Ti3B4: enthalpy of formation

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

Systems: B–Ti

Literature values

Enthalpy of formation of Ti3B4 reported in the literature (2)
ValuePhase as printedT (K)ClassMethodSystemSourceLocationQuote
-94.3 kJ/mol (basis unstated)Ti3B4modelB–Ti[1] Nakama 2009
cites Witusiewicz 2008 doi		Table 3, p. 6, row 4
report
-85.5 kJ/mol (basis unstated)Ti3B40DFTFirst principlesB–Ti[1] Nakama 2009Table 3, p. 6, 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 Ti3B4
ValueUnitPrintedReadingMethod (class, basis)CompositionScatterConversionEffective
-94.3kJ/mol (basis unstated)0.0527.3 (model_calculated, calibrated)27.3
-85.5kJ/mol (basis unstated)0.0569.76 (dft, calibrated)69.76

Sources

  1. Yu Nakama, Hiroshi Ohtani, Mitsuhiro Hasebe, Thermodynamic Analysis of the Nb–Ti–B Ternary Phase Diagram, Mater. Trans. 50, 984-993 (2009). doi:10.2320/matertrans.mc200820