Thermal and dielectric properties of gel-grown cobalt malonate dihydrate single crystals

Abstract

Single crystals of cobalt malonate dihydrate were grown in a silica gel medium by the single diffusion method. The thermal behavior of the crystals was investigated by thermogravimetric and differential thermal analyses. The dielectric constant, dielectric loss and ac conductivity of the crystals were estimated as a function of temperature in the range 40–140 °C for four different frequencies. The results indicate that the grown crystals are thermally stable up to about 150 °C and exhibit a phase transition at 130 °C.