# Gd–Mg phases

> Gd–Mg system: 12 phases (tier A 9, tier C 1, liquid 1, needs_review 1); 11 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/GD-MG.html · Markdown: https://data.orchid-project.org/phases/pages/GD-MG.md

12 phases (tier A 9, tier C 1, liquid 1, needs_review 1); 11 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=GD-MG) · [full JSON](https://data.orchid-project.org/phases/systems/GD-MG.json) · [Gd–Mg system page](https://data.orchid-project.org/systems/GD-MG.html) · [Markdown](https://data.orchid-project.org/phases/pages/GD-MG.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Gd–Mg system (12)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-gd-mg-bcc-a2); _phase:gd-mg:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 957.18–1738.74 K, x(Mg) 0–0.40378 | 12 | 9 |
| [B2_BCC](#phase-gd-mg-bcc-b2); _phase:gd-mg:bcc-b2_ | CsCl · B2 · cP2 · Pm-3m (221) | tier A: standard phase name | stable in 4 of 4 calculated diagram(s): 300–1601.17 K, x(Mg) 0–0.63792 | 6 | 4 |
| [C15_LAVES](#phase-gd-mg-c15-laves); _phase:gd-mg:c15-laves_ | Cu2Mg · C15 · cF24 · Fd-3m (227) | tier A: standard phase name | stable in 3 of 3 calculated diagram(s): 300–1029.49 K, x(Mg) 0.64496–0.68325 | 0 | 3 |
| [D019](#phase-gd-mg-d019); _phase:gd-mg:d019_ | Ni3Sn · D0_19 · hP8 · P6_3/mmc (194) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1768 K, x(Mg) 0–1 | 0 | 2 |
| [FCC_A1](#phase-gd-mg-fcc-a1); _phase:gd-mg:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | not stable in 5 calculated diagram(s) | 0 | 5 |
| [GDMG_B2](#phase-gd-mg-gdmg-b2); _phase:gd-mg:gdmg-b2_ | CsCl · B2 · cP2 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1141.67 K, x(Mg) 0.5–0.5 | 14 | 1 |
| [GDMG2_C15](#phase-gd-mg-gdmg2-c15); _phase:gd-mg:gdmg2-c15_ | Cu2Mg · C15 · cF24 · Fd-3m (227) | tier A: standard phase name | stable in 2 of 2 calculated diagram(s): 300–1033.16 K, x(Mg) 0.66667–0.66667 | 15 | 2 |
| [GDMG3_D03](#phase-gd-mg-gdmg3-d03); _phase:gd-mg:gdmg3-d03_ | BiF3 · D0_3 · cF16 · Fm-3m (225) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 300–993.02 K, x(Mg) 0.73721–0.76378 | 15 | 5 |
| [GDMG5](#phase-gd-mg-gdmg5); _phase:gd-mg:gdmg5_ | Cd45Sm11 · cF448 · F-43m (216) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 5 of 5 calculated diagram(s): 300–929.39 K, x(Mg) 0.83333–0.83921 | 20 | 5 |
| [GDMG7](#phase-gd-mg-gdmg7); _phase:gd-mg:gdmg7_ |  | needs_review | stable in 2 of 2 calculated diagram(s): 300.54–1768 K, x(Mg) 0–1 | 0 | 2 |
| [HCP_A3](#phase-gd-mg-hcp-a3); _phase:gd-mg:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 5 of 5 calculated diagram(s): 300–2499.89 K, x(Mg) 0–1 | 15 | 7 |
| [LIQUID](#phase-gd-mg-liquid); _phase:gd-mg:liquid_ | liquid | liquid | stable in 5 of 5 calculated diagram(s): 820.94–2500 K, x(Mg) 0–1 | 38 | 5 |

## BCC_A2 (Gd–Mg)

- Id: `phase:gd-mg: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 5 of 5 calculated diagram(s): 957.18–1738.74 K, x(Mg) 0–0.40378
- Literature: 12 values (12 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:bcc-a2)

Names (12): _corpus: _corpus:phase:gd-mg:bcc-a2  
_paper: _paper:10.1016/j.calphad.2006.10.004:bcc(Gd), paper:10.1016/j.jallcom.2013.07.042:(βGd)  
_tdb: _tdb:GdMg-03Cac-LB.tdb:A2_BCC, tdb:GdMg-03Cac-LB.tdb:BCC_A2, tdb:GdMg-07Guo.tdb:A2_BCC, tdb:GdMg-07Guo.tdb:BCC_A2, tdb:GdMg-13Ham.tdb:BCC_A2, tdb:GdMg-20Wu.tdb:A2_BCC, tdb:GdMg-20Wu.tdb:BCC_A2, tdb:GdMg-23Lon.tdb:A2_BCC, tdb:GdMg-23Lon.tdb:BCC_A2  


