Ba(Zn_(0.5)W_(0.5))O_3掺杂对Ba[(Zn_(0.2)Co_(0.8))_(0.33)Nb_(0.66)]O_3微波介质陶瓷的影响  

Effect of Ba(Zn_(0.5)W_(0.5))O_3 on microstructure and microwave dielectric properties of Ba[(Zn_(0.2)Co_(0.8))_(0.33)Nb_(0.66)]O_3 ceramics

作　　者：赵飞[1] 岳振星[1] 张迎春[2] 桂治轮[1] 李龙土[1] 

机构地区：[1]清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室,北京100084 [2]黑龙江科技学院材料科学与工程系,哈尔滨150027

出　　处：《黑龙江科技学院学报》2005年第2期72-74,82,共4页Journal of Heilongjiang Institute of Science and Technology

基　　金：国家863计划资助(2001AA325100);国家重大基础研究计划(973项目)资助(2002CB613307)

摘　　要：用传统固相法制备了Ba(Zn0.5W0.5)O3掺杂Ba[(Zn0.2Co0.8)0.33Nb0.66]O3微波介质陶瓷,通过XRD和HP8720ES网络分析仪分别对其晶体结构和微波介电性能进行了研究。实验结果表明,少量的Ba(Zn0.5W0.5)O3可以把体系的烧结温度从1430℃降低到1380℃,促进了烧结。在烧结过程中Zn的挥发会促使掺入的Ba(Zn0.5W0.5)O3转变成BaWO4,以第二相的形式存在于陶瓷样品表面,而内部并没有明显的第二相生成。这说明烧结过程中Zn的扩散很有限。在微波介电性能方面,随着Ba(Zn0.5W0.5)O3的掺杂量的增加,Ba[(Zn0.2Co0.8)0.33Nb0.66]O3的相对介电常数(εr)略有减小,谐振频率的温度系数(τf)略有增大,而其Q×f值则在测量误差范围内波动不大,说明掺入少量的Ba(Zn0.5W0.5)O3对Ba[(Zn0.2Co0.8)0.33Nb0.66]O3在微波频率下的品质因数影响不大。Ba(Zn0.5W0.5)O3 doped Ba[(Zn0.2Co0.8)0.33Nb0.66]O3 microwave dielectric ceramics were prepared by traditional ceramics process in this paper. The crystal structure and microwave dielectric properties of Ba(Zn0.5W0.5)O3 and Ba(Zn0.5W0.5)O3 doped Ba[(Zn0.2Co0.8)0.33Nb0.66]O3 ceramics were investigated by XRD and an HP8720ES network analyzer. The results show that the less amount of Ba(Zn0.5W0.5)O3 addition can improve the sinterability of Ba[(Zn0.2Co0.8)0.33Nb0.66]O3 ceramics, and lower the sintering temperature of the ceramics from 1 430 ℃ to 1 380 ℃. Due to the volatilization of zinc, Ba(Zn0.5W0.5)O3 transformed into BaWO4, as a secondary phase on the surface of the samples. No secondary phase was observed in the inner of the samples, which implies that the volatilization of znic happened only on the surface of the samples. With the increase of Ba(Zn0.5W0.5)O3 doping, the dielectric constant of the ceramics slightly decreased whereas the temperature coefficient of resonant frequency increased. The Q×f values were not significant changed.

关 键 词：XRD 微波陶瓷 钙钛矿 介电性能 

分 类 号：TB383[一般工业技术—材料科学与工程]