Ca3Si2O7: enthalpy of formation

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

Systems: Ca–O–Si

Literature values

Enthalpy of formation of Ca3Si2O7 reported in the literature (2)
ValuePhase as printedT (K)ClassMethodSystemSourceLocationQuote
-3973 kJ/mol (basis unstated)Rankinite-Ca3Si2O7298.15modelCa–O–Si[1] Abdul 2023
cites Haas 1981 doi		Table 7, p. 8, row 6
report
-3951 kJ/mol (basis unstated)Rankinite-Ca3Si2O7298.15modelCa–O–Si[1] Abdul 2023Table 7, 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.

Uncertainty budget of the literature values of Ca3Si2O7
ValueUnitPrintedReadingMethod (class, basis)CompositionScatterConversionEffective
-3973kJ/mol (basis unstated)0.0546.8 (model_calculated, calibrated)46.8
-3951kJ/mol (basis unstated)0.0546.8 (model_calculated, calibrated)46.8

Sources

  1. Wahab Abdul, Chancel Mawalala, Alexander Pisch, Marcus Nigel Bannerman, CaO-SiO2 assessment using 3rd generation CALPHAD models, Cement and Concrete Research 173, 107309 (2023). doi:10.1016/j.cemconres.2023.107309