CeO2掺杂KNN-LiNbO3无铅压电陶瓷的压电与介电性能研究

采用传统固相烧结法制备了0.98K0.5Na0.5NbO3-0.02LiNbO3-xCeO2(0.98KNN-0.02LN+xCeO2)无铅压电陶瓷.研究了不同CeO2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CeO2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.CeO2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CeO2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=104pC/N,Qm=2201,kp=0.24423,εr=804.2,tanδ=8.748;.

Piezoelectrical and Dielectrical Properties of CeO2 Doped KNN-LiNbO3 Based Lead-free Piezoceramics

Ternary system piezoelectric ceramic materiais 0.98K0.5 Na0.5 NbO3-0.02LiNbO3 -xCeO2 (0. 98KNN-0.02LN+xCeO2 ) 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 0.98K0.5 Na0.5 NbO3-0.02LiNbO3 lead-free piezoelectric ceramics doped with CeO 2 were investigated.The crystal structure of the ceramics changes from orthorhombic phase to tetragonal phase when content of CeO 2 change from x =0.00 to x =0.01 and x =0.02 to x =0.04, and the coexistence of orthorhombic-tetragonal phases are observed when x=0.00 and x=0.02.The results show that when adding a small amount of CeO 2 , it show the characteristics of the acceptor doping and when adding amount of CeO 2 , 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 pC/N, Qm =2201, kp =0.24423,εr =804.2, tanδ=8.748%.