Behavior in vacuum at high temperatures and thermodynamic properties of nickel phosphide Ni3P

Determination of standard Gibbs free energy of formation for Ca2P2O7 and Ca(PO3)2 from solid-state EMF measurements using yttria stabilised zirconia as solid electrolyte

“…The decision to use the literature values of D f G (Ca 3 (PO 4 ) 2 ) and D f G (Ni 3 P) in equation (14) [2] and Ni 3 P [12, [14][15][16][17][18] were somewhat smaller than the literature value of Ca 2 P 2 O 7 [14]. From the analysis of equilibrium (I) it is evident that the stoichiometry is more favourable using Ca 3 (PO 4 ) 2 instead of Ca 2 P 2 O 7 as a reference phase.…”

The Thermodynamic Properties of Phosphorus and Solid Binary Phosphides

“…- 220 Boone and Kleppa 35 Viksman and Gordienko 218 Miodownik 216 Press et al 227 Kubaschewski et al 121 de Boer et al 100 Barin et al 4 Elliott and Gleiser formation of nickel phosphides (converted to red (V) reference state) estimated by different sources. An obvious need exists for further experimental measurements in this system.…”

“…Three investigations of equilibrium vapor pressures in the system have been reported. Viksman and Gordienko used Knudsen effusion/mass spectrometry to determine p P 2 in equilibrium with Ni 3 P and elemental nickel; for the reaction, Δ G ° was −73 887 J/mol at 1744 K and −79 306 J/mol at 1761 K. Biltz and Heimbrecht measured the partial pressure of P 4 in equilibrium with NiP 3 /NiP 2 and NiP 2 /Ni 5 P 4 mixtures; for the reaction, Δ G ° was +3125 J/mol at 870 K and +969 J/mol at 917 K. (It should be noted that NiP 3 is not stable at these temperatures in Figure ; this further emphasizes the tentative nature of the diagram.) For the reaction, Δ G ° was +2957 J/mol at 1034 K.…”

Thermochemistry of the nickel–phosphorus system

“…The second study is that of Myers and Conti [22] who employed a Knudsen effusion mass loss technique to measure the vapor pressure of P 2 over the mixtures (Ni 2 P þ Ni 12 P 5 ) and (Ni 12 P 5 þ 'Ni 2.55 P'). Viksman and Gordienko [23] also used a Knudsen method to determine phosphorus partial pressures in equilibrium with Ni 3 P and elemental Ni over a temperature range 1380e1790 K and derived DH f 0 for Ni 3 P.…”