REFINEMENT OF THE THERMODYNAMIC FUNCTIONS OF ZIRCONOLITE AT HIGH TEMPERATURES

摘要

To calculate the thermodynamic functions of crystalline zirconolite CaZrTi_2O_7 up to 1800 K and its melt up to 3000 K, we used the results of measurements of the heat capacity in the interval 20-400 K. These results were extrapolated up to 1500 K using the equation C_p : 3R[mD(θ_D/T) + nE(θ_ET)] + (C_p - C_v), where D(θ_D/T) and E(θ_EIT) are the Debye and Einstein functions and C_p - C_v is the component of the heat capacity due to thermal expansion of crystalline zirconolite.