### TDB models of BCC_A2 (9): PHASE and CONSTITUENT statements as written

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): A2_BCC, type code %B, sha256 `2a611e16bdb52c46…`

~~~~text
36: PHASE A2_BCC %B 2 1 3 !
37: CONST A2_BCC : GD MG : VA : !
~~~~

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): BCC_A2, type code %B, sha256 `2a611e16bdb52c46…`

~~~~text
31: PHASE BCC_A2 %B 2 1 3 !
32: CONST BCC_A2 : GD MG : VA : !
~~~~

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): A2_BCC, type code %B, sha256 `8626c76defe4bb26…`

~~~~text
35: PHASE A2_BCC %B 2 1 3 !
36: CONST A2_BCC : GD MG : VA : !
~~~~

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): BCC_A2, type code %B, sha256 `8626c76defe4bb26…`

~~~~text
30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : GD MG : VA : !
~~~~

[GdMg-13Ham.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-13Ham.tdb): BCC_A2, type code %B, sha256 `2b5720165997ee54…`

~~~~text
37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : GD MG : VA : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): A2_BCC, type code %B, sha256 `e4dd7ad023b834f2…`

~~~~text
40: PHASE A2_BCC %B 2 1 3 !
41: CONST A2_BCC : GD MG : VA : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): BCC_A2, type code %B, sha256 `e4dd7ad023b834f2…`

~~~~text
35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : GD MG : VA : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): A2_BCC, type code %B, sha256 `ee25985fe0b62f39…`

~~~~text
44: PHASE A2_BCC %B 2 1 3 !
45: CONST A2_BCC : GD MG : VA : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): BCC_A2, type code %B, sha256 `ee25985fe0b62f39…`

~~~~text
39: PHASE BCC_A2 %B 2 1 3 !
40: CONST BCC_A2 : GD MG : VA : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042) M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_assessment that models this phase; cited as the source of values for this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_
- [doi:10.1016/S0966-9795(03)00151-1](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).  
_assessment that models this phase_
- [doi:10.1016/0022-5088(86)90135-9](https://doi.org/10.1016/0022-5088%2886%2990135-9) P. Manfrinetti, K.A. Gschneidner, Phase equilibrium in the LaMg (0 – 65 at.% Mg) and GdMg systems, Journal of the Less Common Metals 123, 267-275 (1986).  
_cited as the source of values for this phase_

## B2_BCC (Gd–Mg)

- Id: `phase:gd-mg:bcc-b2`; status `assigned`
- Structure: CsCl · B2 · cP2 · Pm-3m (221); type `st:b2-cscl-cp2`; tier A: standard phase name; confidence high
- Caveat: GdMg-03Cac-LB.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
- Caveat: GdMg-07Guo.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
- Caveat: GdMg-20Wu.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
- Caveat: GdMg-23Lon.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
- Caveat: partitioned order/disorder model in GdMg-03Cac-LB.tdb also describes the disordered state
- Caveat: partitioned order/disorder model in GdMg-07Guo.tdb also describes the disordered state
- Caveat: partitioned order/disorder model in GdMg-20Wu.tdb also describes the disordered state
- Caveat: partitioned order/disorder model in GdMg-23Lon.tdb also describes the disordered state
- Stability: stable in 4 of 4 calculated diagram(s): 300–1601.17 K, x(Mg) 0–0.63792
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:bcc-b2)

Names (7): _corpus: _corpus:phase:gd-mg:bcc-b2, corpus:phase:gd-mg:b2-bcc  
_paper: _paper:10.1016/j.calphad.2006.10.004:MgGd  
_tdb: _tdb:GdMg-03Cac-LB.tdb:B2_BCC, tdb:GdMg-07Guo.tdb:B2_BCC, tdb:GdMg-20Wu.tdb:B2_BCC, tdb:GdMg-23Lon.tdb:B2_BCC  


### TDB models of B2_BCC (4): PHASE and CONSTITUENT statements as written

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): B2_BCC, type code %O, sha256 `2a611e16bdb52c46…`

~~~~text
41: PHASE B2_BCC %O 3 0.5 0.5 3 !
42: CONST B2_BCC : GD% MG : GD MG% : VA : !
~~~~

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): B2_BCC, type code %O, sha256 `8626c76defe4bb26…`

