ELECTRICAL-CONDUCTION IN DY2TI2O7 SINGLE-CRYSTAL

Electrical conductivity, thermoelectric power and dielectric constant of a Dy2Ti2O7 single crystal have been studied in the temperature range 300-1000 K. Dy2Ti2O7 is found to be an n-type semiconductor with an energy band gap of 2.4 eV. The compound exhibits extrinsic nature up to 700 K and intrinsic nature above 700 K. Thermoelectric power increases with temperature in the region 300-700 K whereas it decreases with temperature in the region 700-1000 K. Dielectric constant increases with temperature in the entire temperature range studied with a discontinuity at T almost-equal-to 700 K.