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Study on Electrical Properties of Tetragonal ZrO_2 Stabilized with CeO_2,CeO_2+Gd_2O_3,by AC Impedance Spectroscopy Technique

Liu Xingqin Chen Chunhua Tang Kai Meng Guangyao (Dept.of Materials Science and Eng.,University of Science and Technology of China)  
This paper reports the study on the electrical properties of tetragonal ZrO_2 po-lycrystalline ceramics by using AC impedance spectroscopy technique.The resultsshow that the conductivity of tetragonal ZrO_2 stabilized with CeO_2+Gd_2O_3 is oneorder of magnitude higher than that of stabilized with CeO_2 only and the conduc-tion activation energy is decreased by about 10%.Compared with cubic ZrO_2 stabi-lized With Y_2O_3,its conductivity value at 900℃ is about one half of the later andthe activation energy is increased by 10% or so.This research work also indicatesthat the addition of SiO_2 impurity has much influence on its conductivity and ac-tivation energy.
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