~~~~text
40: PHASE B2_BCC %O 3 0.5 0.5 3 !
41: CONST B2_BCC : GD% MG : GD MG% : VA : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): B2_BCC, type code %O, sha256 `e4dd7ad023b834f2…`

~~~~text
45: PHASE B2_BCC %O 3 0.5 0.5 3 !
46: CONST B2_BCC : GD% MG : GD MG% : VA : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): B2_BCC, type code %O, sha256 `ee25985fe0b62f39…`

~~~~text
49: PHASE B2_BCC %O 3 0.5 0.5 3 !
50: CONST B2_BCC : GD% MG : GD MG% : VA : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_
- [doi:10.1016/S0966-9795(03)00151-1](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).  
_assessment that models this phase_
- [doi:10.1016/0022-5088(86)90135-9](https://doi.org/10.1016/0022-5088%2886%2990135-9) P. Manfrinetti, K.A. Gschneidner, Phase equilibrium in the LaMg (0 – 65 at.% Mg) and GdMg systems, Journal of the Less Common Metals 123, 267-275 (1986).  
_cited as the source of values for this phase_

## C15_LAVES (Gd–Mg)

- Id: `phase:gd-mg:c15-laves`; status `assigned`
- Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type `st:c15-cu2mg-cf24`; tier A: standard phase name; confidence high
- Caveat: partitioned order/disorder model in GdMg-03Cac-LB.tdb also describes the disordered state
- Caveat: partitioned order/disorder model in GdMg-20Wu.tdb also describes the disordered state
- Caveat: partitioned order/disorder model in GdMg-23Lon.tdb also describes the disordered state
- Stability: stable in 3 of 3 calculated diagram(s): 300–1029.49 K, x(Mg) 0.64496–0.68325
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:c15-laves)

Names (4): _corpus: _corpus:phase:gd-mg:c15-laves  
_tdb: _tdb:GdMg-03Cac-LB.tdb:C15_LAVES, tdb:GdMg-20Wu.tdb:C15_LAVES, tdb:GdMg-23Lon.tdb:C15_LAVES  


### TDB models of C15_LAVES (3): PHASE and CONSTITUENT statements as written

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): C15_LAVES, type code %, sha256 `2a611e16bdb52c46…`

~~~~text
51: PHASE C15_LAVES % 2 2 1 !
52: CONST C15_LAVES : GD MG% : GD% MG : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): C15_LAVES, type code %, sha256 `e4dd7ad023b834f2…`

~~~~text
66: PHASE C15_LAVES % 2 2 1 !
67: CONST C15_LAVES : GD MG% : GD% MG : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): C15_LAVES, type code %, sha256 `ee25985fe0b62f39…`

~~~~text
70: PHASE C15_LAVES % 2 2 1 !
71: CONST C15_LAVES : GD MG% : GD% MG : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_
- [doi:10.1016/S0966-9795(03)00151-1](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).  
_assessment that models this phase_

## D019 (Gd–Mg)

- Id: `phase:gd-mg:d019`; status `assigned`
- Structure: Ni3Sn · D0_19 · hP8 · P6_3/mmc (194); type `st:d0-19-ni3sn-hp8`; tier A: standard phase name; confidence high
- Caveat: GdMg-20Wu.tdb: ordered phase with disordered part A3_HCP (order/disorder model)
- Caveat: GdMg-23Lon.tdb: ordered phase with disordered part A3_HCP (order/disorder model)
- Caveat: partitioned order/disorder model in GdMg-20Wu.tdb also describes the disordered state
- Caveat: partitioned order/disorder model in GdMg-23Lon.tdb also describes the disordered state
- Stability: stable in 2 of 2 calculated diagram(s): 300–1768 K, x(Mg) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:d019)

Names (3): _corpus: _corpus:phase:gd-mg:d019  
_tdb: _tdb:GdMg-20Wu.tdb:D019, tdb:GdMg-23Lon.tdb:D019  


### TDB models of D019 (2): PHASE and CONSTITUENT statements as written

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): D019, type code %AP, sha256 `e4dd7ad023b834f2…`

