摘要
采用传统的固相合成法制备ZnNb2O6与TiO2摩尔比为1∶x系统微波陶瓷,借助XRD、SEM和LCR测试仪,研究了TiO2添加对ZnNb2O6陶瓷的烧结特性、相组成结构及介电性能。结果表明,随着TiO2含量的增加,晶相结构变得复杂化,TiO2掺杂质量分数x<0.4时,只有ZnNb2O6晶相;0.6<x<1.4时,存在ZnNb2TiO8、Zn0.17Nb0.33Ti0.5O2和Zn0.15Nb0.3Ti0.55O2三相;1.6<x<2.0时,由ZnNb2TiO8和TiO2两相组成。同时,随着相结构的变化,陶瓷的介电常数εr增加,品质因数Q值先减小后增大,频率温度系数τf向正方向移动。在1 200℃烧结(x=1.8)的陶瓷具有较佳的微波性能:εr=51,Q×f=11 187GHz,τf=―8μ℃-1。
The microwave dielectric ceramics ZnNb2O, dropped TiO2 can be prepared by traditional solid-phase synthesis, the sinterability, the phase composition and the dielectric properties of the ceramics with different levels TiO2 are investigated in this paper with the XRD and SEM analytical instruments and LCR testing analyzer. The results show that： the crystalline structure becomes complicated with TiO2 concentration increases, For the concentration of TiO2 （x〈0.4）, there is only ZnNh2O6 crystalline phase; with the amount of TiO2 （0.6〈x〈1. 4） increasing, the existence phase such as ZnNb2 TiO8, Zn0.17 Nb0. 33 Ti0.5O2 and Zn0. 15 Nbo0 3 Ti0. 55 O2 is formed in the crystal structure and with the amount of TiO2 future increasing （1.6〈x〈2.0）, the ceramics has ZnNb2TiO8 and TiO2 two phases. At the same time as the phase structure changes with the increases of ceramic ετ, the Q first decreases and then increases, and τf turns to the positive direction. The dielectric ceramics sintered at 1 200 ℃ （x=1. 8） has the better dielectric properties： ετ=51 ,Q×f=11 187 GHz,τf-=- 8μ ℃^-1
出处
《压电与声光》
CSCD
北大核心
2012年第6期902-904,共3页
Piezoelectrics & Acoustooptics
作者简介
秦登静（1987-），男，四川省达县人，硕士生，主要从事多层结构微波陶瓷的研究。
