固相法制备新型KNN基近红外透明陶瓷  

Preparation and Performances of KNN-based Lead-free Transparent Ceramics

作　　者：王斌科[1,2] 杜红亮[1] 徐卓[2] 

机构地区：[1]空军工程大学理学院,陕西西安710051 [2]西安交通大学电子材料与器件教育部重点实验室,陕西西安710049

出　　处：《空军工程大学学报（自然科学版）》2013年第3期87-90,共4页Journal of Air Force Engineering University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(10976022;50632030);陕西省自然科学基金资助项目(2011JM6012)

摘　　要：采用传统固相烧结工艺,注重烧结时的气氛控制,制备了铌酸钾钠(KNN)基无铅透明陶瓷xBa(Sc0.5Nb0.5)O3-(1-x)(K0.5N0.5)NbO3。并对其相结钩、微观结构、压电性能和透光率进行了研究。结果表明:该体系陶瓷具有准立方钙钛矿结构,没有其他杂相,晶粒大小与可见光波长相当,高度致密,无明显的晶界存在。在x=0.05时,d33最高可达到110pC/N。同时该材料具有良好的透明性,在可见光范围内,透过率达到47%左右,近红外2 500nm处,透过率接近70%,是一种有望取代铅基透明陶瓷的环境友好型无铅透明陶瓷。Using conventional solid-phase sintering technique combined with a special atmosphere control-ling technique, KNN-based lead-free transparent ceramics, x Ba（Sc0.5 Nb0.5）O3-（1-x） （K0.5N0.5）NbO3 （xBSN-（1-x） KNN in simplified form）, are prepared and investigated. The XRD, micro-structure, die-lectric performance and optical transparency are investigated. The results show that such ceramics are of pseudocubic-Perovskite structure without any other impure phase. The grain size is comparable to the light wavelength and the grains are highly condensed without evident crystal borders. When x=0.05, d33 can reach up to 110 pC/N maximally. Such ceramics are of excellent transparency and the optical transparency reaches about 47 % in the visible light range,and the optical transparency is near 70 % at the near-infrared wavelength 2 500 nm. Such ceramics are a type of environment-friendly lead-free transparent ceramics which is promising in replacing lead-based transoarent ceramics.

关 键 词：铌酸钾钠(KNN) 无铅透明陶瓷 透过率 晶界 

分 类 号：TN384[电子电信—物理电子学]