掺杂Co_2O_3对Na_(0.5)Bi_(0.5)TiO_3基压电陶瓷性能的影响  

PROPERTIES OF CO-DOPED Na_(0.5)Bi_(0.5)TiO_3 LEAD-FREE PIEZOELECTRIC CERAMICS

作　　者：冯子义[1] 江向平[1] 涂娜[1] 陈超[1] 陈燕[1] 余祖灯[1] 

机构地区：[1]景德镇陶瓷学院材料工程系,景德镇333001

出　　处：《陶瓷学报》2009年第1期20-24,共5页Journal of Ceramics

基　　金：国家自然科学基金(编号:50562002;50862005);教育部新世纪优秀人才支持计划(编号:NCET-06-0576);江西省自然科学基金(编号:2008GZC0009)

摘　　要：通过固相法合成Na0.5Bi0.5TiO3+xmol%Co3(+简写为:NBT-xC)体系无铅压电陶瓷,并对其相结构、压电、介电及铁电性能进行了研究。XRD分析结果表明,所有组成均形成三方钙钛矿结构。SEM扫描电镜照片显示Co2O3的引入有利于晶粒长大,提高致密度。随着Co含量的增加,陶瓷的压电常数d33,机电耦合系数Kp都略有下降,机械品质因素Qm有明显提高,在x=3时达到极大值:Qm=934,同时介电损耗出现极小值:tgδ=0.02(1kHz),综合得出Co离子起"硬性掺杂"作用。Lead-free piezoelectric ceramics Na0.5Bi0.5TiO3＋xmol%Co3＋（abbreviated as： NBT-xC）are prepared by the solid state reaction method. Effects of the amount of Co3＋ on the phase structure and electrical properties are studied. X-ray diffraction （XRD） indicates that each composition forms a pure rhombohedral perovskite phase. Scanning electron microscope （SEM） photographs show a remarkable growth of grains and compact structures are obtained with Co3＋. doped. The doping with Co^3＋ enhances the mechanical quality factor Qm significantly, whereas the dissipation factor tgδ has a minimum value at x=3. Meanwhile, addition of Co3＋ leads to small decreases of piezoelectric constant d33 and planar electromechanical coupling kp. The composition of NBT-3C ceramics exhibit maximum mechanical mechanical quality factor Qm of 934, dissipation factor tgδ of 0.02 at lkHz. These results demonstrate that the doping of Co3＋ makes a ＂hard doping＂ effect.

关 键 词：Na0.5Bi0.5TiO3 Co2O3 压电 铁电 

分 类 号：TQ174.75[化学工程—陶瓷工业]