Al18Cr2Mg3: enthalpy of formation

2 accepted literature formation-enthalpy value(s) (model 1, DFT 1).

Systems: Al–Cr–Mg

Literature values

Enthalpy of formation of Al18Cr2Mg3 reported in the literature (2)
ValuePhase as printedT (K)ClassMethodSystemSourceLocationQuote
-246.5 kJ/mol (basis unstated)T (Al18Mg3Cr2)298.15modelCALPHAD type of assessmentAl–Cr–Mg[1] Cui 2017Table 3, p. 4, row 4
report
-238.5 kJ/mol (basis unstated)T (Al18Mg3Cr2)298.15DFTFirst principles calculationAl–Cr–Mg[1] Cui 2017Table 3, p. 4, row 3
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.

Uncertainty budget of the literature values of Al18Cr2Mg3
ValueUnitPrintedReadingMethod (class, basis)CompositionScatterConversionEffective
-246.5kJ/mol (basis unstated)0.053.9 (model_calculated, calibrated)3.9
-238.5kJ/mol (basis unstated)0.053.929 (dft, calibrated)3.929

Sources

  1. Senlin Cui, In-Ho Jung, Junghwan Kim, Jinghua Xin, A coupled experimental and thermodynamic study of the Al-Cr and Al-Cr-Mg systems, Journal of Alloys and Compounds 698, 1038-1057 (2017). doi:10.1016/j.jallcom.2016.12.298