~~~~text
58: PHASE D019 %AP 3 0.75 0.25 0.5 !
59: CONST D019 : GD MG% : GD% MG : VA : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): D019, type code %AP, sha256 `ee25985fe0b62f39…`

~~~~text
62: PHASE D019 %AP 3 0.75 0.25 0.5 !
63: CONST D019 : GD MG% : GD% MG : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_

## FCC_A1 (Gd–Mg)

- Id: `phase:gd-mg:fcc-a1`; status `assigned`
- Structure: Cu · A1 · cF4 · Fm-3m (225); type `st:a1-cu-cf4`; tier A: standard phase name; confidence high
- Stability: not stable in 5 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:fcc-a1)

Names (6): _corpus: _corpus:phase:gd-mg:fcc-a1  
_tdb: _tdb:GdMg-03Cac-LB.tdb:FCC_A1, tdb:GdMg-07Guo.tdb:FCC_A1, tdb:GdMg-13Ham.tdb:FCC_A1, tdb:GdMg-20Wu.tdb:FCC_A1, tdb:GdMg-23Lon.tdb:FCC_A1  


### TDB models of FCC_A1 (5): PHASE and CONSTITUENT statements as written

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): FCC_A1, type code %A, sha256 `2a611e16bdb52c46…`

~~~~text
26: PHASE FCC_A1 %A 2 1 1 !
27: CONST FCC_A1 : GD MG : VA : !
~~~~

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): FCC_A1, type code %A, sha256 `8626c76defe4bb26…`

~~~~text
25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : GD MG : VA : !
~~~~

[GdMg-13Ham.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-13Ham.tdb): FCC_A1, type code %A, sha256 `2b5720165997ee54…`

~~~~text
32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : GD MG : VA : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): FCC_A1, type code %A, sha256 `e4dd7ad023b834f2…`

~~~~text
30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : GD MG : VA : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): FCC_A1, type code %A, sha256 `ee25985fe0b62f39…`

~~~~text
34: PHASE FCC_A1 %A 2 1 1 !
35: CONST FCC_A1 : GD MG : VA : !
~~~~

Example references (5 of 5; assessments first): 

- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_
- [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042) M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013).  
_assessment that models this phase_
- [doi:10.1016/S0966-9795(03)00151-1](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).  
_assessment that models this phase_

## GDMG_B2 (Gd–Mg)

- Id: `phase:gd-mg:gdmg-b2`; status `assigned`
- Structure: CsCl · B2 · cP2 · Pm-3m (221); type `st:b2-cscl-cp2`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaaadxk and oqmd-20466, space group 221
- Stoichiometry: Gd 0.5000, Mg 0.5000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1141.67 K, x(Mg) 0.5–0.5
- Literature: 14 values (14 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:gdmg-b2)

Names (5): _corpus: _corpus:phase:gd-mg:gdmg-b2  
_mp: _mp:mp-aaaaadxk  
_oqmd: _oqmd:oqmd-20466  
_paper: _paper:10.1016/j.jallcom.2013.07.042:GdMg  
_tdb: _tdb:GdMg-13Ham.tdb:GDMG_B2  


### TDB models of GDMG_B2 (1): PHASE and CONSTITUENT statements as written

[GdMg-13Ham.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-13Ham.tdb): GDMG_B2, type code %, sha256 `2b5720165997ee54…`

~~~~text
47: PHASE GDMG_B2 % 2 1 1 !
48: CONST GDMG_B2 : GD : MG : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042) M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(86)90135-9](https://doi.org/10.1016/0022-5088%2886%2990135-9) P. Manfrinetti, K.A. Gschneidner, Phase equilibrium in the LaMg (0 – 65 at.% Mg) and GdMg systems, Journal of the Less Common Metals 123, 267-275 (1986).  
_cited as the source of values for this phase_
- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_cited as the source of values for this phase_
- [doi:10.1063/1.2202923](https://doi.org/10.1063/1.2202923) Y. Janssen, M. Angst, K. W. Dennis, P. C. Canfield, R. W. McCallum, Small sealed Ta crucible for thermal analysis of volatile metallic samples, Review of Scientific Instruments 77 (2006).  
_cited as the source of values for this phase_

## GDMG2_C15 (Gd–Mg)

- Id: `phase:gd-mg:gdmg2-c15`; status `assigned`
- Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type `st:c15-cu2mg-cf24`; tier A: standard phase name; confidence high
- Stoichiometry: Gd 0.3333, Mg 0.6667
- Stability: stable in 2 of 2 calculated diagram(s): 300–1033.16 K, x(Mg) 0.66667–0.66667
- Literature: 15 values (15 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:gdmg2-c15)

Names (5): _corpus: _corpus:phase:gd-mg:gdmg2-c15  
_paper: _paper:10.1016/j.calphad.2006.10.004:Mg2Gd, paper:10.1016/j.jallcom.2013.07.042:GdMg2  
_tdb: _tdb:GdMg-07Guo.tdb:GDMG2_C15, tdb:GdMg-13Ham.tdb:GDMG2_C15  


