铋基无铅压电陶瓷Bi_(0.5)(Na_(0.82)K_(0.18))_(0.5)TiO_3-BiCrO_3的微观组织与电性能  

Microstructure and electrical properties of Bi-based lead-free piezoelectric ceramics Bi_(0.5)(Na_(0.82)K_(0.18))_(0.5)TiO_3-BiCrO_3

作　　者：周昌荣[1] 刘心宇[1] 杨桂华[2] 袁昌来[1] 江民红[1] 

机构地区：[1]桂林电子科技大学广西信息材料重点实验室,桂林541004 [2]桂林工学院电子与计算机系,桂林541004

出　　处：《中国有色金属学报》2009年第7期1289-1293,共5页The Chinese Journal of Nonferrous Metals

基　　金：广西自然科学基金资助项目(0447092);广西信息材料重点实验室主任基金资助项目(桂科能0710908-02-Z)

摘　　要：采用传统陶瓷制备方法,制备一种新型无铅压电陶瓷(1-x)Bi0.5(Na0.82K0.18)0.5TiO3-xBiCrO3(BNKT-BCx)。研究Bi基铁电体BiCrO3对BNKT-BCx陶瓷晶体结构和压电介电性能的影响。结果表明:在所研究的组成范围内,陶瓷材料的主体结构为纯钙钛矿固溶体,微量BiCrO3(x=0～0.02,摩尔分数)不改变陶瓷的晶体结构;当BiCrO3含量x>0.02时,晶体结构由三方、四方共存转变为伪立方结构,并出现明显的第二相;当x=0.015时,d33=168pC/N;当x=0.01时,kp=0.32,为该体系压电性能的最大值;随BiCrO3含量的增加,陶瓷的低温介电反常峰向低温移动,高温介电反常峰向高温移动,反铁电相区域增加,弥散指数增加。A new （Bi0.5Na0.5）TiO3-based lead-free piezoelectric ceramics, （1-x）Bi0.5（Nao.82K0.18）0.5TiO3-xBiCrO3 （BNKT-BCx）, was prepared by a conventional ceramic sintering technique. The effect of Bi-based ferroelectrics of BiCrO3 on the crystal structure, dielectric and piezoelectric properties was investigated. X-ray diffraction patterns indicate that trace BiCrO3 addition（x=0-0.02） causes insignificant change in crystal structure, and an obvious secondary phase is observed in the samples with x〉0.02. The piezoelectric constant d33 and the electromechanical coupling factor kp of the ceramics attain maximum values of 168 pC/N and 0.32 near morphotropic phase boundary （MPB） that co-existence between rhombohedral and tetragonal. With increasing BiCrO3 content, the antiferroelectric phase zone gets broader and the diffuse coefficient increases.

关 键 词：钛酸铋钠 无铅压电陶瓷 压电性能 钙钛矿结构 

分 类 号：TM282[一般工业技术—材料科学与工程]