Bi_4Ti_3O_(12)掺杂对(Bi_(1.5)Zn_(0.5))(Zn_(0.5)Nb_(1.5))O_7陶瓷结构与介电性能的影响

Effect of Bi_4Ti_3O_(12) addition on microstructure and dielectric properties of (Bi_(1.5)Zn_(0.5))(Zn_(0.5)Nb_(1.5))O_7 ceramics

研究了Bi4Ti3O12掺杂对(Bi1.5Zn0.5)(Zn0.5Nb1.5)O7(BZN)陶瓷烧结特性、相结构和介电性能的影响。采用传统的固相反应法制备样品,X射线衍射技术分析相结构,SEM观察表面形貌。结果表明,Bi4Ti3O12掺杂能有效地促进烧结,提高介电常数ε,降低介电损耗tgδ,优化介电频率温度系数αε。1000℃烧结8%(摩尔分数)Bi4Ti3O12掺杂的BZN陶瓷具有较好的介电性能:ε=192,tgδ=4.21×10-4,αε=-3.37×10-4/℃。

The effect of Bi4Ti3O12 addition on the sintering characteristic, microstructure and dielectric properties of （Bi1.5Zn0.5）（Zn0.5Nb1.5）O7 （BZN） ceramics was investigated. The samples were prepared by conventional ceramic processing technology. X-ray diffraction technique was used to analyze phase structure and SEM was used to observe the microstructure. The experimental results indicate that Bi4Ti3O12 addition can accelerate the densification rate of the material,improve the dielectric constant evalue of BZN ceramics, decrease the dielectric loss tgδ and optimize the dielectric coefficient of resonant frequency αε. The 8mol%-Bi4Ti3O12-doped BZN ceramics sintered at 1000℃ have the optimum dielectric properties：ε=192, tgδ=4.21×10^-4 and αε=-3.37×10^-4/℃.