Na–Sn system

50 accepted literature values from 1 paper(s) (experimental 25, model 16, DFT 9); 1 calculated phase diagram(s). 3 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (16) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	25
model	16
DFT	9

Accepted values by property group
Property group	Values
invariant reaction	40
phase transition	1
formation	9

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
NaSn-17Dre.tdb	L. Dreval, M. Zschornak, W. Muenchgesang, O. Fabrichnaya, D. Rafaja, M.L. Martine, L. Giebeler, M. Motylenko, J. Alloys Compd., 695, 1725-42(2017). doi:10.1016/j.jallcom.2016.11.003	`24426b5c698632e023b7cf6db68874d6cc486553d78d11e88018fc459f6296f5`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
NaSn-17Dre.tdb	756.27	NASN_LT (x(Sn) 0.5) + NASN_HT (x(Sn) 0.5) + LIQUID (x(Sn) 0.64209)
NaSn-17Dre.tdb	756.27	LIQUID (x(Sn) 0.40195) + NASN_LT (x(Sn) 0.5) + NASN_HT (x(Sn) 0.5)
NaSn-17Dre.tdb	752.12	LIQUID (x(Sn) 0.40004) + NA4SN3 (x(Sn) 0.42857) + NASN_LT (x(Sn) 0.5)
NaSn-17Dre.tdb	708.59	NA9SN4 (x(Sn) 0.30769) + LIQUID (x(Sn) 0.37104) + NA4SN3 (x(Sn) 0.42857)
NaSn-17Dre.tdb	680.31	LIQUID (x(Sn) 0.17199) + NA15SN4_D86 (x(Sn) 0.21053) + NA9SN4 (x(Sn) 0.30769)
NaSn-17Dre.tdb	649.95	NA15SN4_D86 (x(Sn) 0.21053) + NA3SN (x(Sn) 0.25) + NA9SN4 (x(Sn) 0.30769)
NaSn-17Dre.tdb	621.35	NA9SN4 (x(Sn) 0.30769) + NA4SN3 (x(Sn) 0.42857) + NASN_LT (x(Sn) 0.5)
NaSn-17Dre.tdb	598.58	NASN_LT (x(Sn) 0.5) + NA7SN12 (x(Sn) 0.63158) + LIQUID (x(Sn) 0.79058)
NaSn-17Dre.tdb	580.67	NA7SN12 (x(Sn) 0.63158) + NASN2 (x(Sn) 0.66667) + LIQUID (x(Sn) 0.82149)
NaSn-17Dre.tdb	562.08	NASN2 (x(Sn) 0.66667) + NA5SN13 (x(Sn) 0.72222) + LIQUID (x(Sn) 0.85414)
NaSn-17Dre.tdb	502.28	NA5SN13 (x(Sn) 0.72222) + NASN4 (x(Sn) 0.8) + LIQUID (x(Sn) 0.93836)
NaSn-17Dre.tdb	499.39	NASN4 (x(Sn) 0.8) + NASN5 (x(Sn) 0.83333) + LIQUID (x(Sn) 0.94227)
NaSn-17Dre.tdb	490.84	NASN5 (x(Sn) 0.83333) + LIQUID (x(Sn) 0.9547) + BCT_A5 (x(Sn) 1)
NaSn-17Dre.tdb	370.16	BCC_A2 (x(Sn) 0) + LIQUID (x(Sn) 0.00162) + NA15SN4_D86 (x(Sn) 0.21053)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Na–Sn system (40)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location
851	congruent melting: L -> (αNaSn)	(αNaSn): Sn 0.5; αNaSn: Sn 0.5	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 36 report
851	congruent melting: L -> (αNaSn)	L: Sn 0.5; (αNaSn): Sn 0.5; αNaSn: Sn 0.5	model	[1] Dreval 2017 cites Wang 2013 doi	Table 8, p. 12, row 37 report
850	congruent melting: L -> (αNaSn)	L: Sn 0.5; (αNaSn): Sn 0.5; αNaSn: Sn 0.5	model	[1] Dreval 2017	Table 8, p. 12, row 38 report
849	congruent melting: L -> (αNaSn)	(αNaSn): Sn 0.5; αNaSn: Sn 0.5	experimental	[1] Dreval 2017 cites Vournasos 1911 doi	Table 8, p. 12, row 35 report
849	congruent melting: L -> (αNaSn)	(αNaSn): Sn 0.5; αNaSn: Sn 0.5	experimental	[1] Dreval 2017 cites Mathewson 1905 doi	Table 8, p. 12, row 34 report
756	polymorphic: (αNaSn) -> (βNaSn)	(αNaSn): Sn 0.5; (βNaSn): Sn 0.5	experimental	[1] Dreval 2017 cites Mathewson 1905 doi	Table 8, p. 12, row 39 report
756	polymorphic: (αNaSn) -> (βNaSn)	(αNaSn): Sn 0.5; (βNaSn): Sn 0.5	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 41 report
756	polymorphic: (αNaSn) -> (βNaSn)	(αNaSn): Sn 0.5; (βNaSn): Sn 0.5	experimental	[1] Dreval 2017 cites Vournasos 1911 doi	Table 8, p. 12, row 40 report
