The vaporization reactions
24/5 normalCrPfalse(normalsfalse)=2/5 Cr12P7false(normalsfalse)+P2false(normalgfalse)false(1194–1479Kfalse)
,
2/3 Cr12P7false(normalsfalse)=8/3 Cr3Pfalse(normalsfalse)+P2false(normalgfalse)false(1421–1541Kfalse)
, and
2Cr3Pfalse(normalsfalse)=6normalCrfalse(normalsfalse)+P2false(normalgfalse)false(1543–1768Kfalse)
have been studied under mass‐loss effusion in the temperature ranges indicated. The reactions are kinetically inhibited. Enthalpies of formation and atomization, respectively, are found to be in kK: for
1/2normalCrPfalse(normalsfalse)
,
−5.69±0.18
and
49.67±0.2
; for
1/19 Cr12P7false(normalsfalse)
,
−4.48±0.32
and
49.47±0.3
; for
1/4 Cr3Pfalse(normalsfalse)
,
−3.18±0.04
and
49.08±0.04
.
normalCrP
is found to follow the trend in atomization enthalpy to valence state atoms established in the series
normalMnP
,
normalFeP
,
normalCoP
, and
normalNiP
.
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)
Die kinetisch behinderten Verdampfungsreaktionen A‐Cwerden in den angegebenen Temp.‐Intervallen durch Massenverlust‐Effusion untersucht und die Stabilitätsdaten (Bildungsenthalpien aus rotem Pund Atomisierungsenthalpien) der Chromphosphide bei 298.15 K bestimmt.
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