CeO_2掺杂KNN-LiNbO_3无铅压电陶瓷的压电与介电性能研究  

Piezoelectrical and Dielectrical Properties of CeO_2 Doped KNN-LiNbO_3 Based Lead-free Piezoceramics

作　　者：李震宇[1] 甘国友[1] 徐腾威 郭根生[1] 杜景红[1] 张家敏[1] 严继康[1] 易健宏[1] 

机构地区：[1]昆明理工大学材料科学与工程学院云南省新材料制备与加工重点实验室昆明市稀贵及有色金属先进材料重点实验室,昆明650039

出　　处：《人工晶体学报》2017年第9期1767-1772,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51262017);稀贵金属先进材料协同创新基金(14051708);稀贵金属综合利用新技术国家重点实验室开放基金(SKL-SPM-201502)

摘　　要：采用传统固相烧结法制备了0. 98K_(0. 5)Na_(0. 5)NbO_3-0. 02 Li NbO_3-x CeO_2(0.98KNN-0.02LN+x CeO_2)无铅压电陶瓷。研究了不同CeO_2掺杂含量(x=0、0.01、0.02、0.03、0.04)对0.98KNN-0.02LN陶瓷显微结构和电学性能的影响。研究结果表明:当CeO_2掺杂含量从x=0.00到x=0.01和从x=0.02到x=0.03时,样品出现了正交-四方相转变。当x=0.00和x=0.02时,样品都处于正交与四方两相共存状态。CeO_2少量掺杂时Ce4+完全进入晶格,表现为"受主"掺杂的特性;而大量CeO_2掺杂时,有杂相的生成,主要起到烧结助剂的作用。样品在1080℃下烧结,当掺杂含量为x=0.02时取得最佳的综合性能:d33=104 p C/N,Qm=2201,kp=0.24423,εr=804.2,tanδ=8.748%。Ternary system piezoelectric ceramic materiais 0. 98K（0. 5）Na（0. 5）NbO3-0. 02 Li NbO3-x CeO2（ 0.98KNN-0. 02 LN ＋ x CeO2） were fabricated using solid state sintered technology. The effects of additive contents ranging from 0. 00 to 4mol% on structural characteristics and electrical properties of 0. 98K（0. 5）Na（0. 5）NbO3-0. 02 Li NbO3lead-free piezoelectric ceramics doped with CeO2 were investigated. The crystal structure of the ceramics changes from orthorhombic phase to tetragonal phase when content of CeO2 change from x = 0. 00 to x = 0. 01 and x = 0. 02 to x = 0. 04,and the coexistence of orthorhombictetragonal phases are observed when x = 0. 00 and x = 0. 02. The results show that when adding a small amount of CeO2,it show the characteristics of the acceptor doping and when adding amount of CeO2,results show the characteristics of the sintering additives. The optimization comprehensive property was at the addition of 2mol% CeO2 sinter temperature 1080 ℃. The main parameters for the composition of x =0. 02 are： d33= 104 p C/N,Qm= 2201,kp= 0. 24423,εr= 804. 2,tanδ = 8. 748%.

关 键 词：铌酸钾钠 掺杂改性 无铅压电陶瓷 烧结助剂 

分 类 号：TQ174[化学工程—陶瓷工业]