# Pb–Y phases

> Pb–Y system: 8 phases (tier A 6, tier C 1, liquid 1); 8 stable in a calculated diagram in the ORCHID phase registry, with names, structure type when the stored evidence supports an assignment under the stated tier rules, calculated stability, verbatim TDB PHASE/CONSTITUENT statements and example references.

HTML: https://data.orchid-project.org/phases/pages/PB-Y.html · Markdown: https://data.orchid-project.org/phases/pages/PB-Y.md

8 phases (tier A 6, tier C 1, liquid 1); 8 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](https://orchid-project.org/phases/?q=PB-Y) · [full JSON](https://data.orchid-project.org/phases/systems/PB-Y.json) · [Pb–Y system page](https://data.orchid-project.org/systems/PB-Y.html) · [Markdown](https://data.orchid-project.org/phases/pages/PB-Y.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Pb–Y system (8)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-pb-y-bcc-a2); _phase:pb-y:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1736.2–2022.65 K, x(Y) 0.98871–1 | 0 | 1 |
| [FCC_A1](#phase-pb-y-fcc-a1); _phase:pb-y:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–600.58 K, x(Y) 0–0 | 0 | 1 |
| [HCP_A3](#phase-pb-y-hcp-a3); _phase:pb-y:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1751.15 K, x(Y) 0.9801–1 | 0 | 1 |
| [LIQUID](#phase-pb-y-liquid); _phase:pb-y:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 600.58–2500 K, x(Y) 0–1 | 0 | 1 |
| [PB2Y_C49](#phase-pb-y-pb2y-c49); _phase:pb-y:pb2y-c49_ | ZrSi2 · C49 · oC12 · Cmcm (63) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1192.93 K, x(Y) 0.33333–0.33333 | 0 | 1 |
| [PB3Y_L12](#phase-pb-y-pb3y-l12); _phase:pb-y:pb3y-l12_ | AuCu3 · L1_2 · cP4 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1066.01 K, x(Y) 0.25–0.25 | 0 | 1 |
| [PB3Y5_D88](#phase-pb-y-pb3y5-d88); _phase:pb-y:pb3y5-d88_ | Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1958 K, x(Y) 0.625–0.625 | 0 | 1 |
| [PB4Y5](#phase-pb-y-pb4y5); _phase:pb-y:pb4y5_ | Gd5Si4 · oP36 · Pnma (62) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1835.14 K, x(Y) 0.55556–0.55556 | 0 | 1 |

## BCC_A2 (Pb–Y)

- Id: `phase:pb-y: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): 1736.2–2022.65 K, x(Y) 0.98871–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pb-y:bcc-a2)

Names (2): _corpus: _corpus:phase:pb-y:bcc-a2  
_tdb: _tdb:PbY-93Vas.tdb:BCC_A2  


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

[PbY-93Vas.tdb](https://orchid-project.org/data/databases/sgte-binary/PbY-93Vas.tdb): BCC_A2, type code %B, sha256 `56e02b1331b12a11…`

~~~~text
41: PHASE BCC_A2 %B 2 1 3 !
42: CONST BCC_A2 : PB Y% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/BF02667801](https://doi.org/10.1007/BF02667801) V. Vassiliev, M. Gambino, J.P. Bros, G. Borzone, G. Cacciamani, R. Ferro, J. Phase Equilib., 14, 142-49(1993).  
_assessment that models this phase_

## FCC_A1 (Pb–Y)

- Id: `phase:pb-y: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): 300–600.58 K, x(Y) 0–0
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pb-y:fcc-a1)

Names (2): _corpus: _corpus:phase:pb-y:fcc-a1  
_tdb: _tdb:PbY-93Vas.tdb:FCC_A1  


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

[PbY-93Vas.tdb](https://orchid-project.org/data/databases/sgte-binary/PbY-93Vas.tdb): FCC_A1, type code %A, sha256 `56e02b1331b12a11…`

