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 tim...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.展开更多
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).
文摘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.
