(1-x)(Mg0.7Zn0.3)TiO3－x(Ca0.61Nd0.26)TiO3系微波介质陶瓷介电性能研究

doi:10.3724/SP.J.1077.2009.09527

摘要/Abstract

摘要： 本实验研究了(1-x)(Mg_0.7Zn_0.3)TiO₃－x(Ca_0.61Nd_0.26)TiO₃体系陶瓷(MZCNT)的微波介电性能,通过(Ca_0.61Nd_0.26)TiO₃协调(Mg_0.7Zn_0.3)TiO₃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1250℃时，可以获得良好的致密度，当烧结温度超过1300℃时，(Ca_0.61Nd_0.26)TiO₃ 的分解和Zn的蒸发导致陶瓷致密度和介电性能下降.此外，随着(Ca_0.61Nd_0.26)TiO₃含量的增大，材料的介电常数增大，品质因数减小.当 (Ca_0.61Nd_0.26)TiO₃含量为13%，烧结温度为1250℃，保温4h，（MZCNT）陶瓷具有优良微波介电性能，ε_r =24.3，Q·f=34000GHz，τ_f~-9×10^-6/℃，从而达到实用要求.

关键词: (1-x)(Mg_0.7Zn_0.3)TiO₃－x(Ca_0.61Nd_, 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_0.7Zn_0.3)TiO₃－x(Ca_0.61Nd_0.26)TiO₃(MZCNT) system 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_0.7Zn_0.3)TiO₃ by the addition of (Ca_0.61Nd_0.26)TiO₃. The microwave dielectric properties are strongly correlated with the sintering temperature and the composition. Very dense MZCNT ceramics were synthesized by sintering at 1250℃, when sintered at temperatures above 1300℃, the decomposition of (Ca_0.61Nd_0.26)TiO₃ and evaporation of Zn resulted the decrease in density and degradation in dielectric properties. With increasing (Ca_0.61Nd_0.26)TiO₃, the dielectric constant (ε_r) increased and the quality factor Q×f decreased. For practical application, 0.87(Mg_0.7Zn_0.3)TiO₃－0.13(Ca_0.61Nd_0.26)TiO₃ ceramics sintered at 1250℃ with a dielectric constant εr～24.3, a Q×f value of 34000GHz and a temperature coefficient of resonance frequency (τ_f) of -9×10^-6/℃ is proposed in this paper.

Key words: (1-x)(Mg_0.7Zn_0.3)TiO₃－x(Ca_0.61Nd_, dielectric constant, quality factor, temperature stable resonant frequency

中图分类号:

TQ174

卢正东,沈春英,李亮,杨建,丘泰. (1-x)(Mg_0.7Zn_0.3)TiO₃－x(Ca_0.61Nd_0.26)TiO₃系微波介质陶瓷介电性能研究[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2009.09527.

LU Zheng-Dong,SHEN Chun-Ying,LI Liang，YANG Jian,QIU Tai. Study on the (1-x)(Mg_0.7Zn_0.3)TiO₃－x(Ca_0.61Nd_0.26)TiO₃ Microwave Dielectric Ceramics[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2009.09527.

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(1-x)(Mg_0.7Zn_0.3)TiO₃－x(Ca_0.61Nd_0.26)TiO₃系微波介质陶瓷介电性能研究

Study on the (1-x)(Mg_0.7Zn_0.3)TiO₃－x(Ca_0.61Nd_0.26)TiO₃ Microwave Dielectric Ceramics

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