0.96(K_xNa_(1-x)NbO_3)-0.04Bi_(0.5)Na_(0.5)ZrO_3无铅压电陶瓷的性能研究  

Study on Properties of 0.96(K_xNa_(1-x)NbO_3)-0.04Bi_(0.5)Na_(0.5)ZrO_3 Lead-free Piezoelectric Ceramics

作　　者：洪璐 李月明 沈宗洋 王竹梅 洪燕 洪倩 HONG Lu;LI Yueming;SHEN Zongyang;WANG Zhumei;HONG Yan;HONG Qian(School of Materials Science and Engineering, Jingdezhen Ceramic Institute; Key Laboratory of Functional Ceramic Materials of China Light Industry; Jingdezhen 333403, Jiangxi, China)

机构地区：[1]景德镇陶瓷大学材料科学与工程学院中国轻工业功能陶瓷材料重点实验室,江西景德镇333403

出　　处：《陶瓷学报》2017年第4期490-494,共5页Journal of Ceramics

基　　金：国家自然科学基金(51262011);江西省自然科学基金(20151BAB206014);江西省教育厅科技落地计划(KJLD13076)

摘　　要：采用传统固相法制备了0.96(K_xNa_(1-x)NbO_3)-0.04Bi_(0.5)Na_(0.5)ZrO_3(0.96K_xN_(1-x)N-0.04BNZ,x=0.48,0.49,0.50,0.51,0.52)无铅压电陶瓷,系统研究了K含量对0.96K_xN_(1-x)N-0.04BNZ压电陶瓷晶相组成、显微结构及压电性能的影响规律。结果表明:0.96K_xN_(1-x)N-0.04BNZ陶瓷均具有纯钙钛矿结构,在x=0.50-0.51时为正交-四方两相共存的准同型相界组成;样品的体积密度随着烧结温度的升高先增大后减小,在1120℃下保温3 h体积密度最高,相同烧结温度下,样品的体积密度随K+含量的增加先增大后减小,并在x=0.50时,体积密度达到最大值ρ=4.56 g/cm^3;陶瓷样品的压电常数d33、机电耦合系数kp、介电常数εr等随着x值的增加呈现出先增大后减小,而陶瓷的介电损耗tanδ和机械品质因数Qm则呈现出相反的趋势。在x=0.50时,陶瓷获得优异的电性能,其d_(33)=305 pC/N;k_p=36.8%;Q_m=49;ε_r=1390;tanδ=3.2%,居里温度T_C=320℃。0.96(KxNa1-xNbO3)-0.04Bi0.5Na0.5ZrO3(0.96KxN1-xN-0.04BNZ,x=0.48,0.49,0.50,0.51,0.52)ceramics were prepared by conventionalsolid state reaction method.The crystal structure,micromorphology and electrical properties of0.96KxN1-xN-0.04BNZ piezoceramics weresystemically investigated.The results indicated that all the samples have a pure perovskite structure,and a morphortropic phase boundary(MPB)region with the coexistence of orthorhombic and tetragonal phases can be found in the composition x range of0.5-0.51.The bulkdensity of the sample first increases and then decreases with the firing temperature increasing.The highest density was achieved at1120℃for3h,the bulk density of the sample first increases and then decreases with the content of K increasing,the bulk density reaches themaximum(ρ=4.56g/cm3)at x=0.5.The piezoelectric constant d33,electromechanical coupling factor kp and the dielectric constantεr of thesamples first increases and then decreases with the increasing of x content,while the mechanical quality factor Qm and dielectric loss tanδof the ceramics show opposite trend.The optimized piezoelectric properties can be obtained for the ceramics with x=0.50composition asfollows:d33=305pC/N,kp=36.8%,Qm=49,εr=1390,tanδ=3.2%and Curie temperature TC=320℃.

关 键 词：铌酸钾钠 无铅压电陶瓷 锆酸铋钠 压电性能 

分 类 号：TQ174.75[化学工程—陶瓷工业]