摘要
The electrical conductivity of pure CaTiO3 and that containing 0.5～5.0 mole fraction CuO as dopant were measured in the temperature range 291～773 K. The conductivity values varied as a function of temperature and dopant concentration. The activation energy in the lower temperature range depended on the impurity content while in the high temperature range it indicated a value of energy gap width. The infrared absorption spectra in the range of 100～4000 cm-1revealed the presence of two main bands at 340 and 570 cm-1 which were assigned to TiO6 octahedral normal mode. Bands in the range of 106～270 cm-1 were due to the vibration of anion TiO-2. Some bands were observed at higher values due to the presence of lattice imperfections.There was a slight shift in band position with increasing dopant concentration which favors the formation of orthorhombic modification.
The electrical conductivity of pure CaTiO3 and that containing 0.5~5.0 mole fraction CuO as dopant were measured in the temperature range 291~773 K. The conductivity values varied as a function of temperature and dopant concentration. The activation energy in the lower temper- ature range depended on the impurity content while in the high temperature range it indicated a value of energy gap width. The infrared absorption spectra in the range of 100~4000 cm-1 revealed the presence of two main bands at 340 and 570 cm-1 which were assigned to Ti06 oc- tahedral normal mode. Bands in the range of 106~270 cm-1 were due to the vibration of anion TiO3-2. Some bands were observed at higher values due to the presence of lattice imperfections. There was a slight shift in band position with increasing dopant concentration which favors the formation of orthorhombic modification.
