铌酸钾钠基无铅透明陶瓷制备及性能  

Preparation and performances of KNN-based lead-free transparent ceramics

作　　者：王斌科[1,2] 田晓霞[2] 徐卓[1] 屈绍波[2] 李振荣[1] 

机构地区：[1]西安交通大学电子材料研究所,西安710049 [2]空军工程大学理学院,西安710051

出　　处：《物理学报》2012年第19期464-468,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10976022;50632030);陕西省自然科学基金(批准号:2011JM6012)资助的课题~~

摘　　要：采用传统固相烧结工艺,结合特殊的气氛控制技术,制备了铌酸钾钠(KNN)基无铅透明陶瓷XBa(Sc_(0.5)Nb_(0.5))O_3-(1—x)(K_(0.5)N_(0.5))NbO_3(简写xBSN-(1-x)KNN).并对其微观结构、介电、铁电性能和光学透光率进行了研究.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,d_(33)最高可达到110 pC/N,2P_r达到25.4μC/cm^2.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54%左右,近红外2500 nm处,透过率接近83%,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 controlling technique, KNN-based lead- free transparent ceramics, xBa（Sc0.5Nb0.5）O3-（1 - x） （K0.5N0.5）NbO3 （xBSN-（1 - x） KNN）, are prepared and investigated. Their microstructure, dielectric performance, ferroelectric performance and optical transparency are investigated. The results show that such ceramics are each with a pseudocubic-Perovskite structure, without any other impure phase. Their grain size is comparable to the light wavelength and the grains are highly condensed without evident crystal borders. For x = 0.05, the d33 reaches up to 110 pC/N maximally and the 2Px=25.4 μC/cm2. Moreover, such ceramics are each with an excellent transparency. Their optical transparency reaches about 54%, In the near-infrared wavelength 2500 nm, their optical transparency is near 83%. Such ceramics are a type of environment-friendly lead-free transparent ceramics which may be promising in replacing lead-based transparent ceramics.

关 键 词：铌酸钾钠 无铅透明陶瓷 透过率 晶界 

分 类 号：TQ174.1[化学工程—陶瓷工业]