Charge transport in CaTiO₃: I. Electrical conductivity

The present paper reports the electrical conductivity of polycrystalline undoped CaTiO³ in the temperature range 973-1323K under controlled oxygen partial pressure (10-10⁵ Pa . The electrical conductivity data are considered in terms of defect disorder and related semiconducting properties of CaTiO₃. The values of the P(0₂) exponent of electrical conductivity at high 002), that vary between 1/4.3 and 1/6.2 at 973 and 1323 K, respectively, are considered in terms of theoretical defect disorder model of p-type CaTiO₃ and increasing effect of minority charge carriers (electrons) with temperature on p-type conduction. The activation energy, of the electrical conductivity, assurning 125.3 kj/mol at 10 Pa and 94.4 kj/mol at 72 kPa, has been considered in terms of the formation of defect and their mobility. The band gap, determined from the minimum of electrical conductivity corresponding to the n-p transition is equal to 2.77 eV.