不同方法制备BiNbO_4微波陶瓷的研究  

Studies on BiNbO_4 Microwave Ceramics Prepared by Different Synthesis Methods

作　　者：徐清华[1] 杨同青[1] 乔宏伟[1] 沈波[1] 丁士华[1] 姚熹[1] 

机构地区：[1]同济大学功能材料研究所,上海200092

出　　处：《压电与声光》2007年第2期190-192,共3页Piezoelectrics & Acoustooptics

基　　金：国家"九七三"基金资助项目(2002CB613302)

摘　　要：研究了固相反应法和熔盐法两种制备方法对BiNbO4微波陶瓷的烧结温度、微观形貌、结构和介电性能的影响。实验表明:在添加CuO和V2O5分别为0.1%(质量分数)时,固相反应法在较低的烧结温度下可获得较致密的陶瓷样品,样品表面晶粒呈球状,品质因数与谐振频率的乘积即Q×f值较大,谐振频率温度系数为正值;熔盐法制得的陶瓷样品具有明显的各向异性,晶粒呈棒状,谐振频率温度系数随烧结温度的升高由正值向负值变化,在940℃烧结,介电常数为38,Q×f值为7781 GHz,谐振频率温度系数近零,为0.92×10-6/℃。两种方法制得的陶瓷样品在微波频段介电常数相近。Sintering temperature, microstructure and properties of BiNbO4 microwave ceramics prepared by molten salt synthesis and solid reaction synthesis were studied. The microstructure of powder and ceramics prepared by solid reaction synthesis looks like balls, while those prepared by molten salt synthesis looks like bars. All samples have the same structure of orthorhombic phase, but there is some different in intensity of XRD. The higher value of Q× f was obtained by the method of solid reaction synthesis, while the temperature coefficient of resonance frequency （τf） was smaller for the method of molten salt synthesis. For the sample sintered at 940 ℃ by molten salt synthesis, the value of Q×f is 7 781 GHz, and the value of τf is 0.92 10^-6/℃, which is near zero.

关 键 词：BiNbO4微波陶瓷 熔盐法 固相反应法 介电性能 

分 类 号：TM283[一般工业技术—材料科学与工程]