Abstract
The vaporization of aluminium phosphide was investigated over the temperature range of 1270°–1800°K using the Knudsen effusion method in combination with mass spectrometry. Aluminium phosphide decomposes according to the reaction 2AlP(s) → 2Al(g) + P2(g). The enthalpy for Reaction (1), ΔH°298, as calculated by the second- and third-law method is 261.7 ± 5.9 and 254.8 ± 2.1 kcal/mole, respectively. The second- and third-law enthalpies ΔH°298 for the reaction 4Al(g) + Al2O3(s) → 3Al2O(g) have been determined as − 10.7 ± 2.0 and − 10.5 ± 0.5 kcal/mole, respectively. The error terms given represent the standard deviation. On the basis of a selected value of 255.0 ± 6.0 kcal/mole for the enthalpy of Reaction (1) and of pertinent literature data, the standard heat of aluminium phosphide formation, ΔH°f,298 = − 28.2 ± 3.2 kcal/mole is obtained.
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