抄録
The electrical conduction mechanism for defect-perovskite LaTa3O9 was studied by D.C. polarization technique. The linear log (σdc) vs (time)-1/2 relationship was observed, which means that diffusion process could be dominant for the electrical conduction. Total stored charges increased with increasing temperature depending on oxygen partial pressure (PO2). Asymmetrical polarization measurements showed that the polarity of the electrode affected to the time dependence of σdc and leakage currents. The relationship between D.C. voltage and the leakage currents suggested that dominant electronic charges might change from electrons to holes with increasing temperature and PO2.
