The Congruent Vaporization of Mn2 P  ( s )

Abstract

The congruent vaporization of Mn2P(s)' has been studied by mass-loss effusion in the temperature range 1246~1500 K. The congruently vaporizing composition is Mn200P. From equilibrium measurements the enthalpy change of the vaporization reaction 2Mn~P(s) = 4Mn(g) + P2(g)

The Thermodynamic Properties of Phosphorus and Solid Binary Phosphides

“…(x) the measurement by Knudsen effusion/mass spectrometry of Mn(g) and P 2 (g) vapor pressures in congruently decomposing Mn 3 P (1200-1380 K), originally reported by Chizikov et al; [191][192][193] (xi) the measurement by Knudsen effusion/mass loss of Mn(g) and P 2 (g) vapor pressures in congruently decomposing Mn 2 P (1246-1500 K), made by Myers et al; 194…”

“…( xi ) the measurement by Knudsen effusion/mass loss of Mn(g) and P 2 (g) vapor pressures in congruently decomposing Mn 2 P (1246−1500 K), made by Myers et al; and…”

Thermodynamic Stability of Manganese Phosphides from High Temperature Solid‐State Galvanic Cells

“…Baratashvili et al (2) have reported measurements in the temperature range 851-1067 K on the solid-state cell Mn,MnF21CaF21MnF2,MnP,Mn2P [I] for which the cell reactions are Mn~ + 2F-= MnF2~s~ + 2e 2e-+ MnF2,s~ + MnP~s~ = 2F-+ Mn2P~s, Mn(~ + MnP,s~ = Mn~P,s~ [1] The results of their study were shown to be consistent, within experimental uncertainty, with a combination of results from combustion calorimetry (1) and vaporization studies (3) on MnP,~). They are also consistent with a combination of results from vaporization studies (3,4) on MnP(~ and Mn2P~s, Hence the use of solid-state galvanic cells appears to give reliable results in the Mn-P system, and it was decided to set up cell I as a check on technique and then to study the cell Mn,MnF21CaF21MnF2,Mn2P,Mn3P [II] for which reactions are…”

“…Although the thermodynamic stabilities of the manganese phosphides have been studied in several laboratories (1)(2)(3)(4), there are no data in the literature on the stability of Mn.~P other than what may be inferred from the published phase diagram (5). Mn~P melts incongruently to give liquid and Mn2P(~), which may be taken as evidence that its stability is marginal relative to Mn + Mn2P.…”