The determination of the enthalpy of formation and the enthalpy increment of Cd0.5Te0.5 by Calvet calorimetry |
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Authors: | R Agarwal V Venugopal DD Sood |
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Affiliation: | Fuel Chemistry Division, Bhabha Atomic Research Centre, Bombay 400085, India |
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Abstract: | The enthalpy of formation of Cd0.5Te0.5(s) has been determined using a Calvet calorimeter at 785 K by direct reaction calorimetry. The heat changes were measured for the additions of Cd(s) or Te(s) from 298 K to a reaction crucible containing the other liquid metal at 785 K. Measurements were also carried out to determine the enthalpy changes due to the direct reaction of the Te(l) and Cd(l) at 785 K. The enthalpies of formation of Cd0.5Te0.5 calculated from the two sets of experiments were in agreement. The HT°---H298° values of the Cd0.5Te0.5 compound have also been determined in the temperature range 406–826 K by the drop method. Using ΔHfm° at 785 K and HT---H298° values of Cd0.5Te0.5, ΔHfm° at 298 K was determined to be −(50.349±0.510) kJ mol−1. |
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