화학공학소재연구정보센터
Thermochimica Acta, Vol.400, No.1-2, 121-129, 2003
Heat capacity of copper hydride
The heat capacity of copper hydride has been measured in the temperature range 2-60 and 60-250 K using two adiabatic calorimeters. Special procedure for the purification of CuH has been applied and a careful analysis of sample contamination has been performed. The experimental results have been extrapolated up to 300 K due to instability of the copper hydride at room temperature. From the temperature dependence of heat capacity the values of entropy S(7), thermal part of enthalpy Hdegrees(7) - Hdegrees(0) and Gibbs function [-(Gdegrees(7) -Hdegrees(0))] have been calculated assuming Sdegrees(0) = 0. The standard absolute entropy, standard entropy of formation from the elements and enthalpy of decomposition of copper hydride from the elements have been calculated and found to be 130.8 J K-1 mol(-1) (H-2), -85.1 J K-1 mol(-1) (H-2), -55.1 kJ mol(-1) (H-2), respectively. These new results gave the possibility of discussion on thermodynamic properties of copper hydride. Debye temperature has been for the first time determined experimentally.