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 Ni2Sm3
Value
Unit
Printed
Reading
Method (class, basis)
Composition
Scatter
Conversion
Effective
-26.6
kJ/mol-atom
0.05
3.9 (model_calculated, calibrated)
3.9
DFT formation energies
Lowest-energy entries at this composition. Materials Project and OQMD use different energy references and are never averaged. 1 eV/atom = 96.485 kJ/mol-atom.
DFT formation energy of Ni2Sm3
Source
Entry
kJ/mol-atom
eV/atom
Space group
E above hull (kJ/mol-atom)
E above hull (eV/atom)
Theoretical
OQMD
oqmd-1792928
-28.208
-0.292353
C2/m
1.2214
0.0127
yes
DFT sources: A. Jain et al., Commentary: The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002. doi:10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501-1509; S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010. doi:10.1007/s11837-013-0755-4 (CC BY 4.0);
Sources
Z. Rahou, K. Mahdouk, Thermodynamic reassessment of the Sm–Ni binary system, Journal of Alloys and Compounds 664, 469-475 (2016). doi:10.1016/j.jallcom.2015.12.215