753	congruent melting: L -> Na9Sn4	L: Sn 0.3077; Na9Sn4: Sn 0.3077	model	[1] Dreval 2017	Table 8, p. 12, row 19 report
753	congruent melting: L -> Na9Sn4	L: Sn 0.3077; Na9Sn4: Sn 0.3077	model	[1] Dreval 2017 cites Wang 2013 doi	Table 8, p. 12, row 18 report
752	L + (βNaSn) -> Na4Sn3	L: Sn 0.4; (βNaSn): Sn 0.5; Na4Sn3: Sn 0.4286; βNaSn: Sn 0.5	model	[1] Dreval 2017	Table 8, p. 12, row 33 report
752	L + (βNaSn) -> Na4Sn3	(βNaSn): Sn 0.5; Na4Sn3: Sn 0.4286; βNaSn: Sn 0.5	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 31 report
751	congruent melting: L -> Na9Sn4	L: Sn 0.333; Na9Sn4: Sn 0.333	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 17 report
751	L + (βNaSn) -> Na4Sn3	(βNaSn): Sn 0.5; Na4Sn3: Sn 0.4286; βNaSn: Sn 0.5	experimental	[1] Dreval 2017 cites Vournasos 1911 doi	Table 8, p. 12, row 30 report
750	congruent melting: L -> Na9Sn4	L: Sn 0.333; Na9Sn4: Sn 0.333	experimental	[1] Dreval 2017 cites Vournasos 1911 doi	Table 8, p. 12, row 16 report
750	L + (βNaSn) -> Na4Sn3	L: Sn 0.41; (βNaSn): Sn 0.5; Na4Sn3: Sn 0.4286; βNaSn: Sn 0.5	model	[1] Dreval 2017 cites Wang 2013 doi	Table 8, p. 12, row 32 report
750	congruent melting: L -> Na9Sn4	L: Sn 0.3333; Na9Sn4: Sn 0.3333	experimental	[1] Dreval 2017 cites Mathewson 1905 doi	Table 8, p. 12, row 15 report
714	eutectic: L -> Na9Sn4 + Na4Sn3	L: Sn 0.38; Na9Sn4: Sn 0.333; Na4Sn3: Sn 0.4286	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 22 report
713	eutectic: L -> Na9Sn4 + Na4Sn3	Na9Sn4: Sn 0.333; Na4Sn3: Sn 0.4286	experimental	[1] Dreval 2017 cites Vournasos 1911 doi	Table 8, p. 12, row 21 report
713	eutectic: L -> Na9Sn4 + Na4Sn3	L: Sn 0.383; Na9Sn4: Sn 0.3333; Na4Sn3: Sn 0.4286	experimental	[1] Dreval 2017 cites Mathewson 1905 doi	Table 8, p. 12, row 20 report
709	eutectic: L -> Na9Sn4 + Na4Sn3	L: Sn 0.37; Na9Sn4: Sn 0.75; Na4Sn3: Sn 0.5	model	[1] Dreval 2017	Table 8, p. 12, row 24 report
707	eutectic: L -> Na9Sn4 + Na4Sn3	L: Sn 0.38; Na9Sn4: Sn 0.3077; Na4Sn3: Sn 0.4286	model	[1] Dreval 2017 cites Wang 2013 doi	Table 8, p. 12, row 23 report
684	L + Na9Sn4 -> Na15Sn4	Na9Sn4: Na 0.692308, Sn 0.307692; Na15Sn4: Sn 0.2	experimental	[1] Dreval 2017 cites Lamprecht 1967 doi	Table 8, p. 12, row 9 report
681	L + Na9Sn4 -> Na15Sn4	Na9Sn4: Na 0.692308, Sn 0.307692; Na15Sn4: Sn 0.2	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 8 report
680	L + Na9Sn4 -> Na15Sn4	L: Sn 0.17; Na9Sn4: Sn 0.3077; Na15Sn4: Sn 0.2105	model	[1] Dreval 2017	Table 8, p. 12, row 11 report
680	L + Na9Sn4 -> Na15Sn4	L: Sn 0.19; Na9Sn4: Sn 0.3077; Na15Sn4: Sn 0.2105	model	[1] Dreval 2017 cites Wang 2013 doi	Table 8, p. 12, row 10 report
678	L + Na9Sn4 -> Na15Sn4	L: Sn 0.192; Na9Sn4: Sn 0.3333; Na15Sn4: Sn 0.2	experimental	[1] Dreval 2017 cites Mathewson 1905 doi	Table 8, p. 12, row 6 report
678	L + Na9Sn4 -> Na15Sn4	Na9Sn4: Sn 0.3333; Na15Sn4: Sn 0.2	experimental	[1] Dreval 2017 cites Vournasos 1911 doi	Table 8, p. 12, row 7 report
650	Na3Sn -> Na15Sn4 + Na9Sn4	Na3Sn: Sn 0.75; Na15Sn4: Sn 0.2105; Na9Sn4: Sn 0.3077	model	[1] Dreval 2017	Table 8, p. 12, row 14 report
650	Na3Sn -> Na15Sn4 + Na9Sn4	Na3Sn: Sn 0.75; Na15Sn4: Sn 0.2105; Na9Sn4: Sn 0.3077	model	[1] Dreval 2017 cites Wang 2013 doi	Table 8, p. 12, row 13 report
