Hf–Sn phases

9 phases (tier A 7, tier B 1, liquid 1); 7 stable in a calculated diagram. Structure types are assigned only when the stored evidence supports an assignment under the stated tier rules (tier A: standard phase name; tier B: unique Materials Project + OQMD on-hull match, DFT-supported; tier C: one structure stated by the assessment's crystallographic table, assessor-stated); other phases list candidates and are marked needs_review. Stability is from phase diagrams calculated with pycalphad from the SGTE binary collection (evidence class: model).

Data: interactive registry · full JSON · Hf–Sn system page · Markdown · field reference

Phases of the Hf–Sn system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:hf-sn:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
BCT_A5 phase:hf-sn:a5-bct	beta-Sn · A5 · tI4 · I4_1/amd (141)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–505.08 K, x(Sn) 1–1	0	2
BCC_A2 phase:hf-sn:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 1953.22–2871.98 K, x(Sn) 0–0.15588	0	2
FCC_A1 phase:hf-sn:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
HCP_A3 phase:hf-sn:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2017.03 K, x(Sn) 0–0.14285	0	2
HF5SN3_D88 phase:hf-sn:hf5sn3-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2244.34 K, x(Sn) 0.375–0.44444	0	2
HF5SN4 phase:hf-sn:hf5sn4	Ga4Ti5 · hP18 · P6_3/mcm (193)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–2013.29 K, x(Sn) 0.44444–0.44444	4	1
HFSN2_C40 phase:hf-sn:hfsn2-c40	CrSi2 · C40 · hP9 · P6_222 (180)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1824.66 K, x(Sn) 0.66667–0.66667	0	2
LIQUID phase:hf-sn:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 505.08–4000 K, x(Sn) 0–1	1	2

DIAMOND_A4 (Hf–Sn)

Id: phase:hf-sn:a4-diamond; status assigned
Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type st:a4-c-diamond-cf8; tier A: standard phase name; confidence high
Stoichiometry: Sn 1.0000
Stability: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hf-sn:a4-diamond
tdb: tdb:HfSn-12Tan.tdb:DIAMOND_A4, tdb:HfSn-16Ber.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (2): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: DIAMOND_A4, type code %, sha256 6a3156ac006b45a5…

41: PHASE DIAMOND_A4 % 1 1 !
42: CONST DIAMOND_A4 : SN : !

HfSn-16Ber.tdb: DIAMOND_A4, type code %, sha256 8ebcf7873dc489e2…

45: PHASE DIAMOND_A4 % 1 1 !
46: CONST DIAMOND_A4 : SN : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase
doi:10.1016/j.commatsci.2016.08.042 A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).
assessment that models this phase

BCT_A5 (Hf–Sn)

Id: phase:hf-sn:a5-bct; status assigned
Structure: beta-Sn · A5 · tI4 · I4_1/amd (141); type st:a5-beta-sn-ti4; tier A: standard phase name; confidence high
Stoichiometry: Sn 1.0000
Stability: stable in 2 of 2 calculated diagram(s): 300–505.08 K, x(Sn) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hf-sn:a5-bct
tdb: tdb:HfSn-12Tan.tdb:BCT_A5, tdb:HfSn-16Ber.tdb:BCT_A5

TDB models of BCT_A5 (2): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: BCT_A5, type code %, sha256 6a3156ac006b45a5…

46: PHASE BCT_A5 % 1 1 !
47: CONST BCT_A5 : SN : !

HfSn-16Ber.tdb: BCT_A5, type code %, sha256 8ebcf7873dc489e2…

50: PHASE BCT_A5 % 1 1 !
51: CONST BCT_A5 : SN : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase
doi:10.1016/j.commatsci.2016.08.042 A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).
assessment that models this phase

BCC_A2 (Hf–Sn)

Id: phase:hf-sn:bcc-a2; status assigned
Structure: W · A2 · cI2 · Im-3m (229); type st:a2-w-ci2; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1953.22–2871.98 K, x(Sn) 0–0.15588
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hf-sn:bcc-a2
tdb: tdb:HfSn-12Tan.tdb:BCC_A2, tdb:HfSn-16Ber.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: BCC_A2, type code %B, sha256 6a3156ac006b45a5…

31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : HF% SN : VA : !

HfSn-16Ber.tdb: BCC_A2, type code %B, sha256 8ebcf7873dc489e2…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : HF% SN : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase
doi:10.1016/j.commatsci.2016.08.042 A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).
assessment that models this phase

FCC_A1 (Hf–Sn)

Id: phase:hf-sn:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hf-sn:fcc-a1
tdb: tdb:HfSn-12Tan.tdb:FCC_A1, tdb:HfSn-16Ber.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: FCC_A1, type code %A, sha256 6a3156ac006b45a5…

26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : HF SN : VA : !

HfSn-16Ber.tdb: FCC_A1, type code %A, sha256 8ebcf7873dc489e2…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : HF SN : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase
doi:10.1016/j.commatsci.2016.08.042 A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).
assessment that models this phase

HCP_A3 (Hf–Sn)

Id: phase:hf-sn:hcp-a3; status assigned
Structure: Mg · A3 · hP2 · P6_3/mmc (194); type st:a3-mg-hp2; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–2017.03 K, x(Sn) 0–0.14285
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hf-sn:hcp-a3
tdb: tdb:HfSn-12Tan.tdb:HCP_A3, tdb:HfSn-16Ber.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: HCP_A3, type code %A, sha256 6a3156ac006b45a5…

36: PHASE HCP_A3 %A 2 1 0.5 !
37: CONST HCP_A3 : HF% SN : VA : !

