Pr，Mn多元渗对BaTiO_3陶瓷结构与电性能的影响  

Effect of Gaseous Penetration of Pr,Mn into BaTiO_3 Ceramics on Structure and Electrical Properties

作　　者：郝素娥[1] 黄金祥[1] 张巨生[1] 王进福[1] 刘志刚[1] 

机构地区：[1]哈尔滨工业大学应用化学系,哈尔滨150001

出　　处：《无机材料学报》2007年第5期816-820,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(20571020)

摘　　要：采用溶胶-凝胶法制备了纯BaTiO_3、Pr,Mn液相掺杂及气相多元扩渗改性的BaTiO_3陶瓷.研究结果表明,Pr掺杂能使纯BaTiO_3陶瓷的室温电阻率下降为1.01×10~5Ω·m;而Mn掺杂使室温电阻率升高为1.50×10^(13)Ω·m.但Pr和Mn的气相扩渗都能降低BaTiO_3陶瓷的室温电阻率至1.08×10~3Ω·m和1.29×10~5Ω·m.Pr-Mn共渗BaTiO_3陶瓷出现了典型的NTC效应.XRD分析表明,Pr或Mn掺杂并不能改变BaTiO_a陶瓷的物相结构,但经Pr-Mn共渗后,出现了新化合物BaMn_(0.12)Al_(1.88)O_4和Al_8Mn_4Pr的特征峰.XPS分析表明,气相多元渗使Pr,Mn,C元素都扩渗到陶瓷体内,并使各化学元素之间的结合更加牢固.SEM测试结果表明,Pr,Mn气相扩渗使陶瓷表面明显改观,晶粒生长完整,粒度分布均匀,气孔率下降.Pure BaTiO3 ceramics and Pr, Mn-doped BaTiO3 ceramics were prepared by a sol-gel method. The pure BaTiO3 ceramics were modified by the penetration of Pr and Mn in gaseous state, their structure and electrical properties were studied. The results show that the resisitivity of Pr-doped BaTiO3 ceramics is decreased to 1.01 × 105^2.m, the resisitivity of Mn-doped BaTiO3 ceramics is increased to 1.50×10^13Ωm, while both Pr and Mn penetration can decrease the resisitivity of BaTiO3 ceramics evidently, which is 1.0^8× 10^3Ωm and 1.29× 10^5Ωm, respectively . The Pr-Mn penetrated BaTiO3 ceramics show a distinct NTC effect. The XRD results show that the perovskite structure of Pr or Mn doped BaTiO3 ceramics does not change obviously, but there are new peaks of BaMno.12All.8804 and A18Mn4Pr in Pr-Mn penetrated BaTiO3 ceramics. The XPS results show that Pr, Mn and C element are penetrated into BaTiO3 ceramics, leading to the binding energy of modified BaTiO3 ceramics increase and their stability improve. The SEM results show that Pr and Mn penetration can improve the surface state of BaTiO3 ceramics, the grains become finer and grow more integrally than pure BaTiO3 ceramics, the porosity are decreased visibly.

关 键 词：钛酸钡 稀土 气相扩渗 NTC效应 

分 类 号：O614[理学—无机化学]