Sm_2O_3掺杂PbTiO_3陶瓷的制备与电性能研究

Preparation and Electric Characteristics of PbTiO_3 Ceramics Doped with Sm_2O_3

采用溶胶-凝胶法制备了Sm2O3掺杂的PbTiO3陶瓷,并对其制备条件和电性能进行了研究。结果表明:Sm2O3掺杂能够缩短凝胶形成时间,降低PbTiO3陶瓷烧结温度,改善烧结性能;Sm2O3掺杂PbTiO3陶瓷的电阻率均低于纯PbTiO3陶瓷,当掺杂量为0.003(n(Sm2O3)∶n(PbTiO3))时,电阻率最低,为5.8×108Ω·m;通过XPS分析,得到了Sm2O3掺杂PbTiO3陶瓷中各元素的结合能位置,表明Sm3+、Ti4+等都存在着不同程度的变价,导致了PbTiO3陶瓷导电性的提高。

PbTiO3 ceramics doped with Sm2O3 were prepared by sol-gel method.The preparing conditions and electric characteristics of PbTiO3 ceramics were studied.The results showed that Sm2O3 doping could shorten the forming time of gel, decrease the sintering temperature and improve the sintering characteristics of PbTiO3 ceramics.The resistivity of PbTiO3 ceramics doped with Sm2O3 was lower than that of pure PbTiO3 ceramics,when Sm2O3 content was 0.003mol,the resistivity was the smallest,which was 5.8×108Ω·m.Through X-ray photoelectron spectrum,the binding energy of the elements was analyzed,which indicated that the quantivalence of Sm3+ and Ti4+ in PbTiO3 ceramics doped with Sm2O3 was variable,resulting in the improvement of the conductibility of PbTiO3 ceramics.