层间极化修饰srla2al2o7基微波介电陶瓷的高Qf和近零τf

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-04-29 DOI:10.1016/j.jeurceramsoc.2025.117493

Caidan Hou, Zhuo Wang, Jinteng Kang, Ying Xue, Zhuang Liu, Zeyu Ning, Junke Xie, Xin Li

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引用次数: 0

摘要

通过在a位用Sr2+取代La3+，在b位用Ti4+取代Al3+，提高了SrLa₂Al₂O₇陶瓷的微波介电性能，特别是质量因子（Qf）和谐振频率温度系数（τf）。采用固相法合成了纯相Sr/Ti共取代Sr1+2xLa2−2xAl2−2xTi2xO7陶瓷。值得注意的是,在一个最佳的替代水平的x = 0.55,结果Sr2.1La0.9Al0.9Ti1.1O7陶瓷表现出优越的微波介电性能:εr = 25.94  ±0.32 ,Qf = 117300 ±5700  GHz (f0 = 6.40 GHz),τf = 3.28  ± 0.17 ppm /°C。Qf值的增大与层间极化电荷绝对值小导致层间极化效应减弱密切相关。τf值受τε和b位键价的共同支配。

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High Qf and near-zero τf of SrLa2Al2O7-based microwave dielectric ceramics modified by interlayer polarization

The microwave dielectric properties of SrLa₂Al₂O₇ ceramic, specifically the quality factor (Qf) and temperature coefficient of resonant frequency (τ_f), were enhanced through substituting La³⁺ with Sr²⁺ at the A-site and Al³⁺ with Ti⁴⁺ at the B-site. Pure-phase Sr/Ti co-substituted Sr_1+2xLa_2−2xAl_2−2xTi_2xO₇ ceramics were synthesized via solid-phase reaction route. Remarkably, at an optimal substitution level of x = 0.55, the resulting Sr_2.1La_0.9Al_0.9Ti_1.1O₇ ceramic exhibited superior microwave dielectric properties: ε_r = 25.94 ± 0.32, Qf = 117,300 ± 5700 GHz (f₀ = 6.40 GHz), τ_f = 3.28 ± 0.17 ppm/°C. The increase of Qf value was highly associated with the low interlayer polarization effect caused by the small absolute value of interlayer polarization charges. The τ_f value was jointly dominated by both τ_ε and the bond valence of B-site bonds.

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.