Gaseous Penetration of Sm into BaTiO<,3>: Mn<,0.006>Sm<,x>Ceramics and Their NTC Effect
BaTiO<,3>: Mn<,0.006>Sm<,x>(x=0. 001, 0. 002, 0. 003, 0. 004, 0. 006 respectively) ceramics were prepared by using sol-gel method and their resistivities at different temperatures were measured. The results showed that Mn element may enhance the PTC characteristics of BaTiO<,3> ceramics. But the doped Mn element deteriorated the room temperature resistivities of the modified BaTiO<,3> ceramics which were greater than 10<5>Ω·m. Then, rare earth element Sm was penetrated into BaTiO<,3>: Mn <,0.006>Sm<,x> ceramics in gaseous state, which largely decreased the room temperature resistivity to 3.20 Ω·m, and appeared as a NTC effect instead of PTC effect. The forming mechanism of NTC effect was explored through analyses of SEM and electric properties of Sm-penetrated BaTiO<,3>: Mn<,0.006>Sm<,x> ceramics.
BaTiO<,3> Sm-Mn co-doping gaseous penetration NTC effect rare earths
Hao Sue(郝素娥) Huang Jinxiang(黄金祥) Sun Liang(孙亮)
Department of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China Department of Applied Chemistry, Harbin Institute of Technology,Harbin 150001, China
国际会议
第五届国际稀土开发与应用研讨会(The Fifth International Conference on Rare Earth Decelopment and Applicatin)
包头
英文
497-500
2007-08-07（万方平台首次上网日期，不代表论文的发表时间）