650	Na3Sn -> Na15Sn4 + Na9Sn4	Na3Sn: Sn 0.75; Na15Sn4: Sn 0.2; Na9Sn4: Sn 0.333	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 12 report
630	Na4Sn3 -> Na9Sn4 + (βNaSn)	Na4Sn3: Sn 0.4286; Na9Sn4: Sn 0.333; (βNaSn): Sn 0.5; βNaSn: Sn 0.5	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 26 report
628	Na4Sn3 -> Na9Sn4 + (βNaSn)	Na4Sn3: Sn 0.4286; Na9Sn4: Sn 0.4286; (βNaSn): Sn 0.5; βNaSn: Sn 0.5	model	[1] Dreval 2017 cites Wang 2013 doi	Table 8, p. 12, row 27 report
621	Na4Sn3 -> Na9Sn4 + (βNaSn)	Na4Sn3: Sn 0.4286; Na9Sn4: Sn 0.4286; (βNaSn): Sn 0.5; βNaSn: Sn 0.5	model	[1] Dreval 2017	Table 8, p. 12, row 28 report
621	Na4Sn3 -> Na9Sn4 + (βNaSn)	Na4Sn3: Sn 0.4286; Na9Sn4: Sn 0.3333; (βNaSn): Sn 0.5; βNaSn: Sn 0.5	experimental	[1] Dreval 2017 cites Mathewson 1905 doi	Table 8, p. 12, row 25 report
370.83	eutectic: L -> (βNa) + Na15Sn4	Na15Sn4: Sn 0.2105	experimental	[1] Dreval 2017 cites Hubberstey 1974 doi	Table 8, p. 12, row 3 report
370	eutectic: L -> (βNa) + Na15Sn4	Na15Sn4: Sn 0.2105	model	[1] Dreval 2017 cites Wang 2013 doi	Table 8, p. 12, row 4 report
370	eutectic: L -> (βNa) + Na15Sn4	Na15Sn4: Sn 0.2	experimental	[1] Dreval 2017 cites Mathewson 1905 doi	Table 8, p. 12, row 1 report
370	eutectic: L -> (βNa) + Na15Sn4	L: Sn 0.001; Na15Sn4: Sn 0.2105	model	[1] Dreval 2017	Table 8, p. 12, row 5 report
370	eutectic: L -> (βNa) + Na15Sn4	Na15Sn4: Sn 0.2	experimental	[1] Dreval 2017 cites Hume-Rothery 1928 doi	Table 8, p. 12, row 2 report

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Na–Sn system (9)
Phase	Value	Class	Source	Location
Na5Sn13	-2.025 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 27 report
Na5Sn13	-1.843 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 28 report
Na7Sn12	-3.421 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 30 report
Na7Sn12	-3.335 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 31 report
Na9Sn4	-2.51 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 23 report
Na9Sn4	-1.774 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 24 report
NaSn5	-0.36 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 29 report
βNaSn	-0.452 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 25 report
βNaSn	-0.445 eV	DFT	[1] Dreval 2017	Table 3, p. 7, row 26 report

Other properties

Phase transition (1)

Phase transition, Na–Sn system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	621 K	621	polymorphic	experimental	[1] Dreval 2017 cites Mathewson 1905 doi	p. 3 report	In his work, Mathewson [42] proposed a polymorphic transformation for the Na4Sn3 compound at 621 K.

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

Liya Dreval, Matthias Zschornak, Wolfram Münchgesang, Olga Fabrichnaya, David Rafaja, Miléna L. Martine et al., Thermodynamic assessment and first principle calculations of the Na Sb Sn system, Journal of Alloys and Compounds 695, 1725-1742 (2017). doi:10.1016/j.jallcom.2016.11.003

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-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
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); 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; 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). 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_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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}
}