Ni5Si2: enthalpy of formation
4 accepted literature formation-enthalpy value(s) (experimental 2, model 2); experimental median -43.7 kJ/mol-atom (n = 2).
Systems: Ni–Si
Literature values
| Value | Phase as printed | T (K) | Class | Method | System | Source | Location | Quote |
|---|---|---|---|---|---|---|---|---|
| -45.1 kJ/mol-atom | Ni5Si2(γ) | 298.15 | experimental | Ni–Si | [1] Tokunaga 2003 cites Meschel 1998 doi | Table 4, p. 7, row 3 report | ||
| -42.3 kJ/mol-atom | Ni5Si2(γ) | 298.15 | experimental | Ni–Si | [1] Tokunaga 2003 cites Oelson 1936 | Table 4, p. 7, row 1 report | ||
| -48.8 kJ/mol-atom | Ni5Si2(γ) | model | CALPHAD assessment | Ni–Si | [1] Tokunaga 2003 | Table 4, p. 7, row 5 report | ||
| -43.5 kJ/mol-atom | Ni5Si2(γ) | model | Ni–Si | [1] Tokunaga 2003 cites Lindholm 1996 doi | Table 4, p. 7, row 6 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 |
|---|---|---|---|---|---|---|---|---|
| -45.1 | kJ/mol-atom | 0.05 | 3.5 (unknown, calibrated) | 3.5 | ||||
| -42.3 | kJ/mol-atom | 0.05 | 3.5 (unknown, calibrated) | 3.5 | ||||
| -48.8 | kJ/mol-atom | 0.05 | 3.9 (model_calculated, calibrated) | 3.9 | ||||
| -43.5 | kJ/mol-atom | 0.05 | 3.9 (model_calculated, calibrated) | 3.9 |
Sources
- Tatsuya Tokunaga, Kazumasa Nishio, Hiroshi Ohtani, Mitsuhiro Hasebe, Thermodynamic assessment of the Ni–Si system by incorporating ab initio energetic calculations into the CALPHAD approach, Calphad 27, 161-168 (2003). doi:10.1016/s0364-5916(03)00049-x