Al3Co: enthalpy of formation
1 accepted literature formation-enthalpy value(s) (model 1); Materials Project -39.153 kJ/mol-atom (mp-aaacrxmd); OQMD -20.871 kJ/mol-atom (oqmd-349288).
Systems: Al–Co–Cr–Ni
Literature values
| Value | Phase as printed | T (K) | Class | Method | System | Source | Location | Quote |
|---|---|---|---|---|---|---|---|---|
| -22.6 kJ/mol-atom | γ'-L12 | 298.15 | model | Al–Co–Cr–Ni | [1] Liu 2016 cites ref. 86 | Table 4, p. 38, row 13 report |
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 |
|---|---|---|---|---|---|---|---|---|
| -22.6 | kJ/mol-atom | 0.05 | 3.9 (model_calculated, calibrated) | 3.9 |
DFT formation energies
Lowest-energy entries at this composition. Materials Project and OQMD use different energy references and are never averaged. 1 eV/atom = 96.485 kJ/mol-atom.
| Source | Entry | kJ/mol-atom | eV/atom | Space group | E above hull (kJ/mol-atom) | E above hull (eV/atom) | Theoretical |
|---|---|---|---|---|---|---|---|
| Materials Project | mp-aaacrxmd | -39.153 | -0.405795 | Cm | 1.0382 | 0.0108 | yes |
| OQMD | oqmd-349288 | -20.871 | -0.216311 | Pm-3m | 19.6557 | 0.2037 | yes |
DFT sources: A. Jain et al., Commentary: The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002. doi:10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501-1509; S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010. doi:10.1007/s11837-013-0755-4 (CC BY 4.0);
Sources
- Xuan L. Liu, Greta Lindwall, Thomas Gheno, Zi-Kui Liu, Thermodynamic modeling of Al–Co–Cr, Al–Co–Ni, Co–Cr–Ni ternary systems towards a description for Al–Co–Cr–Ni, Calphad 52, 125-142 (2016). doi:10.1016/j.calphad.2015.12.007