Pb–Zr phases

7 phases (tier A 4, liquid 1, needs_review 2); 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 · Pb–Zr system page · Markdown · field reference

Phases of the Pb–Zr system (7)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:pb-zr:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1135.28–3662.85 K, x(Zr) 0.87036–1	10	1
FCC_A1 phase:pb-zr:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–631 K, x(Zr) 0–0.03331	0	1
HCP_A3 phase:pb-zr:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1210.28 K, x(Zr) 0.94268–1	5	1
LIQUID phase:pb-zr:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 571–4000 K, x(Zr) 0–1	5	1
PB2ZR phase:pb-zr:pb2zr		needs_review	stable in 1 of 1 calculated diagram(s): 300–1546.68 K, x(Zr) 0.33333–0.33333	0	1
PB3ZR5_D88 phase:pb-zr:pb3zr5-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 770.7–2242.22 K, x(Zr) 0.625–0.625	5	1
PBZR4_A15 phase:pb-zr:pbzr4-a15		needs_review	stable in 1 of 1 calculated diagram(s): 300–1516.79 K, x(Zr) 0.8–0.8	7	1

BCC_A2 (Pb–Zr)

Id: phase:pb-zr: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): 1135.28–3662.85 K, x(Zr) 0.87036–1
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pb-zr:bcc-a2
paper: paper:10.1016/s0364-5916(98)00039-x:β
tdb: tdb:PbZr-98Dix.tdb:BCC_A2

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

PbZr-98Dix.tdb: BCC_A2, type code %B, sha256 1620ca23b0d702d2…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : PB ZR% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(98)00039-X P.R. Dixon, B.B. Argent, T.G. Chart, Calphad, 22, 397-416(1998).
assessment that models this phase; reports values for this phase

FCC_A1 (Pb–Zr)

Id: phase:pb-zr: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): 300–631 K, x(Zr) 0–0.03331
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pb-zr:fcc-a1
tdb: tdb:PbZr-98Dix.tdb:FCC_A1

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

PbZr-98Dix.tdb: FCC_A1, type code %A, sha256 1620ca23b0d702d2…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : PB% ZR : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(98)00039-X P.R. Dixon, B.B. Argent, T.G. Chart, Calphad, 22, 397-416(1998).
assessment that models this phase

HCP_A3 (Pb–Zr)

Id: phase:pb-zr: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): 300–1210.28 K, x(Zr) 0.94268–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pb-zr:hcp-a3
paper: paper:10.1016/s0364-5916(98)00039-x:α
tdb: tdb:PbZr-98Dix.tdb:HCP_A3

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

PbZr-98Dix.tdb: HCP_A3, type code %A, sha256 1620ca23b0d702d2…

41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : PB ZR% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(98)00039-X P.R. Dixon, B.B. Argent, T.G. Chart, Calphad, 22, 397-416(1998).
assessment that models this phase; reports values for this phase

LIQUID (Pb–Zr)

Id: phase:pb-zr:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 571–4000 K, x(Zr) 0–1
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pb-zr:liquid
paper: paper:10.1016/s0364-5916(98)00039-x:liquid
tdb: tdb:PbZr-98Dix.tdb:LIQUID

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

PbZr-98Dix.tdb: LIQUID, type code %, sha256 1620ca23b0d702d2…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : PB ZR : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(98)00039-X P.R. Dixon, B.B. Argent, T.G. Chart, Calphad, 22, 397-416(1998).
assessment that models this phase; reports values for this phase

PB2ZR (Pb–Zr)

Id: phase:pb-zr:pb2zr; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Pb2Zr) — Hallstedt 2025 mmc2 row for PB2ZR: Pb2Zr
Stoichiometry: Pb 0.6667, Zr 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1546.68 K, x(Zr) 0.33333–0.33333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:pb-zr:pb2zr
tdb: tdb:PbZr-98Dix.tdb:PB2ZR

TDB models of PB2ZR (1): PHASE and CONSTITUENT statements as written

PbZr-98Dix.tdb: PB2ZR, type code %, sha256 1620ca23b0d702d2…

46: PHASE PB2ZR % 2 2 1 !
47: CONST PB2ZR : PB : ZR : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(98)00039-X P.R. Dixon, B.B. Argent, T.G. Chart, Calphad, 22, 397-416(1998).
assessment that models this phase

PB3ZR5_D88 (Pb–Zr)

Id: phase:pb-zr:pb3zr5-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
Stoichiometry: Pb 0.3750, Zr 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 770.7–2242.22 K, x(Zr) 0.625–0.625
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pb-zr:pb3zr5-d88
paper: paper:10.1016/s0364-5916(98)00039-x:Zr5Pb3
tdb: tdb:PbZr-98Dix.tdb:PB3ZR5_D88

TDB models of PB3ZR5_D88 (1): PHASE and CONSTITUENT statements as written

PbZr-98Dix.tdb: PB3ZR5_D88, type code %, sha256 1620ca23b0d702d2…

51: PHASE PB3ZR5_D88 % 2 3 5 !
52: CONST PB3ZR5_D88 : PB : ZR : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(98)00039-X P.R. Dixon, B.B. Argent, T.G. Chart, Calphad, 22, 397-416(1998).
assessment that models this phase; reports values for this phase

PBZR4_A15 (Pb–Zr)

Id: phase:pb-zr:pbzr4-a15; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_A15; stoichiometry_contradicts_A15:PbZr-98Dix.tdb
Candidate (literature_printed): Cr3Si · cP8 — printed with a label mapped to this phase
Candidate (name_token): Cr3Si · A15 · cP8 · Pm-3n (223) — Strukturbericht/word 'A15' in the TDB name
Candidate (sgte_mmc2): Cr3Si · A15 · cP8 · Pm-3n (223) — Hallstedt 2025 mmc2 row for PBZR4_A15: PbZr4
Candidate (tdb_comment): Cr3Si · cP8 · Pm-3n — PbZr-98Dix.tdb: 'Prototype Cr3Si (cP8, Pm-3n)'
Stoichiometry: Pb 0.2000, Zr 0.8000
Stability: stable in 1 of 1 calculated diagram(s): 300–1516.79 K, x(Zr) 0.8–0.8
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:pb-zr:pbzr4-a15
paper: paper:10.1016/s0364-5916(98)00039-x:Zr4Pb
tdb: tdb:PbZr-98Dix.tdb:PBZR4_A15

TDB models of PBZR4_A15 (1): PHASE and CONSTITUENT statements as written

PbZr-98Dix.tdb: PBZR4_A15, type code %, sha256 1620ca23b0d702d2…

56: PHASE PBZR4_A15 % 2 1 4 !
57: CONST PBZR4_A15 : PB : ZR : !

Example references (1 of 1; assessments first):

doi:10.1016/S0364-5916(98)00039-X P.R. Dixon, B.B. Argent, T.G. Chart, Calphad, 22, 397-416(1998).
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}
}