Ni2B: enthalpy of formation
4 accepted literature formation-enthalpy value(s) (experimental 1, model 3).
Systems: B–Ni
Literature values
| Value | Phase as printed | T (K) | Class | Method | System | Source | Location | Quote |
|---|---|---|---|---|---|---|---|---|
| -22.6 kJ/mol (basis unstated) ± 1.4 | Ni2B | 298.15 | experimental | B–Ni | [1] Campbell 1999 cites Sato 1982 doi | Table 8, p. 8, row 1 report | ||
| -27 kJ/mol (basis unstated) | Ni2B | 298.15 | model | B–Ni | [1] Campbell 1999 cites Niessen 1983 doi | Table 8, p. 8, row 3 report | ||
| -26.7 kJ/mol (basis unstated) | Ni2B | 298.15 | model | B–Ni | [1] Campbell 1999 | Table 8, p. 8, row 4 report | ||
| -21.13 kJ/mol (basis unstated) | Ni2B | 298.15 | model | B–Ni | [1] Campbell 1999 cites Teppo 1993 doi | Table 8, p. 8, row 5 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 (basis unstated) | 1.4 | 0.05 | 10.5 (unknown, calibrated) | 10.5 | |||
| -27 | kJ/mol (basis unstated) | 0.5 | 11.7 (model_calculated, calibrated) | 11.7 | ||||
| -26.7 | kJ/mol (basis unstated) | 0.05 | 11.7 (model_calculated, calibrated) | 11.7 | ||||
| -21.13 | kJ/mol (basis unstated) | 0.005 | 11.7 (model_calculated, calibrated) | 11.7 |
Sources
- C. E. Campbell, U. R. Kattner, A thermodynamic assessment of the Ni-Al-B system, JPE 20, 485-496 (1999). doi:10.1361/105497199770340743