High-temperature enthalpy of praseodymium selenides in the homogeneity range bounded by Pr3Se4 and Pr2Se3
Calorimetry is used to study the enthalpy of the bounding compositions Pr 3 Se and Pr 2 Se 3 of the Pr 3– x Se 4 phase (0 ≤ x ≤ 1/3) at 450–2300 K. The temperature–concentration dependences of the thermodynamic properties of Pr 3– x Se 4 selenides in the homogeneity range are determined at 298 ≤ T ≤...
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| Veröffentlicht in: | Powder metallurgy and metal ceramics 2009, Vol.48 (1-2), p.77-82 |
|---|---|
| Hauptverfasser: | , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
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| Zusammenfassung: | Calorimetry is used to study the enthalpy of the bounding compositions Pr
3
Se and Pr
2
Se
3
of the Pr
3–
x
Se
4
phase (0 ≤
x
≤ 1/3) at 450–2300 K. The temperature–concentration dependences of the thermodynamic properties of Pr
3–
x
Se
4
selenides in the homogeneity range are determined at 298 ≤
T
≤ 2156 K. The Pr
3–
x
Se
4
enthalpy function has the following form:
H
(
T
,
x
) −
H
(298 K,
x
) = (2817 ⋅ 10
3
T
−1
− 75912 + 234.6 ⋅
T
− 4.718 ⋅ 10
−2
T
2
+ 2.624 ⋅ 10
−5
T
3
) ⋅ e
−0.2086
x
J/mole. An analysis of the partial enthalpies of Pr and Se shows that the chemical bonds between these elements change in simple substances and Pr
3–
x
Se
4
. |
|---|---|
| ISSN: | 1068-1302 1573-9066 |
| DOI: | 10.1007/s11106-009-9094-y |