THERMOCHEMICAL DATA OF BORON SUBPHOSPHIDE

Thermochemical data of boron subphosphide are derived from reported de composition data of cubic boron monophosphide BP. Both reported boron subphosphides, i.e. B6P and B13P2, are taken into account, without cla iming either of these to have the reported stoichiometry. The standard heat of formation Delta(f)H(0), the standard entropy S-0, and the hea t capacity as a function of temperature C-P,T(0), pf B6P and B13P2 are Delta(f)H(0) = 69.2 -/+ 11.4 kJ/mol, S-0 = 213 -/+ 15 J/mol K, and C- P,T(0) = (42.0 -/+ 0.9) + (0.166 -/+ 0.004) x TJ/mol K, and Delta(f)H( 0) = 175 -/+ 4 kJ/mol, S-0 = 462 -/+ 10 J/mol K, and C-P,T(0), = (87.6 -/+ 1.8) + (0.359 -/+ 0.008) x TJ/mol K, respectively. (C) 1997 Elsev ier Science B.V.