Articles
  • Enhanced temperature stability of small-permittivity Li3Mg2SbO5F2-basic microwave dielectric ceramics through Ba3(VO4)2 addition

  • Cuijin Peia, Fanfan Pana, Qianjing Jiaa, Li Quana, Miao Chena, Weihong Liub, Guoguang Yaoa,*, Wei Zhanga,*and Yansheng Wangc

  • aSchool of Science, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
    bSchool of Electronic Energineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
    cXi'an Chaofan Optoelectronic Equipment Co., LTD, Xi’an 710121, China

  • This article is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Microwave ceramics with close-zero temperature coefficient of resonance frequency (τf~0 ppm/◦C) high quality factor (Q×f>50,000 GHz), small permittivity (εr<15), and low sintering temperature (Ts<950 oC) are gaining great attention in the field of fundamental research and 5G communication. Until now, ceramics owing aforementioned key metrics at the same time is quite rare. In this paper, the (1-x)Li3Mg2SbO5F2–xBa3(VO4)2 (x=0.2–0.4) counterparts had been fabricated through high temperature solid state reaction at 750–850 oC. X-ray diffraction and SEM-EDS analyses showed all the specimens are composed of two dissimilar phases: Ba3(VO4)2 and Li3Mg2SbO5F2. The εr, τf, and Q×f of Li3Mg2SbO5F2-host counterpart upgrade with the increase of Ba3(VO4)2 content, and a near-zero τf is obtained for the specimen with x=0.3. With increment of sintering temperature, the volume density, Q×f together with εr for 0.7Li3Mg2SbO5F2–0.3Ba3(VO4)2 ceramics rose first and reduced thereafter, yet its τf remained stable. An expected εr of 11.4, τf of 4.8 ppm/oC and Q×f of 50,600 GHz were achieved at x= 0.3 constituent sintered at 825 oC.


Keywords: Composite ceramics, Li3Mg2SbO5F2 oxyfluorides, Ba3(VO4)2, Temperature stability.

This Article

  • 2026; 27(1): 67-70

    Published on Feb 28, 2026

  • 10.36410/jcpr.2026.27.1.67
  • Received on Aug 20, 2025
  • Revised on Jan 24, 2026
  • Accepted on Jan 26, 2026

Correspondence to

  • Guoguang Yao, Wei Zhang

  • School of Science, Xi’an University of Posts and Telecommunications, Xi’an 710121, China
    Tel : +86 29 88166089

  • E-mail: yaoguoguang@xupt.edu.cn, zhangweio@xiyou.edu.cn