H–Sr phases

7 phases (tier A 4, liquid 1, gas 1, needs_review 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 · H–Sr system page · Markdown · field reference

Phases of the H–Sr system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:h-sr:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 820–1158.5 K, x(H) 0–0.4336	0	1
FCC_A1 phase:h-sr:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–823.01 K, x(H) 0–0.05457	0	1
GAS phase:h-sr:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 300–2500 K, x(H) 0–1	0	1
HCP_A3 phase:h-sr:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 515.1–897.96 K, x(H) 0.01676–0.21457	0	1
LIQUID phase:h-sr:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1049.06–2009.03 K, x(H) 0–0.47347	0	1
SRH2_BETA phase:h-sr:srh2-beta		needs_review	stable in 1 of 1 calculated diagram(s): 1129.52–1220.03 K, x(H) 0.66667–0.66667	1	1
SRH2_C37 phase:h-sr:srh2-c37	Co2Si · C37 · oP12 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1129.52 K, x(H) 0.66667–0.66667	4	1

BCC_A2 (H–Sr)

Id: phase:h-sr: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 1 of 1 calculated diagram(s): 820–1158.5 K, x(H) 0–0.4336
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-sr:bcc-a2
tdb: tdb:SrH-12Che.tdb:BCC_A2

TDB models of BCC_A2 (1): PHASE and CONSTITUENT statements as written

SrH-12Che.tdb: BCC_A2, type code %B, sha256 57c5fa217cf9f14a…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : SR : H VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.03.001 Chong Chen, Man Wang, Yong Du, Qiannan Gao, Biao Hu, Shuhong Liu, Thermodynamic modeling of the Sr–X (X=H, Li, Na, Sc) systems, Calphad 38, 17-22 (2012).
assessment that models this phase

FCC_A1 (H–Sr)

Id: phase:h-sr:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–823.01 K, x(H) 0–0.05457
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-sr:fcc-a1
tdb: tdb:SrH-12Che.tdb:FCC_A1

TDB models of FCC_A1 (1): PHASE and CONSTITUENT statements as written

SrH-12Che.tdb: FCC_A1, type code %A, sha256 57c5fa217cf9f14a…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : SR : H VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.03.001 Chong Chen, Man Wang, Yong Du, Qiannan Gao, Biao Hu, Shuhong Liu, Thermodynamic modeling of the Sr–X (X=H, Li, Na, Sc) systems, Calphad 38, 17-22 (2012).
assessment that models this phase

GAS (H–Sr)

Id: phase:h-sr:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2500 K, x(H) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-sr:gas
tdb: tdb:SrH-12Che.tdb:GAS

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

SrH-12Che.tdb: GAS, type code %, sha256 57c5fa217cf9f14a…

55: PHASE GAS:G % 1 1 !
56: CONST GAS:G : H H2 SR SR2 : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.03.001 Chong Chen, Man Wang, Yong Du, Qiannan Gao, Biao Hu, Shuhong Liu, Thermodynamic modeling of the Sr–X (X=H, Li, Na, Sc) systems, Calphad 38, 17-22 (2012).
assessment that models this phase

HCP_A3 (H–Sr)

Id: phase:h-sr: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 1 of 1 calculated diagram(s): 515.1–897.96 K, x(H) 0.01676–0.21457
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-sr:hcp-a3
tdb: tdb:SrH-12Che.tdb:HCP_A3

TDB models of HCP_A3 (1): PHASE and CONSTITUENT statements as written

SrH-12Che.tdb: HCP_A3, type code %A, sha256 57c5fa217cf9f14a…

42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : SR : H VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.03.001 Chong Chen, Man Wang, Yong Du, Qiannan Gao, Biao Hu, Shuhong Liu, Thermodynamic modeling of the Sr–X (X=H, Li, Na, Sc) systems, Calphad 38, 17-22 (2012).
assessment that models this phase

LIQUID (H–Sr)

