# Mg–Pb phases > Mg–Pb system: 5 phases (tier A 4, liquid 1); 4 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/MG-PB.html · Markdown: https://data.orchid-project.org/phases/pages/MG-PB.md 5 phases (tier A 4, liquid 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](https://orchid-project.org/phases/?q=MG-PB) · [full JSON](https://data.orchid-project.org/phases/systems/MG-PB.json) · [Mg–Pb system page](https://data.orchid-project.org/systems/MG-PB.html) · [Markdown](https://data.orchid-project.org/phases/pages/MG-PB.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md) Table: Phases of the Mg–Pb system (5) | Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models | |---|---|---|---|---:|---:| | [BCC_A2](#phase-mg-pb-bcc-a2); _phase:mg-pb:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | not stable in 3 calculated diagram(s) | 0 | 3 | | [FCC_A1](#phase-mg-pb-fcc-a1); _phase:mg-pb:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–601.06 K, x(Pb) 0.93764–1 | 7 | 3 | | [HCP_A3](#phase-mg-pb-hcp-a3); _phase:mg-pb:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–927 K, x(Pb) 0–0.0871 | 18 | 3 | | [LIQUID](#phase-mg-pb-liquid); _phase:mg-pb:liquid_ | liquid | liquid | stable in 3 of 3 calculated diagram(s): 517.29–2500 K, x(Pb) 0–1 | 73 | 3 | | [MG2PB_C1](#phase-mg-pb-mg2pb-c1); _phase:mg-pb:mg2pb-c1_ | CaF2 · C1 · cF12 · Fm-3m (225) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–823.81 K, x(Pb) 0.33333–0.33333 | 39 | 3 | ## BCC_A2 (Mg–Pb) - Id: `phase:mg-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: not stable in 3 calculated diagram(s) - Literature: 0 values (0 accepted) from 0 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-pb:bcc-a2) Names (4): _corpus: _corpus:phase:mg-pb:bcc-a2 _tdb: _tdb:MgPb-14Zha-ass.tdb:BCC_A2, tdb:MgPb-14Zha-sub.tdb:BCC_A2, tdb:MgPb-21Deb.tdb:BCC_A2 ### TDB models of BCC_A2 (3): PHASE and CONSTITUENT statements as written [MgPb-14Zha-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-ass.tdb): BCC_A2, type code %B, sha256 `85fd9842fb3b047b…` ~~~~text 40: PHASE BCC_A2 %B 2 1 3 ! 41: CONST BCC_A2 : MG PB : VA : ! ~~~~ [MgPb-14Zha-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-sub.tdb): BCC_A2, type code %B, sha256 `715ddff6aaa4430b…` ~~~~text 36: PHASE BCC_A2 %B 2 1 3 ! 37: CONST BCC_A2 : MG PB : VA : ! ~~~~ [MgPb-21Deb.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-21Deb.tdb): BCC_A2, type code %B, sha256 `c150e3ea46f0693a…` ~~~~text 42: PHASE BCC_A2 %B 2 1 3 ! 43: CONST BCC_A2 : MG PB : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.1016/j.jallcom.2020.158396](https://doi.org/10.1016/j.jallcom.2020.158396) A. Dębski, W. Gierlotka, S. Terlicka, W. Gąsior, On the Mg-Pb system. Calorimetric studies and thermodynamic calculations, Journal of Alloys and Compounds 861, 158396 (2021). _assessment that models this phase_ - [doi:10.2298/JMMB130824017Z](https://doi.org/10.2298/JMMB130824017Z) F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014). _assessment that models this phase_ ## FCC_A1 (Mg–Pb) - Id: `phase:mg-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 3 of 3 calculated diagram(s): 300–601.06 K, x(Pb) 0.93764–1 - Literature: 7 values (7 accepted) from 1 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-pb:fcc-a1) Names (5): _corpus: _corpus:phase:mg-pb:fcc-a1 _paper: _paper:10.2298/jmmb130824017z:(Pb) _tdb: _tdb:MgPb-14Zha-ass.tdb:FCC_A1, tdb:MgPb-14Zha-sub.tdb:FCC_A1, tdb:MgPb-21Deb.tdb:FCC_A1 ### TDB models of FCC_A1 (3): PHASE and CONSTITUENT statements as written [MgPb-14Zha-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-ass.tdb): FCC_A1, type code %A, sha256 `85fd9842fb3b047b…` ~~~~text 35: PHASE FCC_A1 %A 2 1 1 ! 36: CONST FCC_A1 : MG PB% : VA : ! ~~~~ [MgPb-14Zha-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-sub.tdb): FCC_A1, type code %A, sha256 `715ddff6aaa4430b…` ~~~~text 31: PHASE FCC_A1 %A 2 1 1 ! 32: CONST FCC_A1 : MG PB% : VA : ! ~~~~ [MgPb-21Deb.