### TDB models of GDMG2_C15 (2): PHASE and CONSTITUENT statements as written

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): GDMG2_C15, type code %, sha256 `8626c76defe4bb26…`

~~~~text
50: PHASE GDMG2_C15 % 2 1 2 !
51: CONST GDMG2_C15 : GD : MG : !
~~~~

[GdMg-13Ham.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-13Ham.tdb): GDMG2_C15, type code %, sha256 `2b5720165997ee54…`

~~~~text
52: PHASE GDMG2_C15 % 2 1 2 !
53: CONST GDMG2_C15 : GD : MG : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042) M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_assessment that models this phase; cited as the source of values for this phase; reports values for this phase_
- [doi:10.1016/0022-5088(86)90135-9](https://doi.org/10.1016/0022-5088%2886%2990135-9) P. Manfrinetti, K.A. Gschneidner, Phase equilibrium in the LaMg (0 – 65 at.% Mg) and GdMg systems, Journal of the Less Common Metals 123, 267-275 (1986).  
_cited as the source of values for this phase_
- [doi:10.1063/1.2202923](https://doi.org/10.1063/1.2202923) Y. Janssen, M. Angst, K. W. Dennis, P. C. Canfield, R. W. McCallum, Small sealed Ta crucible for thermal analysis of volatile metallic samples, Review of Scientific Instruments 77 (2006).  
_cited as the source of values for this phase_

## GDMG3_D03 (Gd–Mg)

- Id: `phase:gd-mg:gdmg3-d03`; status `assigned`
- Structure: BiF3 · D0_3 · cF16 · Fm-3m (225); type `st:d0-3-bif3-cf16`; tier A: standard phase name; confidence high
- Caveat: partitioned order/disorder model in GdMg-20Wu.tdb also describes the disordered state
- Caveat: partitioned order/disorder model in GdMg-23Lon.tdb also describes the disordered state
- Stability: stable in 5 of 5 calculated diagram(s): 300–993.02 K, x(Mg) 0.73721–0.76378
- Literature: 15 values (15 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:gdmg3-d03)

Names (8): _corpus: _corpus:phase:gd-mg:gdmg3-d03  
_paper: _paper:10.1016/j.calphad.2006.10.004:Mg3Gd, paper:10.1016/j.jallcom.2013.07.042:GdMg3  
_tdb: _tdb:GdMg-03Cac-LB.tdb:GDMG3_D03, tdb:GdMg-07Guo.tdb:GDMG3_D03, tdb:GdMg-13Ham.tdb:GDMG3_D03, tdb:GdMg-20Wu.tdb:GDMG3_D03, tdb:GdMg-23Lon.tdb:GDMG3_D03  


### TDB models of GDMG3_D03 (5): PHASE and CONSTITUENT statements as written

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): GDMG3_D03, type code %, sha256 `2a611e16bdb52c46…`

~~~~text
56: PHASE GDMG3_D03 % 2 1 3 !
57: CONST GDMG3_D03 : GD : MG : !
~~~~

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): GDMG3_D03, type code %, sha256 `8626c76defe4bb26…`

~~~~text
55: PHASE GDMG3_D03 % 2 1 3 !
56: CONST GDMG3_D03 : GD : MG : !
~~~~

[GdMg-13Ham.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-13Ham.tdb): GDMG3_D03, type code %, sha256 `2b5720165997ee54…`

~~~~text
57: PHASE GDMG3_D03 % 2 1 3 !
58: CONST GDMG3_D03 : GD : MG : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): GDMG3_D03, type code %, sha256 `e4dd7ad023b834f2…`

~~~~text
71: PHASE GDMG3_D03 % 2 1 3 !
72: CONST GDMG3_D03 : GD% MG : GD MG% : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): GDMG3_D03, type code %, sha256 `ee25985fe0b62f39…`

~~~~text
75: PHASE GDMG3_D03 % 2 1 3 !
76: CONST GDMG3_D03 : GD% MG : GD MG% : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042) M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_assessment that models this phase; cited as the source of values for this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_
- [doi:10.1016/S0966-9795(03)00151-1](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).  
_assessment that models this phase_
- [doi:10.1016/0022-5088(86)90135-9](https://doi.org/10.1016/0022-5088%2886%2990135-9) P. Manfrinetti, K.A. Gschneidner, Phase equilibrium in the LaMg (0 – 65 at.% Mg) and GdMg systems, Journal of the Less Common Metals 123, 267-275 (1986).  
_cited as the source of values for this phase_