Id: phase:h-sr:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1049.06–2009.03 K, x(H) 0–0.47347
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-sr:liquid
tdb: tdb:SrH-12Che.tdb:LIQUID

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

SrH-12Che.tdb: LIQUID, type code %, sha256 57c5fa217cf9f14a…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : H SR : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.03.001 Chong Chen, Man Wang, Yong Du, Qiannan Gao, Biao Hu, Shuhong Liu, Thermodynamic modeling of the Sr–X (X=H, Li, Na, Sc) systems, Calphad 38, 17-22 (2012).
assessment that models this phase

SRH2_BETA (H–Sr)

Id: phase:h-sr:srh2-beta; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
Candidate (dft_mp): Pnma (62) — on-hull MP SrH2 at x(SR)=0.3333
Candidate (dft_oqmd): Pnma (62) — on-hull OQMD H2 Sr1 at x(SR)=0.3333
Candidate (sgte_mmc2): SrH2 — Hallstedt 2025 mmc2 row for SRH2_BETA: SrH2-beta
Stoichiometry: H 0.6667, Sr 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 1129.52–1220.03 K, x(H) 0.66667–0.66667
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:h-sr:srh2-beta
paper: paper:10.1016/j.calphad.2012.03.001:βSrH2
tdb: tdb:SrH-12Che.tdb:SRH2_BETA

TDB models of SRH2_BETA (1): PHASE and CONSTITUENT statements as written

SrH-12Che.tdb: SRH2_BETA, type code %, sha256 57c5fa217cf9f14a…

52: PHASE SRH2_BETA % 2 1 2 !
53: CONST SRH2_BETA : SR : H : !

Example references (2 of 2; assessments first):

doi:10.1016/j.calphad.2012.03.001 Chong Chen, Man Wang, Yong Du, Qiannan Gao, Biao Hu, Shuhong Liu, Thermodynamic modeling of the Sr–X (X=H, Li, Na, Sc) systems, Calphad 38, 17-22 (2012).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(80)90144-7 D.T. Peterson, S.O. Nelson, Equilibrium hydrogen pressures in the strontium-hydrogen system, Journal of the Less Common Metals 72, 251-256 (1980).
cited as the source of values for this phase

SRH2_C37 (H–Sr)

Id: phase:h-sr:srh2-c37; status assigned
Structure: Co2Si · C37 · oP12 · Pnma (62); type st:c37-co2si-op12; tier A: standard phase name; confidence high
Stoichiometry: H 0.6667, Sr 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1129.52 K, x(H) 0.66667–0.66667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:h-sr:srh2-c37
paper: paper:10.1016/j.calphad.2012.03.001:αSrH2
tdb: tdb:SrH-12Che.tdb:SRH2_C37

TDB models of SRH2_C37 (1): PHASE and CONSTITUENT statements as written

SrH-12Che.tdb: SRH2_C37, type code %, sha256 57c5fa217cf9f14a…

47: PHASE SRH2_C37 % 2 1 2 !
48: CONST SRH2_C37 : SR : H : !

Example references (3 of 3; assessments first):

doi:10.1016/j.calphad.2012.03.001 Chong Chen, Man Wang, Yong Du, Qiannan Gao, Biao Hu, Shuhong Liu, Thermodynamic modeling of the Sr–X (X=H, Li, Na, Sc) systems, Calphad 38, 17-22 (2012).
assessment that models this phase; reports values for this phase
doi:10.1002/zaac.19633240302 P. Ehrlich, K. Peik, E. Koch, Thermochemische Messungen an den Hydridhalogeniden der Erdalkalimetalle, Zeitschrift anorg allge chemie 324, 113-128 (1963).
cited as the source of values for this phase
doi:10.1016/0022-5088(80)90144-7 D.T. Peterson, S.O. Nelson, Equilibrium hydrogen pressures in the strontium-hydrogen system, Journal of the Less Common Metals 72, 251-256 (1980).
cited as the source of values for 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}
}