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V5+取代对 Mg4(SbNb1-xVx)O9陶瓷介电性能的影响

姚国光1, 刘鹏2   

  1. 1. 西安邮电学院应用数理系, 西安 710121; 2. 陕西师范大学物理与信息技术学院, 西安 710062
  • 收稿日期:2007-12-03 修回日期:2008-01-18 出版日期:2008-09-20 网络出版日期:2008-09-20

Effects of V5+ Substitution on the Dielectric Properties of Mg(SbNb1-xV xO9 Ceramics

YAO Guo-Guang1, LIU Peng2   

  1. 1. Department of Applied Mathematics and Physics, Xian Institute of Posts and Telecommunications, Xi’an 710021, China; 2. College of Physics and Information Technology, Shaanxi Normal University, Xi'an 710062, China
  • Received:2007-12-03 Revised:2008-01-18 Published:2008-09-20 Online:2008-09-20

摘要: 研究了不同V5+含量Mg4(SbNb1-xVx)O9[MSNV, 0.05≤ x≤0.3]系陶瓷的烧结特性、微观结构和微波介电性能. 结果表明: 一定量V5+取代能够明显降低该陶瓷的烧结温度. 在所有组成范围内, XRD显示了单一刚玉型结构. 随V5+含量的增加, 样品的介电常数ε和品质因数Q·f先增大后减小, 样品的谐振频率温度系数τf逐渐减小, 这是由于V5+的取代使得B位键价增强所致. 在x=0.15, 1250℃烧结, 可获得εr=9.98, Q·f=20248GHz (8GHz), τf=-23.3×10-6·K-1的新型微波介质陶瓷.

关键词: 微波介质陶瓷, Mg4(SbNb1-xVx)O9, 介电性能

Abstract: The effects of V5+ substitution on the sintering characters, microstructure and microwave dielectric properties of Mg4(SbNb1-xVxO9 ceramics were investigated. Results show that a small amount of V5+ substitution for Nb5+ can lower the sintering temperature of Mg4(Nb2-xSbx)O9 drastically. In all composition range investigated, the sintered ceramics show single phase with corundum structure. With increasing of V5+ content, the dielectric constant (ε) and quality factor (Q·f) increase and thereafter decrease, respectively, the temperature coefficient of resonant frequencies τ f decreases which is due to the strengthened B site-bond valence caused by V5+ substitution. The ceramics with x=0.15 sintered at 1250℃ has a relative dielectric constant εr of 9.98, a quality factor Q·f value of 20248GHz (at 8GHz) and a temperature coefficient of resonant frequencies τ f value of --23.3×10-6K-1.

Key words: microwave dielectric ceramics, Mg4(SbNb1-xVx)O9, dielectric properties

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