Thermodynamic properties of InP

Abstract

The emf of an electrochemical cell of the type (−) W, In(l) | ZnCl2 + KCl + NaCl + InCl | (InP(s) + P(black)), W(+) has been measured in the temperature range 500–600 K. The change in the chemical potential of this cell (ΔμIn=−52.50 + 19.01 × 10−3 T kJ/mol) corresponds to the reaction In(l) + P(black) → InP(s). The standard enthalpy of formation of InP from solid indium and white phosphorus is determined to be Δf H 0(298 K) = −69.3 ± 3 kJ/mol. We have performed thermodynamic analysis of the literature data for the In-P system, with consideration for different phosphorus allotropes.