Sc5Si3: enthalpy of formation

5 accepted literature formation-enthalpy value(s) (experimental 3, model 2); experimental median -102.8 kJ/mol-atom (n = 3); Materials Project -71.535 kJ/mol-atom (mp-aaaaalow); OQMD -74.229 kJ/mol-atom (oqmd-4475).

Systems: Sc–Si

Literature values

Enthalpy of formation of Sc5Si3 reported in the literature (5)
Value	Phase as printed	T (K)	Class	Method	System	Source	Location
-161.1 kJ/mol-atom	Sc5Si3	298.15	experimental	Acid solution calorimetry	Sc–Si	[1] Qin 2015 cites Golutvin 1984	Table 2, p. 3, row 1 report
-102.8 kJ/mol-atom ± 3.8	Sc5Si3	935	experimental	EMF	Sc–Si	[1] Qin 2015 cites Lukashenko 1992 doi	Table 2, p. 3, row 3 report
-89.9 kJ/mol-atom ± 4.3	Sc5Si3	298.15	experimental	Solute–solvent drop calorimetry	Sc–Si	[1] Qin 2015 cites Topor 1989 doi	Table 2, p. 3, row 2 report
-90.3 kJ/mol-atom	Sc5Si3	298.15	model	Calculated	Sc–Si	[1] Qin 2015	Table 2, p. 3, row 7 report
4.236 kJ/mol-atom	Sc5Si3	298.15	model	Calculated	Sc–Si	[1] Qin 2015 cites Sychev 1980	Table 2, p. 3, row 6 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 Sc5Si3
Value	Unit	Printed	Reading	Method (class, basis)	Effective
-161.1	kJ/mol-atom		0.05	3.2 (solution_reaction_calorimetry, calibrated)	3.2
-102.8	kJ/mol-atom	3.8	0.05	4.6 (emf, cleaned_below_threshold)	4.6
-89.9	kJ/mol-atom	4.3	0.05	3.2 (solution_reaction_calorimetry, calibrated)	4.3
-90.3	kJ/mol-atom		0.05	3.9 (model_calculated, calibrated)	3.9
4.236	kJ/mol-atom		5.000e-4	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 Sc5Si3
Source	Entry	kJ/mol-atom	eV/atom	Space group	E above hull (kJ/mol-atom)	E above hull (eV/atom)	Theoretical
Materials Project	mp-aaaaalow	-71.535	-0.741414	P6_3/mcm	0	0	no
OQMD	oqmd-4475	-74.229	-0.769334	P63/mcm	0	0	no

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

Aning Qin, Dandan Liu, Chong Chen, Shuhong Liu, Yong Du, Man Wang et al., Heat contents of Sc5Si3 and ScSi intermetallics and thermodynamic modeling of the Sc–Si system, J Therm Anal Calorim 119, 1315-1321 (2015). doi:10.1007/s10973-014-4216-2

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Parity: DFT-vs-experiment formation-enthalpy benchmark (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735943
R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23736065

Also cite the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0); G. Kim, S. V. Meschel, P. Nash, W. Chen, Experimental formation enthalpies for intermetallic phases and other inorganic compounds, Scientific Data 4 (2017) 170162, https://doi.org/10.1038/sdata.2017.162; B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file. Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

@misc{orchid_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_dft_benchmark_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Parity: DFT-vs-experiment formation-enthalpy benchmark}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735943},
  url       = {https://doi.org/10.5281/zenodo.23735943},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}