# Gd–Pd phases

> Gd–Pd system: 14 phases (tier A 8, tier C 1, liquid 1, needs_review 4); 14 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-PD.html · Markdown: https://data.orchid-project.org/phases/pages/GD-PD.md

14 phases (tier A 8, tier C 1, liquid 1, needs_review 4); 14 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-PD) · [full JSON](https://data.orchid-project.org/phases/systems/GD-PD.json) · [Gd–Pd system page](https://data.orchid-project.org/systems/GD-PD.html) · [Markdown](https://data.orchid-project.org/phases/pages/GD-PD.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Gd–Pd system (14)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-gd-pd-bcc-a2); _phase:gd-pd:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1508.16–1586.12 K, x(Pd) 0–0.01284 | 2 | 1 |
| [FCC_A1](#phase-gd-pd-fcc-a1); _phase:gd-pd:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1963 K, x(Pd) 0.88461–1 | 5 | 1 |
| [GD2PD3](#phase-gd-pd-gd2pd3); _phase:gd-pd:gd2pd3_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 1402.63–1432.31 K, x(Pd) 0.6–0.6 | 6 | 1 |
| [GD3PD2_D5A](#phase-gd-pd-gd3pd2-d5a); _phase:gd-pd:gd3pd2-d5a_ | Si2U3 · D5_a · tP10 · P4/mbm (127) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1155.27 K, x(Pd) 0.4–0.4 | 4 | 1 |
| [GD3PD4_HT](#phase-gd-pd-gd3pd4-ht); _phase:gd-pd:gd3pd4-ht_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 1577.7–1628.48 K, x(Pd) 0.57143–0.57143 | 10 | 1 |
| [GD3PD4_LT](#phase-gd-pd-gd3pd4-lt); _phase:gd-pd:gd3pd4-lt_ | Pd4Pu3 · hR14 · R-3 (148) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1577.7 K, x(Pd) 0.57143–0.57143 | 6 | 1 |
| [GD7PD3_D102](#phase-gd-pd-gd7pd3-d102); _phase:gd-pd:gd7pd3-d102_ | Fe3Th7 · D10_2 · hP20 · P6_3mc (186) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1084.85 K, x(Pd) 0.3–0.3 | 6 | 1 |
| [GDPD_B2](#phase-gd-pd-gdpd-b2); _phase:gd-pd:gdpd-b2_ | CsCl · B2 · cP2 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1272.74–1653.64 K, x(Pd) 0.49367–0.5 | 10 | 1 |
| [GDPD_B33](#phase-gd-pd-gdpd-b33); _phase:gd-pd:gdpd-b33_ | CrB · B33 · oC8 · Cmcm (63) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1308.64 K, x(Pd) 0.49138–0.5 | 6 | 1 |
| [GDPD2](#phase-gd-pd-gdpd2); _phase:gd-pd:gdpd2_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1498.4 K, x(Pd) 0.66667–0.66667 | 6 | 1 |
| [GDPD3_L12](#phase-gd-pd-gdpd3-l12); _phase:gd-pd:gdpd3-l12_ | AuCu3 · L1_2 · cP4 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1902.24 K, x(Pd) 0.75–0.78474 | 9 | 1 |
| [GDPD7](#phase-gd-pd-gdpd7); _phase:gd-pd:gdpd7_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–810 K, x(Pd) 0.875–0.875 | 3 | 1 |
| [HCP_A3](#phase-gd-pd-hcp-a3); _phase:gd-pd:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1562.77 K, x(Pd) 0–0.03639 | 6 | 1 |
| [LIQUID](#phase-gd-pd-liquid); _phase:gd-pd:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 1057.88–2500 K, x(Pd) 0–1 | 30 | 1 |

## BCC_A2 (Gd–Pd)

- Id: `phase:gd-pd: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): 1508.16–1586.12 K, x(Pd) 0–0.01284
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:bcc-a2)

Names (3): _corpus: _corpus:phase:gd-pd:bcc-a2  
_paper: _paper:10.1016/s0925-8388(00)01144-0:bcc(Gd)  
_tdb: _tdb:GdPd-00Du.tdb:BCC_A2  


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

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): BCC_A2, type code %B, sha256 `a7d4cf1a658c9d93…`

~~~~text
36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : GD% PD : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_

## FCC_A1 (Gd–Pd)

- Id: `phase:gd-pd: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): 300–1963 K, x(Pd) 0.88461–1
- Literature: 5 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:fcc-a1)

Names (3): _corpus: _corpus:phase:gd-pd:fcc-a1  
_paper: _paper:10.1016/s0925-8388(00)01144-0:fcc(Pd)  
_tdb: _tdb:GdPd-00Du.tdb:FCC_A1  


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

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): FCC_A1, type code %A, sha256 `a7d4cf1a658c9d93…`

~~~~text
31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : GD PD% : VA : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(88)90045-8](https://doi.org/10.1016/0022-5088%2888%2990045-8) Y Sakamoto, K Takao, M Yoshida, Ted B Flanagan, Evidence for an ordered Pd7Gd phase in PdGd alloys, Journal of the Less Common Metals 143, 207-218 (1988).  
_cited as the source of values for this phase_

