The abnormal sensitivity and its mechanism of (Ba, Pb)TiO_(3) semiconductor ceramics  

作　　者：TIANYuming XUMingxia HUANGPing ELei HAOHuzai CUICai'e 

机构地区：[1]KeyLaboratoryforAdvancedCeramicsandMachiningTechnologyofMinistryofEducation,TianjinUniversity,Tianjin300072,China//CollegeofScience,TaiyuanUniversityofTechnology,Taiyuan030024,China [2]KeyLaboratoryforAdvancedCeramicsandMachiningTechnologyofMinistryofEducation,TianjinUniversity,Tianjin300072,China [3]CollegeofScience,TaiyuanUniversityofTechnology,Taiyuan030024,China

出　　处：《Chinese Science Bulletin》2005年第9期936-939,共4页

基　　金：This work was supported by the Key Problems Foundation of Shanxi Province(Grant No.021121);Youth Founda-tion of Taiyuan University of Technology(Grant No.190-12901073).

摘　　要：The resistance-temperature properties of po- rous (Ba, Pb)TiO3 semiconductor ceramic were systemati- cally studied. It was found that the resistance of (Ba, Pb)TiO3 ceramic having been placed in the air for a long time was abnormally increased with the increase of the temperature from the room temperature to 70℃ prior to the Curie point. Further research showed that this abnormal resis- tance-temperature property was linked to its humidity sensi- tivity. When the relative humidity changed from 11% to 93%, the resistance of (Ba, Pb)TiO3 ceramic decreased three orders of magnitude. Furthermore, the humidity-resistance was approximately linear in single logarithm coordinate. According to the surface adsorption, grain-boundary poten- tial barrier and ferroelectric-paraelectric phase transforma- tion, the specific sensitive mechanism of (Ba, Pb)TiO3 ce- ramic was analyzed qualitatively.The resistance-temperature properties of porous (Ba, Pb)TiO3 semiconductor ceramic were systematically studied. It was found that the resistance of (Ba, Pb)TiO3 ceramic having been placed in the air for a long time was abnormally increased with the increase of the temperature from the room temperature to 70 degrees C prior to the Curie point. Further research showed that this abnormal resistance-temperature property was linked to its humidity sensitivity. When the relative humidity changed from 11% to 93%, the resistance of (Ba, Pb)TiO3 ceramic decreased three orders of magnitude. Furthermore, the humidity-resistance was approximately linear in single logarithm coordinate. According to the surface adsorption, grain-boundary potential barrier and ferroelectric-paraelectric phase transformation, the specific sensitive mechanism of (Ba, Pb)TiO3 ceramic was analyzed qualitatively.

关 键 词：Ti03 半导体陶瓷 灵敏度 表面吸附 铁电物质 

分 类 号：TN3[电子电信—物理电子学]