Fe–Pb phases

5 phases (tier A 3, liquid 1, gas 1); 4 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 · Fe–Pb system page · Markdown · field reference

Phases of the Fe–Pb system (5)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:fe-pb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1824.58 K, x(Pb) 0–2e-05	11	2
FCC_A1 phase:fe-pb:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1667.49 K, x(Pb) 0–1	9	2
GAS phase:fe-pb:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 2019.02–2500 K, x(Pb) 0.96684–1	0	1
HCP_A3 phase:fe-pb:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 2 calculated diagram(s)	0	2
LIQUID phase:fe-pb:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 300.62–2500 K, x(Pb) 0–1	11	2

BCC_A2 (Fe–Pb)

Id: phase:fe-pb: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): 300–1824.58 K, x(Pb) 0–2e-05
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-pb:bcc-a2
paper: paper:10.1016/j.tca.2011.06.014:bcc
tdb: tdb:FePb-11Vaa.tdb:BCC_A2, tdb:FePb-87Din-LB.tdb:BCC_A2

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

FePb-11Vaa.tdb: BCC_A2, type code %B, sha256 05c82ebb8d79a2c2…

32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : FE PB : VA : !

FePb-87Din-LB.tdb: BCC_A2, type code %B, sha256 b26c9577ad72412f…

48: PHASE BCC_A2 %B 2 1 3 !
49: CONST BCC_A2 : FE PB : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2011.06.014 I. Vaajamo, P. Taskinen, A thermodynamic assessment of the iron–lead binary system, Thermochimica Acta 524, 56-61 (2011).
assessment that models this phase; reports values for this phase

FCC_A1 (Fe–Pb)

Id: phase:fe-pb: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 2 of 2 calculated diagram(s): 300–1667.49 K, x(Pb) 0–1
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:fe-pb:fcc-a1
paper: paper:10.1016/j.tca.2011.06.014:fcc
tdb: tdb:FePb-11Vaa.tdb:FCC_A1, tdb:FePb-87Din-LB.tdb:FCC_A1

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

FePb-11Vaa.tdb: FCC_A1, type code %A, sha256 05c82ebb8d79a2c2…

27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : FE PB : VA : !

FePb-87Din-LB.tdb: FCC_A1, type code %A, sha256 b26c9577ad72412f…

43: PHASE FCC_A1 %A 2 1 1 !
44: CONST FCC_A1 : FE PB : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2011.06.014 I. Vaajamo, P. Taskinen, A thermodynamic assessment of the iron–lead binary system, Thermochimica Acta 524, 56-61 (2011).
assessment that models this phase; reports values for this phase

GAS (Fe–Pb)

Id: phase:fe-pb:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 2019.02–2500 K, x(Pb) 0.96684–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:fe-pb:gas
tdb: tdb:FePb-87Din-LB.tdb:GAS

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

FePb-87Din-LB.tdb: GAS, type code %, sha256 b26c9577ad72412f…

56: PHASE GAS:G % 1 1 !
57: CONST GAS:G : FE FE2 PB PB2 : !

HCP_A3 (Fe–Pb)

Id: phase:fe-pb: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: not stable in 2 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:fe-pb:hcp-a3
tdb: tdb:FePb-11Vaa.tdb:HCP_A3, tdb:FePb-87Din-LB.tdb:HCP_A3

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

FePb-11Vaa.tdb: HCP_A3, type code %, sha256 05c82ebb8d79a2c2…

37: PHASE HCP_A3 % 2 1 0.5 !
38: CONST HCP_A3 : FE PB : VA : !

FePb-87Din-LB.tdb: HCP_A3, type code %, sha256 b26c9577ad72412f…

53: PHASE HCP_A3 % 2 1 0.5 !
54: CONST HCP_A3 : FE PB : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2011.06.014 I. Vaajamo, P. Taskinen, A thermodynamic assessment of the iron–lead binary system, Thermochimica Acta 524, 56-61 (2011).
assessment that models this phase

LIQUID (Fe–Pb)

Id: phase:fe-pb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300.62–2500 K, x(Pb) 0–1
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:fe-pb:liquid
paper: paper:10.1016/j.tca.2011.06.014:L1, paper:10.1016/j.tca.2011.06.014:L2
tdb: tdb:FePb-11Vaa.tdb:LIQUID, tdb:FePb-87Din-LB.tdb:LIQUID

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

FePb-11Vaa.tdb: LIQUID, type code %, sha256 05c82ebb8d79a2c2…

22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : FE PB : !

FePb-87Din-LB.tdb: LIQUID, type code %, sha256 b26c9577ad72412f…

38: PHASE LIQUID:L % 1 1 !
39: CONST LIQUID:L : FE PB : !

Example references (1 of 1; assessments first):

doi:10.1016/j.tca.2011.06.014 I. Vaajamo, P. Taskinen, A thermodynamic assessment of the iron–lead binary system, Thermochimica Acta 524, 56-61 (2011).
assessment that models this phase; reports 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}
}