摘要   采用传统陶瓷制备工艺，利用XRD、SEM等测试分析方法，研究了MnCO₃、Sb₂O₃掺杂对压电陶瓷晶体结构、表面形貌以及性能的影响。研究结果表明：所有组成均呈单一钙钛矿型固溶体特征，无其它晶相生成。掺杂陶瓷在1160℃左右烧结比较合适。MnCO₃表现为典型的“受主”添加物特征。Sb₂O₃的掺杂对陶瓷性能的影响受多种因素共同作用，当Sb₂O₃的掺杂量为0.1％（质量分数）时,d33=148pC/N、tanδ=4.2％、εr=1516。MnCO₃的掺杂可以促进晶粒生长，Sb₂O₃的掺杂使晶粒尺寸的均匀性降低。
    关键词    无铅压电陶瓷 掺杂 MnCO₃ Sb₂O₃  

Study on Mn and Sb Doped NBT-KBT-BT Lead-Free Piezoelectric Ceramics
WEI Minxian, HUANG Xinyou, GAO Chunhua, CUI Yongzhen
( School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013)

    Abstract    Lead-free piezoelectric ceramics is prepared by conventional ceramic technique. The influence of MnCO₃ and Sb₂O₃-doping on the crystal structure, surface topography and properties of ceramics are investigated by XRD, SEM and other analytic methods. It shows that all compositions show the characteristics of pure perovskite structure solid states. MnCO₃ and Sb₂O₃-doping does not change the crystal structure. MnCO3 and Sb₂O₃ doped ceramics with high comprehensive properties is obtained when sintered at 1160℃. MnCO₃ is a kind of accepter dopant. The influence of Sb₂O₃-doping on ceramic properties is acted by many factors. When the addition amount of Sb2O3 is up to 0.1wt％, the doped samples show good performances with d33=148pC/N, εr=1516 and tanδ=4.2％. MnCO₃-doping promotes the growth of crystal grain, Sb₂O₃-doping makes the grain crystal size different.  
    Keywords     lead-free piezoelectric ceramics, doping, MnCO₃, Sb₂O₃