## GDMG5 (Gd–Mg)

- Id: `phase:gd-mg:gdmg5`; status `assigned`
- Structure: Cd45Sm11 · cF448 · F-43m (216); type `st:cd45sm11-cf448`; 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_structure_token, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
- Stability: stable in 5 of 5 calculated diagram(s): 300–929.39 K, x(Mg) 0.83333–0.83921
- Literature: 20 values (20 accepted) from 4 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:gdmg5)

Names (10): _corpus: _corpus:phase:gd-mg:gdmg5  
_paper: _paper:10.1016/j.actamat.2015.02.044:GdMg5, paper:10.1016/j.calphad.2006.10.004:Mg5Gd, paper:10.1016/j.jallcom.2013.07.042:GdMg5, paper:10.1361/105497101770339274:GdMg5  
_tdb: _tdb:GdMg-03Cac-LB.tdb:GDMG5, tdb:GdMg-07Guo.tdb:GDMG5, tdb:GdMg-13Ham.tdb:GDMG5, tdb:GdMg-20Wu.tdb:GDMG5, tdb:GdMg-23Lon.tdb:GDMG5  


### TDB models of GDMG5 (5): PHASE and CONSTITUENT statements as written

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): GDMG5, type code %, sha256 `2a611e16bdb52c46…`

~~~~text
61: PHASE GDMG5 % 2 1 5 !
62: CONST GDMG5 : GD : MG : !
~~~~

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): GDMG5, type code %, sha256 `8626c76defe4bb26…`

~~~~text
60: PHASE GDMG5 % 2 1 5 !
61: CONST GDMG5 : GD : MG : !
~~~~

[GdMg-13Ham.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-13Ham.tdb): GDMG5, type code %, sha256 `2b5720165997ee54…`

~~~~text
62: PHASE GDMG5 % 2 1 5 !
63: CONST GDMG5 : GD : MG : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): GDMG5, type code %, sha256 `e4dd7ad023b834f2…`

~~~~text
76: PHASE GDMG5 % 2 1 5 !
77: CONST GDMG5 : GD% MG : MG : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): GDMG5, type code %, sha256 `ee25985fe0b62f39…`

~~~~text
80: PHASE GDMG5 % 2 1 5 !
81: CONST GDMG5 : GD% MG : MG : !
~~~~

Example references (10 of 10; assessments first): 

- [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042) M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_assessment that models this phase; cited as the source of values for this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_
- [doi:10.1016/S0966-9795(03)00151-1](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).  
_assessment that models this phase_
- [doi:10.1016/0022-5088(86)90135-9](https://doi.org/10.1016/0022-5088%2886%2990135-9) P. Manfrinetti, K.A. Gschneidner, Phase equilibrium in the LaMg (0 – 65 at.% Mg) and GdMg systems, Journal of the Less Common Metals 123, 267-275 (1986).  
_cited as the source of values for this phase_
- [doi:10.1016/j.actamat.2015.02.044](https://doi.org/10.1016/j.actamat.2015.02.044) Joachim Gröbner, Artem Kozlov, Xi-Ya Fang, Suming Zhu, Jian-Feng Nie, Mark A. Gibson et al., Phase equilibria and transformations in ternary Mg–Gd–Zn alloys, Acta Materialia 90, 400-416 (2015).  
_reports values for this phase_
- [doi:10.1016/j.calphad.2008.08.004](https://doi.org/10.1016/j.calphad.2008.08.004) W. Cao, S. Chen, F. Zhang, K. Wu, Y. Yang, Y. Chang, R. Schmid-Fetzer, W.A. Oates, Calphad 33 (2009) 328.  
_cited as the source of values for this phase_
- [doi:10.1107/s0108270186097019](https://doi.org/10.1107/s0108270186097019) M. L. Fornasini, P. Manfrinetti, K. A. Gschneidner Jnr, GdMg5: a complex structure with a large cubic cell, Acta Crystallogr C Cryst Struct Commun 42, 138-141 (1986).  
_cited as the source of values for this phase_
- [doi:10.1361/105497101770339274](https://doi.org/10.1361/105497101770339274) D. G. Kevorkov, J. Gröbner, R. Schmid-Fetzer, V. V. Pavlyuk, G. S. Dmytriv, O. I. Bodak, The ternary Gd-Li-Mg system: Phase diagram study and computational evaluation, JPE 22, 34-42 (2001).  
_reports values for this phase_