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-21Deb.tdb): FCC_A1, type code %A, sha256 `c150e3ea46f0693a…` ~~~~text 37: PHASE FCC_A1 %A 2 1 1 ! 38: CONST FCC_A1 : MG PB% : VA : ! ~~~~ Example references (2 of 2; assessments first): - [doi:10.2298/JMMB130824017Z](https://doi.org/10.2298/JMMB130824017Z) F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/j.jallcom.2020.158396](https://doi.org/10.1016/j.jallcom.2020.158396) A. Dębski, W. Gierlotka, S. Terlicka, W. Gąsior, On the Mg-Pb system. Calorimetric studies and thermodynamic calculations, Journal of Alloys and Compounds 861, 158396 (2021). _assessment that models this phase_ ## HCP_A3 (Mg–Pb) - Id: `phase:mg-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: stable in 3 of 3 calculated diagram(s): 300–927 K, x(Pb) 0–0.0871 - Literature: 18 values (18 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-pb:hcp-a3) Names (7): _corpus: _corpus:phase:mg-pb:hcp-a3 _paper: _paper:10.1016/j.jallcom.2020.158396:HCP_A3 (Mg), paper:10.1016/j.jallcom.2020.158396:HCP_A3(Mg), paper:10.2298/jmmb130824017z:(Mg) _tdb: _tdb:MgPb-14Zha-ass.tdb:HCP_A3, tdb:MgPb-14Zha-sub.tdb:HCP_A3, tdb:MgPb-21Deb.tdb:HCP_A3 ### TDB models of HCP_A3 (3): PHASE and CONSTITUENT statements as written [MgPb-14Zha-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-ass.tdb): HCP_A3, type code %A, sha256 `85fd9842fb3b047b…` ~~~~text 45: PHASE HCP_A3 %A 2 1 0.5 ! 46: CONST HCP_A3 : MG% PB : VA : ! ~~~~ [MgPb-14Zha-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-sub.tdb): HCP_A3, type code %A, sha256 `715ddff6aaa4430b…` ~~~~text 41: PHASE HCP_A3 %A 2 1 0.5 ! 42: CONST HCP_A3 : MG% PB : VA : ! ~~~~ [MgPb-21Deb.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-21Deb.tdb): HCP_A3, type code %A, sha256 `c150e3ea46f0693a…` ~~~~text 47: PHASE HCP_A3 %A 2 1 0.5 ! 48: CONST HCP_A3 : MG% PB : VA : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/j.jallcom.2020.158396](https://doi.org/10.1016/j.jallcom.2020.158396) A. Dębski, W. Gierlotka, S. Terlicka, W. Gąsior, On the Mg-Pb system. Calorimetric studies and thermodynamic calculations, Journal of Alloys and Compounds 861, 158396 (2021). _assessment that models this phase; reports values for this phase_ - [doi:10.2298/JMMB130824017Z](https://doi.org/10.2298/JMMB130824017Z) F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014). _assessment that models this phase; reports values for this phase_ - [doi:10.1002/zaac.19050440107](https://doi.org/10.1002/zaac.19050440107) G. Grube, Metallographische Mitteilungen aus dem Institut für anorganische Chemie der Universität Göttingen. V. Über Magnesium‐Bleilegierungen, Z. Anorg. Chem. 44, 117-130 (1905). _cited as the source of values for this phase_ - [doi:10.1007/bf02871188](https://doi.org/10.1007/bf02871188) A.A. Nayeb-Hashemi, J.B. Clark, The Mg-Pb (magnesium-lead) system, Bull. Alloy Phase Diag. 6 (1985) 56–66. _cited as the source of values for this phase_ ## LIQUID (Mg–Pb) - Id: `phase:mg-pb:liquid`; status `assigned` - Structure: liquid; type `st:liquid`; liquid; confidence high - Stability: stable in 3 of 3 calculated diagram(s): 517.29–2500 K, x(Pb) 0–1 - Literature: 73 values (73 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-pb:liquid) Names (7): _corpus: _corpus:phase:mg-pb:liquid _paper: _paper:10.1016/j.jallcom.2020.158396:L, paper:10.1016/j.jallcom.2020.158396:liquid, paper:10.2298/jmmb130824017z:Liquid _tdb: _tdb:MgPb-14Zha-ass.tdb:LIQUID, tdb:MgPb-14Zha-sub.tdb:LIQUID, tdb:MgPb-21Deb.tdb:LIQUID ### TDB models of LIQUID (3): PHASE and CONSTITUENT statements as written [MgPb-14Zha-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-ass.tdb): LIQUID, type code %, sha256 `85fd9842fb3b047b…` ~~~~text 30: PHASE LIQUID:L % 1 1 ! 31: CONST LIQUID:L : MG MG2PB PB : ! ~~~~ [MgPb-14Zha-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-sub.tdb): LIQUID, type code %, sha256 `715ddff6aaa4430b…` ~~~~text 26: PHASE LIQUID:L % 1 1 ! 27: CONST LIQUID:L : MG PB : ! ~~~~ [MgPb-21Deb.