(1-x)(Mg0.9Co0.1)TiO3-x(Ca0.61La0.26)TiO3陶瓷的微波介电性能

doi:10.3724/SP.J.1077.2011.11060

无机材料学报 ›› 2011, Vol. 26 ›› Issue (6): 664-668.DOI: 10.3724/SP.J.1077.2011.11060 CSTR: 32189.14.SP.J.1077.2011.11060

(1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃陶瓷的微波介电性能

刘昊, 沈春英, 卢正东, 丘泰

(南京工业大学材料科学与工程学院, 南京210009)

收稿日期:2010-01-18 修回日期:2011-03-02 出版日期:2011-06-20 网络出版日期:2011-06-07

Microwave Dielectric Properties of the (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃ Ceramics

LIU Hao, SHEN Chun-Ying, LU Zheng-Dong, QIU Tai

(College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China)

Received:2010-01-18 Revised:2011-03-02 Published:2011-06-20 Online:2011-06-07
About author:LIU Hao(1987-), male, candidate of master. E-mail: kyleliu@sohu.com

摘要/Abstract

摘要： 研究了(1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃(MCT-CLT)体系陶瓷的微波介电性能. 目的是通过(Ca_0.61La_0.26)TiO₃ (CLT)协调(Mg_0.9Co_0.1)TiO₃(MCT)陶瓷的谐振频率温度系数. 实验发现, 烧结温度和陶瓷组成对微波介电性能影响显著, 当烧结温度为1300℃时, 可以获得良好的致密度, 当烧结温度超过1300℃时, 陶瓷致密度和介电性能下降. 此外, 随着CLT含量的增加, 材料的介电常数增大, 品质因数减小. 当CLT含量为13%, 烧结温度为1300℃, 保温2h, (MCCLT)陶瓷具有优良微波介电性能, ε_r =22.4, Q×f =35000 GHz, τ_f = -8.7×10^-6/℃, 从而达到实用要求.

关键词: (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃陶瓷, 微波介质陶瓷, 介电常数, 品质因数, 谐振频率温度系数

Abstract: The microwave dielectric properties of the (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃(MCT-CLT) ceramics were investigated. The system was prepared using a conventional solid-state ceramic route. The objective of the present work is to compensate for the negative temperature coefficient of resonant frequency (τ_f) of (Mg_0.9Co_0.1)TiO₃ (MCT) by the addition of (Ca_0.61La_0.26)TiO₃ (CLT). The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. Very dense MCT-CLT ceramics were prepared by sintering at 1300℃. When the ceramics were sintered at temperatures above 1300℃, the bulk density decreased and the dielectric properties deteriorated. With the increasing of x, the relative dielectric constant (ε_r) of the ceramics increases and the product of quality factor and resonant frequency (Q×f) decreases. For practical application, 0.87(Mg_0.9Co_0.1)TiO₃- 0.13(Ca_0.61La_0.26)TiO₃ (87MCT-13CLT) ceramics sintered at 1300℃ with a dielectric constant ε_r=22.4, a Q×f value of 35000 GHz and a temperature coefficient of resonance frequency (τ_f) of -8.7×10^-6/℃ was proposed in this paper.

Key words: (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃ ceramics, microwave dielectric ceramics, dielectric constant, quality factor, temperature stable resonant frequency

中图分类号:

TQ174

刘昊, 沈春英, 卢正东, 丘泰. (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃陶瓷的微波介电性能[J]. 无机材料学报, 2011, 26(6): 664-668.

LIU Hao, SHEN Chun-Ying, LU Zheng-Dong, QIU Tai. Microwave Dielectric Properties of the (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃ Ceramics[J]. Journal of Inorganic Materials, 2011, 26(6): 664-668.

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(1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃陶瓷的微波介电性能

Microwave Dielectric Properties of the (1-x)(Mg_0.9Co_0.1)TiO₃-x(Ca_0.61La_0.26)TiO₃ Ceramics

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