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

Study on the (1-x)(Mg_(0.7)Zn_(0.3))TiO_3-x(Ca_(0.61)Nd_(0.26))TiO_3 Microwave Dielectric Ceramics

本实验研究了(1-x)(Mg0.7Zn0.3)TiO3-x(Ca0.61Nd0.26)TiO3体系陶瓷(MZCNT)的微波介电性能,通过(Ca0.61Nd0.26)TiO3协调(Mg0.7Zn0.3)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,(Ca0.61Nd0.26)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(Ca0.61Nd0.26)TiO3含量的增大,材料的介电常数增大,品质因数减小.当(Ca0.61Nd0.26)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,εr=24.3,Q.f=34000GHz,τf^-9×10-6/℃,从而达到实用要求.

The microwave dielectric properties of the（1-x）（Mg0.7Zn0.3）TiO3-x（Ca0.61Nd0.26）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（τf） of（Mg0.7Zn0.3）TiO3 by the addition of（Ca0.61Nd0.26）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（Ca0.61Nd0.26）TiO3 and evaporation of Zn resulted the decrease in density and degradation in dielectric properties.With increasing（Ca0.61Nd0.26）TiO3,the dielectric constant（εr） increased and the quality factor Q×f decreased.For practical application,0.87（Mg0.7Zn0.3）TiO3-0.13（Ca0.61Nd0.26）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（τf） of-9×10-6/℃ is proposed in this paper.