Ge2Pt: enthalpy of formation
3 accepted literature formation-enthalpy value(s) (experimental 1, model 1, DFT 1); experimental median -32.4 kJ/mol-atom (n = 1); Materials Project -32.817 kJ/mol-atom (mp-aaaaachj); OQMD -33.15 kJ/mol-atom (oqmd-8191).
Systems: Ge–Pt
Literature values
| Value | Phase as printed | T (K) | Class | Method | System | Source | Location | Quote |
|---|---|---|---|---|---|---|---|---|
| -32.4 kJ/mol-atom | Ge2Pt | 298.15 | experimental | Ge–Pt | [1] Wang 2009 cites Kleppa 1991 doi | Table 1, p. 3, row 1 report | ||
| -35.88 kJ/mol-atom | Ge2Pt | 298.15 | model | assessed | Ge–Pt | [1] Wang 2009 | Table 1, p. 3, row 3 report | |
| -33.68 kJ/mol-atom | Ge2Pt | 298.15 | DFT | first-principles | Ge–Pt | [1] Wang 2009 | Table 1, p. 3, row 2 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 |
|---|---|---|---|---|---|---|---|---|
| -32.4 | kJ/mol-atom | 0.05 | 3.5 (unknown, calibrated) | 3.5 | ||||
| -35.88 | kJ/mol-atom | 0.005 | 3.9 (model_calculated, calibrated) | 3.9 | ||||
| -33.68 | kJ/mol-atom | 0.005 | 8.395 (dft, calibrated) | 8.395 |
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-aaaaachj | -32.817 | -0.340122 | Pnnm | 0.3402 | 0.0035 | no |
| OQMD | oqmd-8191 | -33.15 | -0.343577 | Pnnm | 0.4457 | 0.0046 | no |
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
- J.S. Wang, S. Jin, W.J. Zhu, H.Q. Dong, X.M. Tao, H.S. Liu et al., First-principles calculations assisted thermodynamic assessment of the Pt–Ga–Ge ternary system, Calphad 33, 561-569 (2009). doi:10.1016/j.calphad.2009.05.002