人工晶体学报2011，Vol.40Issue(3)：639-644,656,7.
MnO2掺杂对Sr1.95Ca0.05NaNb5O15无铅压电陶瓷微观结构及电学性能的影响
Effect of MnO2 Doping on the Structure and Electrical Properties of Sr1.95 Ca0.05NaNb5O15 Lead Free Piezoelectric Ceramics
摘要
Abstract
Piezoelectric ceramics Sr1.95 Ca0.05 NaNb5 O15 + y wt％ MnO2( SCNNM ) with y ranging from 0 to 1.5 were prepared by solid-state reaction method. The results indicated that the calcined SCNNM ceramics retain a single phase of tetragonal tungsten-bronze structure with y ≤ 0.7. When y ≥ 1.0, a secondary phase was observed. The addition of a little MnO2 could decrease the sintering temperature, promote grain growth. The dielectric, piezoelectric and ferroelectric properties of the SCNNM ceramics significantly increased. At room temperature, the SCNNM ceramic with y = 0.5 exhibits the optimum properties: piezoelectric coefficient d33 = 190 pC/N, mechanical quality factor Qm = 1455, planer and thickness electromechanical coupling factors Kp = 13.4％ and Kt = 36.5％, dielectric constant εr = 2123, loss tangent tanδ = 0.038, remanent polarization Pr = 4.76 μC/cm2, coercive field Ec = 12.68 kV/cm, and curie temperature Tc =260 ℃.关键词
MnO2掺杂/钨青铜结构/SCNNM/压电陶瓷Key words
MnO2 doping/ tungsten-bronze structure/ SCNNM/ piezoelectric ceramics分类
通用工业技术引用本文复制引用
范修军,王越..MnO2掺杂对Sr1.95Ca0.05NaNb5O15无铅压电陶瓷微观结构及电学性能的影响[J].人工晶体学报,2011,40(3):639-644,656,7.基金项目
北京市教委基金资助项目(JC00615200901) （JC00615200901）
