【摘要】 对0.95PbTiO₃—0.02PbCeO₃—0.03PbNb₂O₆固溶体陶电铁瓷进行了不同掺MnO₂量（由0到1.5摩尔百分比）的系列试验;测量了该系列材料的室温介电行为、铁电滞后迴线、热释电系数以及机电耦合系数.X 时线分析表明,全部材料均不出现第二相;在掺MnO₂量为0.3和0.5摩尔百分比处,热释电系数与机电耦合系数k_t 分别出现最大值;用钙钛矿型铁电体的电晶各向异性理论模型和空间电荷效应解释了介电性的实验结果.更多还原

【Abstract】 Ferroelectric ceramics consisting of 0.95PbTiO₃-0.02PbCeO₃-0.03PbNb₂O₆ so-lid solution with various quantities of Mn-doping have been investigated.TheMn-doping quantities vary from 0 mole % to 1.5 mole%.X-ray analysis showsthat there is no second-phase in these ceramics.Dielectric behaviours,ferroelec-tric hysteresis loops,pyroelectric coefficient and piezoelectric thickness cou-pling factor of the ceramic series have been measured at room temperature.Themaximum values of the pyroelectric coefficient and the coupling factor are at the0.3 mole % and 0.5 mole % of Mn-doping quantities respectively.An explaina-tion has been given by the theory of the electric-crystal anisotropy model ofthe perovskite ferroelectrics and the space charge effect.更多还原