论文部分内容阅读
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.
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 indicates 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. slight shift in band position with increasing dopant concentration which favo rs the formation of orthorhombic modification.