Cu3Ge: enthalpy of formation
3 accepted literature formation-enthalpy value(s) (experimental 2, model 1).
Systems: Cu–Ge
Literature values
| Value | Phase as printed | T (K) | Class | Method | System | Source | Location | Quote |
|---|---|---|---|---|---|---|---|---|
| -7.66 kJ/mol (basis unstated) | -Cu0.75 Ge0.25 | 780 | experimental | Cu–Ge | [1] Wang 2010 cites Predel 1971 doi | p. 2 report | The enthalpy of formation of intermetallic compound -Cu0.75 Ge0.25 was also obtained by Predel and Stein [21] at 780 K, which is -7660 J/mol at 25 at.% Ge. | |
| -7.66 kJ/mol (basis unstated) | -Cu0.75Ge0.25 | 298.15 | experimental | Cu–Ge | [1] Wang 2010 cites Predel 1971 doi | p. 6 report | The enthalpy of formation of solid alloys and intermetallic compounds in the Cu-Ge binary system at 298 K was calculated as presented in Fig. 10. As can be seen, the present calculated values in solid alloys are in excellent agreement with the experimental data measured by Predel and Stein [21,29] and Kleppa and King [31]. However, the calculated enthalpy of formation of the intermetallic compoun… | |
| -4.245 kJ/mol (basis unstated) | -Cu0.75Ge0.25 | 298.15 | model | Cu–Ge | [1] Wang 2010 | p. 6 report | The enthalpy of formation of solid alloys and intermetallic compounds in the Cu-Ge binary system at 298 K was calculated as presented in Fig. 10. As can be seen, the present calculated values in solid alloys are in excellent agreement with the experimental data measured by Predel and Stein [21,29] and Kleppa and King [31]. However, the calculated enthalpy of formation of the intermetallic compoun… |
Uncertainty budget
Components kept separate, in the value's unit (literature SCHEMA.md, UNCERTAINTY_CALIBRATION.md): effective = max(sqrt(max(printed, reading, method)^2 + composition^2 + conversion^2), scatter). The method floor is the robust between-study scatter of the method class in ORCHID (calibrated) or a documented prior; printed values and printed uncertainties are unchanged.
| Value | Unit | Printed | Reading | Method (class, basis) | Composition | Scatter | Conversion | Effective |
|---|---|---|---|---|---|---|---|---|
| -7.66 | kJ/mol (basis unstated) | 0.005 | 3.5 (unknown, calibrated) | 3.5 | ||||
| -7.66 | kJ/mol (basis unstated) | 0.005 | 3.5 (unknown, calibrated) | 3.5 | ||||
| -4.245 | kJ/mol (basis unstated) | 5.000e-4 | 3.9 (model_calculated, calibrated) | 3.9 |
Sources
- J. Wang, S. Jin, C. Leinenbach, A. Jacot, Thermodynamic assessment of the Cu–Ge binary system, Journal of Alloys and Compounds 504, 159-165 (2010). doi:10.1016/j.jallcom.2010.05.077