约20%；击穿场强从118.06kV/cm升至140.19kV/cm，提高了18.7%。两步烧结法协同提升了BST陶瓷的优值因子与击穿场强，满足了新一代电子调谐器件对温度稳定性的新需求，使BST材料在电子调谐器件领域更具发展潜力。

Abstract

To meet the urgent demand of next-generation electronic tuning devices for high dielectric tunability

superior temperature stability

and strong breakdown performance

barium strontium titanate (BST) is selected as the matrix and co-doped with La and Mn to form (Ba

0.675

0.325

)

where the La and Mn contents are 0.25%

0.5%

0.75%

and 1.0%

aiming to achieve both high dielectric tunability and low dielectric loss. By employing the two-step sintering method and optimizing sintering parameters

ceramic samples with more uniform grain size distribution and denser microstructure are obtained. Experimental results show that compared with the conventional solid-phase sintering method

BST ceramics prepared via the two-step sintering method exhibit smaller and more uniform grain si

zes as well as higher density. In terms of dielectric tuning performance

when the La and Mn contents are both 0.5%

the BST ceramics prepared by the two-step sintering method demonstrate a dielectric tunability of 72.7%

a dielectric loss of 0.0011

and a calculated figure of merit (FOM) reaching a maximum of 661

nearly 40% higher than the 473 achieved by the solid-phase sintering method. The relative standard deviation of dielectric tunability in the temperature range of-10 ℃ to 60 ℃ is 0.29

approximately 20% lower than that of the solid-phase sintering method. Additionally

the breakdown field strength increases from 118.06kV/cm to 140.19kV/cm

an improvement of 18.7%.The experimental results indicate that the two-step sintering method synergistically enhances both the FOM and breakdown field strength of BST ceramics

meeting the new requirements of temperature stability for next-generation electronic tuning devices and further advancing the potential of BST materials in the electronic tuning device field.

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