摘要
采用传统的无压固相烧结法工艺制备微量掺杂0.2%(摩尔分数)BiMnO3(BM)的0.95K0.5Na0.5NbO3(KNN)-0.05 LiSbO3(LS)陶瓷,并研究烧结保温时间对陶瓷的结构与压电、介电性能的影响规律。研究结果表明,随烧结保温时间的延长,陶瓷的压电常数d33和机电耦合系数kp先显著升高,当保温时间为7 h时,趋于稳定,介电常数εr也随保温时间的延长而升高;机械品质因数Qm和介电损耗tanδ则一直降低。在1 100℃保温烧结9 h时,陶瓷具有最好的电性能:压电常数d33=228 pC/N,机电耦合系数kp=43%,机械品质因数Qm=55,介电损耗tanδ=0.017 8;随保温时间的延长,陶瓷的相转变温度θo-t有所降低,居里温度θc则明显升高。所有陶瓷样品在35～200℃内的介电损耗tanδ均有小于0.02。
Lead-free 0.2%（mole fraction） BiMnO3（BM）-doped 0.95 K0.5Na0.5NbO3（KNN）-0.05 LiSbO3（LS） piezoelectric ceramics were prepared by a traditional ceramic processing.The effects of holding time on the microstructure,phase transition and piezoelectric properties of BM doped KNN-LS ceramics were investigated.The results show that all specimens exhibit a pure perovskite structure.The piezoelectric properties of the ceramics show a strong holding-time dependent behavior.The d33,kp and εr of the ceramics increase,while the tanδ and Qm decreases with the increase of the holding time.When the holding time is 7 h,d33 and kp of the ceramics remain unchanged with the increase of the holding time.The 0.2%（mole fraction） BM doped 0.95 KNN-0.05LS ceramics sintered at 1 100 ℃ for 9 h exhibit excellent properties（d33=228 pC/N,kp=43%,Qm=55 and tan δ=0.017 8）.With the increase of the holding time,the phase transformation temperature of the ceramics decreases,while the Curie temperature increases.The tan δ of all the samples is lower than 0.02 at 35～200 ℃。
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2010年第5期1791-1795,共5页
Journal of Central South University:Science and Technology
基金
广西省教育厅科研项目(200807LX121)
广西信息材料重点实验室主任基金资助项目(桂科能0710908-09-Z及0710908-15-Z)
广西信息材料创新人才基金资助项目(LD08014B)
