Be–Fe phases

7 phases (tier A 5, tier C 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 · Be–Fe system page · Markdown · field reference

Phases of the Be–Fe system (7)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_B2 phase:be-fe:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1810.95 K, x(Fe) 0–1	1
BE2FE_C14 phase:be-fe:be2fe-c14	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1835.86 K, x(Fe) 0.22432–0.49529	1
BE5FE_C15B phase:be-fe:be5fe-c15b	AuBe5 · C15_b · cF24 · F-43m (216)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1125.59–1811.7 K, x(Fe) 0.07867–0.19	1
BE9FE phase:be-fe:be9fe	Be17Rh2 · hP19 · P-6m2 (187)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1346.26 K, x(Fe) 0.1–0.1	1
FCC_A1 phase:be-fe:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1184.81–1809.62 K, x(Fe) 0.97327–1	1
HCP_A3 phase:be-fe:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1550.95 K, x(Fe) 0–1e-05	1
LIQUID phase:be-fe:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1360–2500 K, x(Fe) 0–1	1

BCC_B2 (Be–Fe)

Id: phase:be-fe:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in BeFe-04Oht.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–1810.95 K, x(Fe) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-fe:bcc-b2
tdb: tdb:BeFe-04Oht.tdb:BCC_B2

TDB models of BCC_B2 (1): PHASE and CONSTITUENT statements as written

BeFe-04Oht.tdb: BCC_B2, type code %B, sha256 8b95c578aa028926…

39: PHASE BCC_B2 %B 3 0.5 0.5 3 !
40: CONST BCC_B2 : BE% FE : BE FE% : VA : !

Example references (1 of 1; assessments first):

doi:10.2320/matertrans.45.1499 Hiroshi Ohtani, Yoshiko Takeshita, Mitsuhiro Hasebe, Effect of the Order-Disorder Transition of the bcc Structure on the Solubility of Be in the Fe-Be Binary System, Mater. Trans. 45, 1499-1506 (2004).
assessment that models this phase

BE2FE_C14 (Be–Fe)

Id: phase:be-fe:be2fe-c14; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in BeFe-04Oht.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–1835.86 K, x(Fe) 0.22432–0.49529
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-fe:be2fe-c14
tdb: tdb:BeFe-04Oht.tdb:BE2FE_C14

TDB models of BE2FE_C14 (1): PHASE and CONSTITUENT statements as written

BeFe-04Oht.tdb: BE2FE_C14, type code %, sha256 8b95c578aa028926…

59: PHASE BE2FE_C14 % 2 2 1 !
60: CONST BE2FE_C14 : BE% FE : BE FE% : !

Example references (1 of 1; assessments first):

doi:10.2320/matertrans.45.1499 Hiroshi Ohtani, Yoshiko Takeshita, Mitsuhiro Hasebe, Effect of the Order-Disorder Transition of the bcc Structure on the Solubility of Be in the Fe-Be Binary System, Mater. Trans. 45, 1499-1506 (2004).
assessment that models this phase

BE5FE_C15B (Be–Fe)

Id: phase:be-fe:be5fe-c15b; status assigned
Structure: AuBe5 · C15_b · cF24 · F-43m (216); type st:c15-b-aube5-cf24; tier A: standard phase name; confidence high
Caveat: partitioned order/disorder model in BeFe-04Oht.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 1125.59–1811.7 K, x(Fe) 0.07867–0.19
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-fe:be5fe-c15b
tdb: tdb:BeFe-04Oht.tdb:BE5FE_C15B

TDB models of BE5FE_C15B (1): PHASE and CONSTITUENT statements as written

BeFe-04Oht.tdb: BE5FE_C15B, type code %, sha256 8b95c578aa028926…

54: PHASE BE5FE_C15B % 2 3 1 !
55: CONST BE5FE_C15B : BE% FE : BE FE% : !

Example references (1 of 1; assessments first):

doi:10.2320/matertrans.45.1499 Hiroshi Ohtani, Yoshiko Takeshita, Mitsuhiro Hasebe, Effect of the Order-Disorder Transition of the bcc Structure on the Solubility of Be in the Fe-Be Binary System, Mater. Trans. 45, 1499-1506 (2004).
assessment that models this phase

BE9FE (Be–Fe)

Id: phase:be-fe:be9fe; status assigned
Structure: Be17Rh2 · hP19 · P-6m2 (187); type st:be17rh2-hp19; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Be 0.9000, Fe 0.1000
Stability: stable in 1 of 1 calculated diagram(s): 300–1346.26 K, x(Fe) 0.1–0.1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-fe:be9fe
tdb: tdb:BeFe-04Oht.tdb:BE9FE

TDB models of BE9FE (1): PHASE and CONSTITUENT statements as written

BeFe-04Oht.tdb: BE9FE, type code %, sha256 8b95c578aa028926…

49: PHASE BE9FE % 2 9 1 !
50: CONST BE9FE : BE : FE : !

Example references (1 of 1; assessments first):

doi:10.2320/matertrans.45.1499 Hiroshi Ohtani, Yoshiko Takeshita, Mitsuhiro Hasebe, Effect of the Order-Disorder Transition of the bcc Structure on the Solubility of Be in the Fe-Be Binary System, Mater. Trans. 45, 1499-1506 (2004).
assessment that models this phase

FCC_A1 (Be–Fe)

Id: phase:be-fe: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): 1184.81–1809.62 K, x(Fe) 0.97327–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-fe:fcc-a1
tdb: tdb:BeFe-04Oht.tdb:FCC_A1

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

BeFe-04Oht.tdb: FCC_A1, type code %A, sha256 8b95c578aa028926…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : BE FE% : VA : !

Example references (1 of 1; assessments first):

doi:10.2320/matertrans.45.1499 Hiroshi Ohtani, Yoshiko Takeshita, Mitsuhiro Hasebe, Effect of the Order-Disorder Transition of the bcc Structure on the Solubility of Be in the Fe-Be Binary System, Mater. Trans. 45, 1499-1506 (2004).
assessment that models this phase

HCP_A3 (Be–Fe)

Id: phase:be-fe: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): 300–1550.95 K, x(Fe) 0–1e-05
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-fe:hcp-a3
tdb: tdb:BeFe-04Oht.tdb:HCP_A3

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

BeFe-04Oht.tdb: HCP_A3, type code %A, sha256 8b95c578aa028926…

44: PHASE HCP_A3 %A 2 1 0.5 !
45: CONST HCP_A3 : BE% FE : VA : !

Example references (1 of 1; assessments first):

doi:10.2320/matertrans.45.1499 Hiroshi Ohtani, Yoshiko Takeshita, Mitsuhiro Hasebe, Effect of the Order-Disorder Transition of the bcc Structure on the Solubility of Be in the Fe-Be Binary System, Mater. Trans. 45, 1499-1506 (2004).
assessment that models this phase

LIQUID (Be–Fe)

Id: phase:be-fe:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1360–2500 K, x(Fe) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:be-fe:liquid
tdb: tdb:BeFe-04Oht.tdb:LIQUID

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

BeFe-04Oht.tdb: LIQUID, type code %, sha256 8b95c578aa028926…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : BE FE : !

Example references (1 of 1; assessments first):

doi:10.2320/matertrans.45.1499 Hiroshi Ohtani, Yoshiko Takeshita, Mitsuhiro Hasebe, Effect of the Order-Disorder Transition of the bcc Structure on the Solubility of Be in the Fe-Be Binary System, Mater. Trans. 45, 1499-1506 (2004).
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}
}