## GDMG7 (Gd–Mg)

- Id: `phase:gd-mg:gdmg7`; status `needs_review`
- No structure assigned. Why: no_structure_token; off_stoichiometric_model
- Candidate (dft_mp): Pm-3m (221) — on-hull MP GdMg at x(MG)=0.5000
- Candidate (dft_mp): Fm-3m (225) — on-hull MP GdMg3 at x(MG)=0.7500
- Candidate (dft_oqmd): Pm-3m (221) — on-hull OQMD Gd1 Mg1 at x(MG)=0.5000
- Candidate (dft_oqmd): Pmmn (59) — on-hull OQMD Gd1 Mg3 at x(MG)=0.7500
- Candidate (dft_oqmd): Cmcm (63) — on-hull OQMD Gd2 Mg1 at x(MG)=0.3333
- Stability: stable in 2 of 2 calculated diagram(s): 300.54–1768 K, x(Mg) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:gdmg7)

Names (3): _corpus: _corpus:phase:gd-mg:gdmg7  
_tdb: _tdb:GdMg-20Wu.tdb:GDMG7, tdb:GdMg-23Lon.tdb:GDMG7  


### TDB models of GDMG7 (2): PHASE and CONSTITUENT statements as written

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): GDMG7, type code %AQ, sha256 `e4dd7ad023b834f2…`

~~~~text
61: PHASE GDMG7 %AQ 3 0.875 0.125 0.5 !
62: CONST GDMG7 : GD MG% : GD% MG : VA : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): GDMG7, type code %AQ, sha256 `ee25985fe0b62f39…`

~~~~text
65: PHASE GDMG7 %AQ 3 0.875 0.125 0.5 !
66: CONST GDMG7 : GD MG% : GD% MG : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_

## HCP_A3 (Gd–Mg)

- Id: `phase:gd-mg: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 5 of 5 calculated diagram(s): 300–2499.89 K, x(Mg) 0–1
- Literature: 15 values (15 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:hcp-a3)

Names (12): _corpus: _corpus:phase:gd-mg:hcp-a3  
_paper: _paper:10.1016/j.calphad.2006.10.004:hcp(Gd), paper:10.1016/j.calphad.2006.10.004:hcp(Mg), paper:10.1016/j.jallcom.2013.07.042:(Mg), paper:10.1016/j.jallcom.2013.07.042:(αGd)  
_tdb: _tdb:GdMg-03Cac-LB.tdb:HCP_A3, tdb:GdMg-07Guo.tdb:HCP_A3, tdb:GdMg-13Ham.tdb:HCP_A3, tdb:GdMg-20Wu.tdb:A3_HCP, tdb:GdMg-20Wu.tdb:HCP_A3, tdb:GdMg-23Lon.tdb:A3_HCP, tdb:GdMg-23Lon.tdb:HCP_A3  


### TDB models of HCP_A3 (7): PHASE and CONSTITUENT statements as written

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): HCP_A3, type code %A, sha256 `2a611e16bdb52c46…`

~~~~text
46: PHASE HCP_A3 %A 2 1 0.5 !
47: CONST HCP_A3 : GD MG : VA : !
~~~~

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): HCP_A3, type code %A, sha256 `8626c76defe4bb26…`

~~~~text
45: PHASE HCP_A3 %A 2 1 0.5 !
46: CONST HCP_A3 : GD MG : VA : !
~~~~

[GdMg-13Ham.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-13Ham.tdb): HCP_A3, type code %A, sha256 `2b5720165997ee54…`

~~~~text
42: PHASE HCP_A3 %A 2 1 0.5 !
43: CONST HCP_A3 : GD MG : VA : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): A3_HCP, type code %A, sha256 `e4dd7ad023b834f2…`

~~~~text
55: PHASE A3_HCP %A 2 1 0.5 !
56: CONST A3_HCP : GD MG : VA : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): HCP_A3, type code %A, sha256 `e4dd7ad023b834f2…`

~~~~text
50: PHASE HCP_A3 %A 2 1 0.5 !
51: CONST HCP_A3 : GD MG : VA : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): A3_HCP, type code %A, sha256 `ee25985fe0b62f39…`

~~~~text
59: PHASE A3_HCP %A 2 1 0.5 !
60: CONST A3_HCP : GD MG : VA : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): HCP_A3, type code %A, sha256 `ee25985fe0b62f39…`

~~~~text
54: PHASE HCP_A3 %A 2 1 0.5 !
55: CONST HCP_A3 : GD MG : VA : !
~~~~

Example references (6 of 6; assessments first): 

- [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042) M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_assessment that models this phase; cited as the source of values for this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_
- [doi:10.1016/S0966-9795(03)00151-1](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).  
_assessment that models this phase_
- [doi:10.1016/0022-5088(86)90135-9](https://doi.org/10.1016/0022-5088%2886%2990135-9) P. Manfrinetti, K.A. Gschneidner, Phase equilibrium in the LaMg (0 – 65 at.% Mg) and GdMg systems, Journal of the Less Common Metals 123, 267-275 (1986).  
_cited as the source of values for this phase_