~~~~text
36: PHASE FCC_A1 %A 2 1 1 !
37: CONST FCC_A1 : PB% Y : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/BF02667801](https://doi.org/10.1007/BF02667801) V. Vassiliev, M. Gambino, J.P. Bros, G. Borzone, G. Cacciamani, R. Ferro, J. Phase Equilib., 14, 142-49(1993).  
_assessment that models this phase_

## HCP_A3 (Pb–Y)

- Id: `phase:pb-y: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): 300–1751.15 K, x(Y) 0.9801–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pb-y:hcp-a3)

Names (2): _corpus: _corpus:phase:pb-y:hcp-a3  
_tdb: _tdb:PbY-93Vas.tdb:HCP_A3  


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

[PbY-93Vas.tdb](https://orchid-project.org/data/databases/sgte-binary/PbY-93Vas.tdb): HCP_A3, type code %A, sha256 `56e02b1331b12a11…`

~~~~text
46: PHASE HCP_A3 %A 2 1 0.5 !
47: CONST HCP_A3 : PB Y% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/BF02667801](https://doi.org/10.1007/BF02667801) V. Vassiliev, M. Gambino, J.P. Bros, G. Borzone, G. Cacciamani, R. Ferro, J. Phase Equilib., 14, 142-49(1993).  
_assessment that models this phase_

## LIQUID (Pb–Y)

- Id: `phase:pb-y:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 600.58–2500 K, x(Y) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pb-y:liquid)

Names (2): _corpus: _corpus:phase:pb-y:liquid  
_tdb: _tdb:PbY-93Vas.tdb:LIQUID  


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

[PbY-93Vas.tdb](https://orchid-project.org/data/databases/sgte-binary/PbY-93Vas.tdb): LIQUID, type code %, sha256 `56e02b1331b12a11…`

~~~~text
31: PHASE LIQUID:L % 1 1 !
32: CONST LIQUID:L : PB Y : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/BF02667801](https://doi.org/10.1007/BF02667801) V. Vassiliev, M. Gambino, J.P. Bros, G. Borzone, G. Cacciamani, R. Ferro, J. Phase Equilib., 14, 142-49(1993).  
_assessment that models this phase_

## PB2Y_C49 (Pb–Y)

- Id: `phase:pb-y:pb2y-c49`; status `assigned`
- Structure: ZrSi2 · C49 · oC12 · Cmcm (63); type `st:c49-zrsi2-oc12`; tier A: standard phase name; confidence high
- Stoichiometry: Pb 0.6667, Y 0.3333
- Stability: stable in 1 of 1 calculated diagram(s): 300–1192.93 K, x(Y) 0.33333–0.33333
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pb-y:pb2y-c49)

Names (2): _corpus: _corpus:phase:pb-y:pb2y-c49  
_tdb: _tdb:PbY-93Vas.tdb:PB2Y_C49  


### TDB models of PB2Y_C49 (1): PHASE and CONSTITUENT statements as written

[PbY-93Vas.tdb](https://orchid-project.org/data/databases/sgte-binary/PbY-93Vas.tdb): PB2Y_C49, type code %, sha256 `56e02b1331b12a11…`

~~~~text
56: PHASE PB2Y_C49 % 2 2 1 !
57: CONST PB2Y_C49 : PB : Y : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/BF02667801](https://doi.org/10.1007/BF02667801) V. Vassiliev, M. Gambino, J.P. Bros, G. Borzone, G. Cacciamani, R. Ferro, J. Phase Equilib., 14, 142-49(1993).  
_assessment that models this phase_

## PB3Y_L12 (Pb–Y)

- Id: `phase:pb-y:pb3y-l12`; status `assigned`
- Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type `st:l1-2-aucu3-cp4`; tier A: standard phase name; confidence high
- Stoichiometry: Pb 0.7500, Y 0.2500
- Stability: stable in 1 of 1 calculated diagram(s): 300–1066.01 K, x(Y) 0.25–0.25
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pb-y:pb3y-l12)

Names (2): _corpus: _corpus:phase:pb-y:pb3y-l12  
_tdb: _tdb:PbY-93Vas.tdb:PB3Y_L12  


### TDB models of PB3Y_L12 (1): PHASE and CONSTITUENT statements as written

[PbY-93Vas.tdb](https://orchid-project.org/data/databases/sgte-binary/PbY-93Vas.tdb): PB3Y_L12, type code %, sha256 `56e02b1331b12a11…`

