Nb6Sn5: enthalpy of formation
6 accepted literature formation-enthalpy value(s) (model 6).
Systems: Nb–Sn
Literature values
| Value | Phase as printed | T (K) | Class | Method | System | Source | Location | Quote |
|---|---|---|---|---|---|---|---|---|
| -22 kJ/mol (basis unstated) | Nb6Sn5 | 298.15 | model | Nb–Sn | [1] Toffolon 1998 cites ref. 88Deb | Table 2, p. 1, row 1 report | ||
| -22 kJ/mol-atom | Nb0.545Sn0.455 | 298.15 | model | Nb–Sn | [2] Toffolon 2002 cites ref. 1988Deb | Table 3, p. 3, row 1 report | ||
| -17.983 kJ/mol-atom | Nb0.545Sn0.455 | 1173 | model | Nb–Sn | [2] Toffolon 2002 | Table 3, p. 3, row 4 report | ||
| -14.814 kJ/mol-atom | Nb0.545Sn0.455 | 298.15 | model | Nb–Sn | [2] Toffolon 2002 | Table 3, p. 3, row 3 report | ||
| -2.653 kJ/mol (basis unstated) | Nb6Sn5 | 1173 | model | Nb–Sn | [1] Toffolon 1998 | Table 2, p. 1, row 2 report | ||
| -2.653 kJ/mol-atom | Nb0.545Sn0.455 | 1173 | model | Nb–Sn | [2] Toffolon 2002 cites Toffolon 2002 | Table 3, 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 |
|---|---|---|---|---|---|---|---|---|
| -22 | kJ/mol (basis unstated) | 5.000e-4 | 35.1 (model_calculated, calibrated) | 35.1 | ||||
| -22 | kJ/mol-atom | 0.05 | 3.9 (model_calculated, calibrated) | 3.9 | ||||
| -17.983 | kJ/mol-atom | 5.000e-4 | 3.9 (model_calculated, calibrated) | 3.9 | ||||
| -14.814 | kJ/mol-atom | 5.000e-4 | 3.9 (model_calculated, calibrated) | 3.9 | ||||
| -2.653 | kJ/mol (basis unstated) | 5.000e-4 | 35.1 (model_calculated, calibrated) | 35.1 | ||||
| -2.653 | kJ/mol-atom | 5.000e-4 | 3.9 (model_calculated, calibrated) | 3.9 |
Sources
- C. Toffolon, C. Servant, B. Sundman, Thermodynamic assessment of the Nb-Sn system, JPE 19, 479-485 (1998). doi:10.1361/105497198770341978
- C. Toffolon, C. Servant, J. C. Gachon, B. Sundman, Reassessment of the Nb-Sn system, JPE 23, 134-139 (2002). doi:10.1361/1054971023604071