## LIQUID (Gd–Mg)

- Id: `phase:gd-mg:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 5 of 5 calculated diagram(s): 820.94–2500 K, x(Mg) 0–1
- Literature: 38 values (38 accepted) from 2 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-mg:liquid)

Names (8): _corpus: _corpus:phase:gd-mg:liquid  
_paper: _paper:10.1016/j.calphad.2006.10.004:L, paper:10.1016/j.jallcom.2013.07.042:L  
_tdb: _tdb:GdMg-03Cac-LB.tdb:LIQUID, tdb:GdMg-07Guo.tdb:LIQUID, tdb:GdMg-13Ham.tdb:LIQUID, tdb:GdMg-20Wu.tdb:LIQUID, tdb:GdMg-23Lon.tdb:LIQUID  


### TDB models of LIQUID (5): PHASE and CONSTITUENT statements as written

[GdMg-03Cac-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-03Cac-LB.tdb): LIQUID, type code %, sha256 `2a611e16bdb52c46…`

~~~~text
21: PHASE LIQUID:L % 1 1 !
22: CONST LIQUID:L : GD MG : !
~~~~

[GdMg-07Guo.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-07Guo.tdb): LIQUID, type code %, sha256 `8626c76defe4bb26…`

~~~~text
20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : GD MG : !
~~~~

[GdMg-13Ham.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-13Ham.tdb): LIQUID, type code %, sha256 `2b5720165997ee54…`

~~~~text
27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : GD MG : !
~~~~

[GdMg-20Wu.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-20Wu.tdb): LIQUID, type code %, sha256 `e4dd7ad023b834f2…`

~~~~text
25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : GD MG : !
~~~~

[GdMg-23Lon.tdb](https://orchid-project.org/data/databases/sgte-binary/GdMg-23Lon.tdb): LIQUID, type code %, sha256 `ee25985fe0b62f39…`

~~~~text
29: PHASE LIQUID:L % 1 1 !
30: CONST LIQUID:L : GD MG : !
~~~~

Example references (7 of 7; assessments first): 

- [doi:10.1016/j.jallcom.2013.07.042](https://doi.org/10.1016/j.jallcom.2013.07.042) M. Hampl, C. Blawert, M.R. Silva Campos, N. Hort, Q. Peng, K.U. Kainer et al., Thermodynamic assessment and experimental study of Mg–Gd alloys, Journal of Alloys and Compounds 581, 166-177 (2013).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2006.10.004](https://doi.org/10.1016/j.calphad.2006.10.004) Cuiping Guo, Zhenmin Du, Changrong Li, A thermodynamic description of the Gd–Mg–Y system, Calphad 31, 75-88 (2007).  
_assessment that models this phase; cited as the source of values for this phase; reports values for this phase_
- [doi:10.1016/j.calphad.2019.101712](https://doi.org/10.1016/j.calphad.2019.101712) X. Wu, C. Li, J. Zheng, Y. Ruan, C. Guo, Z. Du, B. Chen, Y. Wu, Calphad, 68, 101712(2020).  
_assessment that models this phase_
- [doi:10.1016/j.calphad.2023.102583](https://doi.org/10.1016/j.calphad.2023.102583) Q. Long, N. Meng, F. Chen, L. Zhang, X. Tao, L. Liu, G. Xu, Y. Cui, Calphad, 82, 102583(2023).  
_assessment that models this phase_
- [doi:10.1016/S0966-9795(03)00151-1](https://doi.org/10.1016/S0966-9795%2803%2900151-1) G. Cacciamani, S. De Negri, A. Saccone, R. Ferro, Intermetallics, 11, 1135-51(2003).  
_assessment that models this phase_
- [doi:10.1016/0022-5088(86)90135-9](https://doi.org/10.1016/0022-5088%2886%2990135-9) P. Manfrinetti, K.A. Gschneidner, Phase equilibrium in the LaMg (0 – 65 at.% Mg) and GdMg systems, Journal of the Less Common Metals 123, 267-275 (1986).  
_cited as the source of values for this phase_
- [doi:10.1063/1.2202923](https://doi.org/10.1063/1.2202923) Y. Janssen, M. Angst, K. W. Dennis, P. C. Canfield, R. W. McCallum, Small sealed Ta crucible for thermal analysis of volatile metallic samples, Review of Scientific Instruments 77 (2006).  
_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).