~~~~text
51: PHASE PB3Y_L12 % 2 3 1 !
52: CONST PB3Y_L12 : PB : Y : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/BF02667801](https://doi.org/10.1007/BF02667801) V. Vassiliev, M. Gambino, J.P. Bros, G. Borzone, G. Cacciamani, R. Ferro, J. Phase Equilib., 14, 142-49(1993).  
_assessment that models this phase_

## PB3Y5_D88 (Pb–Y)

- Id: `phase:pb-y:pb3y5-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
- Caveat: DFT agrees: on-hull mp-aaacppvo and oqmd-30931, space group 193
- Stoichiometry: Pb 0.3750, Y 0.6250
- Stability: stable in 1 of 1 calculated diagram(s): 300–1958 K, x(Y) 0.625–0.625
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pb-y:pb3y5-d88)

Names (4): _corpus: _corpus:phase:pb-y:pb3y5-d88  
_mp: _mp:mp-aaacppvo  
_oqmd: _oqmd:oqmd-30931  
_tdb: _tdb:PbY-93Vas.tdb:PB3Y5_D88  


### TDB models of PB3Y5_D88 (1): PHASE and CONSTITUENT statements as written

[PbY-93Vas.tdb](https://orchid-project.org/data/databases/sgte-binary/PbY-93Vas.tdb): PB3Y5_D88, type code %, sha256 `56e02b1331b12a11…`

~~~~text
66: PHASE PB3Y5_D88 % 2 3 5 !
67: CONST PB3Y5_D88 : PB : Y : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/BF02667801](https://doi.org/10.1007/BF02667801) V. Vassiliev, M. Gambino, J.P. Bros, G. Borzone, G. Cacciamani, R. Ferro, J. Phase Equilib., 14, 142-49(1993).  
_assessment that models this phase_

## PB4Y5 (Pb–Y)

- Id: `phase:pb-y:pb4y5`; status `assigned`
- Structure: Gd5Si4 · oP36 · Pnma (62); type `st:gd5si4-op36`; 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](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Pb 0.4444, Y 0.5556
- Stability: stable in 1 of 1 calculated diagram(s): 300–1835.14 K, x(Y) 0.55556–0.55556
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pb-y:pb4y5)

Names (2): _corpus: _corpus:phase:pb-y:pb4y5  
_tdb: _tdb:PbY-93Vas.tdb:PB4Y5  


### TDB models of PB4Y5 (1): PHASE and CONSTITUENT statements as written

[PbY-93Vas.tdb](https://orchid-project.org/data/databases/sgte-binary/PbY-93Vas.tdb): PB4Y5, type code %, sha256 `56e02b1331b12a11…`

~~~~text
61: PHASE PB4Y5 % 2 4 5 !
62: CONST PB4Y5 : PB : Y : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1007/BF02667801](https://doi.org/10.1007/BF02667801) V. Vassiliev, M. Gambino, J.P. Bros, G. Borzone, G. Cacciamani, R. Ferro, J. Phase Equilib., 14, 142-49(1993).  
_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). https://doi.org/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). https://doi.org/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.

```bibtex
@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}
}
```

---

Derived data CC BY 4.0 ([licence](https://creativecommons.org/licenses/by/4.0/)): cite the ORCHID phase registry and the sources named on the page (TDB assessments, Hallstedt 2025, Materials Project, OQMD). TDB statements are quoted as written; parameter expressions are not reproduced. Field reference: [SCHEMA.md](https://data.orchid-project.org/phases/SCHEMA.md). Machine-readable guide: [llms.txt](https://data.orchid-project.org/llms.txt).