摘要
采用Zn^(2+)对0.85MgTiO_3-0.15Ca_(0.6)La_(0.8/3)TiO_3陶瓷进行A位取代,研究了Zn^(2+)取代对其结构与性能的影响规律。实验结果表明:少量Zn^(2+)的取代没有改变陶瓷的物相组成,扫描电子显微镜图显示Zn的取代可以促进陶瓷晶粒生长,使陶瓷的密度变大,介电常数有所提高,但由于在高温下Zn元素的挥发使得体系中生成了更多的A位离子空位,使得该材料损耗变大。谐振频率温度系数向负方向变大,由+2.1×10^(-6)/℃变化为-2.3×10^(-6)/℃。
The A-site substitution of 0.85MgTiO_3-0.15Ca_(0.6)La_(0.8/3)TiO_3 ceramics by Zn^(2+)ion,and the effects of Zn substitution on microwave properties were studied.The results showed that the Zn substitution did not change the phase composition of the ceramic,but made the ceramic denser and dielectric constant higher.The volatilization of Zn at high temperature made the system generating more A-site cation vacancies,which decreased the properties of the ceramics.The micro morphology showed that the grain enlarged with the amount of Zn substitution,which reduced the porosity of the ceramic.The temperature coefficient of resonance frequency became negative.It varied from +2.1×10^(-6)/℃to-2.3×10^(-6)/℃。
出处
《真空电子技术》
2016年第5期37-40,共4页
Vacuum Electronics
关键词
微波介质陶瓷
取代
介电性能
Microwave dielectric ceramic
Substitution
Dielectric properties