HfSn-16Ber.tdb: HCP_A3, type code %A, sha256 8ebcf7873dc489e2…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : HF% SN : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase
doi:10.1016/j.commatsci.2016.08.042 A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).
assessment that models this phase

HF5SN3_D88 (Hf–Sn)

Id: phase:hf-sn:hf5sn3-d88; status assigned
Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type st:d8-8-mn5si3-hp16; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–2244.34 K, x(Sn) 0.375–0.44444
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:hf-sn:hf5sn3-d88
tdb: tdb:HfSn-12Tan.tdb:HF5SN3_D88, tdb:HfSn-16Ber.tdb:HF5SN3_D88

TDB models of HF5SN3_D88 (2): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: HF5SN3_D88, type code %, sha256 6a3156ac006b45a5…

51: PHASE HF5SN3_D88 % 2 5 3 !
52: CONST HF5SN3_D88 : HF : SN : !

HfSn-16Ber.tdb: HF5SN3_D88, type code %, sha256 8ebcf7873dc489e2…

56: PHASE HF5SN3_D88 % 3 5 3 1 !
57: CONST HF5SN3_D88 : HF : SN : SN VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase
doi:10.1016/j.commatsci.2016.08.042 A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).
assessment that models this phase

HF5SN4 (Hf–Sn)

Id: phase:hf-sn:hf5sn4; status assigned
Structure: Ga4Ti5 · hP18 · P6_3/mcm (193); type st:ga4ti5-hp18; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Hf 0.5556, Sn 0.4444
Stability: stable in 1 of 1 calculated diagram(s): 300–2013.29 K, x(Sn) 0.44444–0.44444
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:hf-sn:hf5sn4
mp: mp:mp-aaabdblz
oqmd: oqmd:oqmd-18591
paper: paper:10.1016/j.calphad.2012.09.003:Hf5Sn4
tdb: tdb:HfSn-12Tan.tdb:HF5SN4

TDB models of HF5SN4 (1): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: HF5SN4, type code %, sha256 6a3156ac006b45a5…

56: PHASE HF5SN4 % 2 5 4 !
57: CONST HF5SN4 : HF : SN : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase; reports values for this phase
doi:10.1007/bf00595382 K. Schubert, H. G. Meissner, M. Pötzschke, W. Rossteutscher, E. Stolz, Einige Strukturdaten metallischer Phasen (7), Naturwissenschaften 49, 57-57 (1962).
cited as the source of values for this phase

HFSN2_C40 (Hf–Sn)

Id: phase:hf-sn:hfsn2-c40; status assigned
Structure: CrSi2 · C40 · hP9 · P6_222 (180); type st:c40-crsi2-hp9; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacjlje and oqmd-30527, space group 180
Stoichiometry: Hf 0.3333, Sn 0.6667
Stability: stable in 2 of 2 calculated diagram(s): 300–1824.66 K, x(Sn) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:hf-sn:hfsn2-c40
mp: mp:mp-aaacjlje
oqmd: oqmd:oqmd-30527
tdb: tdb:HfSn-12Tan.tdb:HFSN2_C40, tdb:HfSn-16Ber.tdb:HFSN2_C40

TDB models of HFSN2_C40 (2): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: HFSN2_C40, type code %, sha256 6a3156ac006b45a5…

61: PHASE HFSN2_C40 % 2 1 2 !
62: CONST HFSN2_C40 : HF : SN : !

HfSn-16Ber.tdb: HFSN2_C40, type code %, sha256 8ebcf7873dc489e2…

61: PHASE HFSN2_C40 % 2 1 2 !
62: CONST HFSN2_C40 : HF : SN : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase
doi:10.1016/j.commatsci.2016.08.042 A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).
assessment that models this phase

LIQUID (Hf–Sn)

Id: phase:hf-sn:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 505.08–4000 K, x(Sn) 0–1
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:hf-sn:liquid
paper: paper:10.1016/j.calphad.2012.09.003:Liquid
tdb: tdb:HfSn-12Tan.tdb:LIQUID, tdb:HfSn-16Ber.tdb:LIQUID

TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written

HfSn-12Tan.tdb: LIQUID, type code %, sha256 6a3156ac006b45a5…

21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : HF SN : !

HfSn-16Ber.tdb: LIQUID, type code %, sha256 8ebcf7873dc489e2…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : HF SN : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.09.003 Cai Tang, Biao Hu, Yong Du, Dongdong Zhao, Peng Zhou, Feng Zheng et al., Thermodynamic modeling of the Hf–Sn and Sn–Y systems, Calphad 39, 91-96 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/j.commatsci.2016.08.042 A. Berche, J.C. Tédenac, P. Jund, Phase diagram and enthalpy of formation of Hf-Ni-Sn, Computational Materials Science 125, 271-277 (2016).
assessment that models this phase

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735970
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 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); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work). 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_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  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}
}