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-21Deb.tdb): LIQUID, type code %, sha256 `c150e3ea46f0693a…` ~~~~text 32: PHASE LIQUID:L % 1 1 ! 33: CONST LIQUID:L : MG MG2PB PB : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.1016/j.jallcom.2020.158396](https://doi.org/10.1016/j.jallcom.2020.158396) A. Dębski, W. Gierlotka, S. Terlicka, W. Gąsior, On the Mg-Pb system. Calorimetric studies and thermodynamic calculations, Journal of Alloys and Compounds 861, 158396 (2021). _assessment that models this phase; reports values for this phase_ - [doi:10.2298/JMMB130824017Z](https://doi.org/10.2298/JMMB130824017Z) F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014). _assessment that models this phase; reports values for this phase_ - [doi:10.1002/zaac.19050440107](https://doi.org/10.1002/zaac.19050440107) G. Grube, Metallographische Mitteilungen aus dem Institut für anorganische Chemie der Universität Göttingen. V. Über Magnesium‐Bleilegierungen, Z. Anorg. Chem. 44, 117-130 (1905). _cited as the source of values for this phase_ - [doi:10.1007/bf02871188](https://doi.org/10.1007/bf02871188) A.A. Nayeb-Hashemi, J.B. Clark, The Mg-Pb (magnesium-lead) system, Bull. Alloy Phase Diag. 6 (1985) 56–66. _cited as the source of values for this phase_ ## MG2PB_C1 (Mg–Pb) - Id: `phase:mg-pb:mg2pb-c1`; status `assigned` - Structure: CaF2 · C1 · cF12 · Fm-3m (225); type `st:c1-caf2-cf12`; tier A: standard phase name; confidence high - Caveat: DFT agrees: on-hull mp-aaaaberc and oqmd-17637, space group 225 - Stoichiometry: Mg 0.6667, Pb 0.3333 - Stability: stable in 3 of 3 calculated diagram(s): 300–823.81 K, x(Pb) 0.33333–0.33333 - Literature: 39 values (39 accepted) from 2 papers - Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:mg-pb:mg2pb-c1) Names (8): _corpus: _corpus:phase:mg-pb:mg2pb-c1 _mp: _mp:mp-aaaaberc _oqmd: _oqmd:oqmd-17637 _paper: _paper:10.1016/j.jallcom.2020.158396:Mg2Pb, paper:10.2298/jmmb130824017z:Mg2Pb _tdb: _tdb:MgPb-14Zha-ass.tdb:MG2PB_C1, tdb:MgPb-14Zha-sub.tdb:MG2PB_C1, tdb:MgPb-21Deb.tdb:MG2PB_C1 ### TDB models of MG2PB_C1 (3): PHASE and CONSTITUENT statements as written [MgPb-14Zha-ass.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-ass.tdb): MG2PB_C1, type code %, sha256 `85fd9842fb3b047b…` ~~~~text 50: PHASE MG2PB_C1 % 2 2 1 ! 51: CONST MG2PB_C1 : MG : PB : ! ~~~~ [MgPb-14Zha-sub.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-14Zha-sub.tdb): MG2PB_C1, type code %, sha256 `715ddff6aaa4430b…` ~~~~text 46: PHASE MG2PB_C1 % 2 2 1 ! 47: CONST MG2PB_C1 : MG : PB : ! ~~~~ [MgPb-21Deb.tdb](https://orchid-project.org/data/databases/sgte-binary/MgPb-21Deb.tdb): MG2PB_C1, type code %, sha256 `c150e3ea46f0693a…` ~~~~text 52: PHASE MG2PB_C1 % 2 2 1 ! 53: CONST MG2PB_C1 : MG : PB : ! ~~~~ Example references (4 of 4; assessments first): - [doi:10.2298/JMMB130824017Z](https://doi.org/10.2298/JMMB130824017Z) F. Zhang, Y. Tang, B. Hu, S. Liu, Y. Du, Y. Zhang, J. Mining Metall. B, 50, 115-26(2014). _assessment that models this phase; reports values for this phase_ - [doi:10.1016/j.jallcom.2020.158396](https://doi.org/10.1016/j.jallcom.2020.158396) A. Dębski, W. Gierlotka, S. Terlicka, W. Gąsior, On the Mg-Pb system. Calorimetric studies and thermodynamic calculations, Journal of Alloys and Compounds 861, 158396 (2021). _assessment that models this phase; reports values for this phase_ - [doi:10.1002/zaac.19050440107](https://doi.org/10.1002/zaac.19050440107) G. Grube, Metallographische Mitteilungen aus dem Institut für anorganische Chemie der Universität Göttingen. V. Über Magnesium‐Bleilegierungen, Z. Anorg. Chem. 44, 117-130 (1905). _cited as the source of values for this phase_ - [doi:10.1007/bf02871188](https://doi.org/10.1007/bf02871188) A.A. Nayeb-Hashemi, J.B. Clark, The Mg-Pb (magnesium-lead) system, Bull. Alloy Phase Diag. 6 (1985) 56–66. _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). 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).