## GD2PD3 (Gd–Pd)

- Id: `phase:gd-pd:gd2pd3`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (literature_printed): (Gd2Pd3) · ? — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Gd2Pd3) — Hallstedt 2025 mmc2 row for GD2PD3: Gd2Pd3
- Stoichiometry: Gd 0.4000, Pd 0.6000
- Stability: stable in 1 of 1 calculated diagram(s): 1402.63–1432.31 K, x(Pd) 0.6–0.6
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gd2pd3)

Names (3): _corpus: _corpus:phase:gd-pd:gd2pd3  
_paper: _paper:10.1016/s0925-8388(00)01144-0:Gd2Pd3  
_tdb: _tdb:GdPd-00Du.tdb:GD2PD3  


### TDB models of GD2PD3 (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GD2PD3, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
76: PHASE GD2PD3 % 2 2 3 !
77: CONST GD2PD3 : GD : PD : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_

## GD3PD2_D5A (Gd–Pd)

- Id: `phase:gd-pd:gd3pd2-d5a`; status `assigned`
- Structure: Si2U3 · D5_a · tP10 · P4/mbm (127); type `st:d5-a-si2u3-tp10`; tier A: standard phase name; confidence high
- Stoichiometry: Gd 0.6000, Pd 0.4000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1155.27 K, x(Pd) 0.4–0.4
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gd3pd2-d5a)

Names (3): _corpus: _corpus:phase:gd-pd:gd3pd2-d5a  
_paper: _paper:10.1016/s0925-8388(00)01144-0:Gd3Pd2  
_tdb: _tdb:GdPd-00Du.tdb:GD3PD2_D5A  


### TDB models of GD3PD2_D5A (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GD3PD2_D5A, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
51: PHASE GD3PD2_D5A % 2 3 2 !
52: CONST GD3PD2_D5A : GD : PD : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_

## GD3PD4_HT (Gd–Pd)

- Id: `phase:gd-pd:gd3pd4-ht`; status `needs_review`
- No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete
- Candidate (dft_oqmd): R-3 (148) — on-hull OQMD Gd3 Pd4 at x(PD)=0.5714
- Candidate (literature_printed): (Gd3Pd4-HT) · ? — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (Gd3Pd4-HT) — Hallstedt 2025 mmc2 row for GD3PD4_HT: Gd3Pd4 (high T)
- Stoichiometry: Gd 0.4286, Pd 0.5714
- Stability: stable in 1 of 1 calculated diagram(s): 1577.7–1628.48 K, x(Pd) 0.57143–0.57143
- Literature: 10 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gd3pd4-ht)

Names (3): _corpus: _corpus:phase:gd-pd:gd3pd4-ht  
_paper: _paper:10.1016/s0925-8388(00)01144-0:βGd3Pd4  
_tdb: _tdb:GdPd-00Du.tdb:GD3PD4_HT  


### TDB models of GD3PD4_HT (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GD3PD4_HT, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
71: PHASE GD3PD4_HT % 2 3 4 !
72: CONST GD3PD4_HT : GD : PD : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(74)90221-5](https://doi.org/10.1016/0022-5088%2874%2990221-5) A. Palenzona, A. Iandelli, The crystal structure and lattice constants of RE3Pd4, Y3Pd4 and Th3Pd4 compounds, Journal of the Less Common Metals 34, 121-124 (1974).  
_cited as the source of values for this phase_

## GD3PD4_LT (Gd–Pd)

- Id: `phase:gd-pd:gd3pd4-lt`; status `assigned`
- Structure: Pd4Pu3 · hR14 · R-3 (148); type `st:pd4pu3-hr14`; 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, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Gd 0.4286, Pd 0.5714
- Stability: stable in 1 of 1 calculated diagram(s): 300–1577.7 K, x(Pd) 0.57143–0.57143
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gd3pd4-lt)

Names (3): _corpus: _corpus:phase:gd-pd:gd3pd4-lt  
_paper: _paper:10.1016/s0925-8388(00)01144-0:αGd3Pd4  
_tdb: _tdb:GdPd-00Du.tdb:GD3PD4_LT  


### TDB models of GD3PD4_LT (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GD3PD4_LT, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
66: PHASE GD3PD4_LT % 2 3 4 !
67: CONST GD3PD4_LT : GD : PD : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_

## GD7PD3_D102 (Gd–Pd)

- Id: `phase:gd-pd:gd7pd3-d102`; status `assigned`
- Structure: Fe3Th7 · D10_2 · hP20 · P6_3mc (186); type `st:d10-2-fe3th7-hp20`; tier A: standard phase name; confidence high
- Stoichiometry: Gd 0.7000, Pd 0.3000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1084.85 K, x(Pd) 0.3–0.3
- Literature: 6 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gd7pd3-d102)

Names (3): _corpus: _corpus:phase:gd-pd:gd7pd3-d102  
_paper: _paper:10.1016/s0925-8388(00)01144-0:Gd7Pd3  
_tdb: _tdb:GdPd-00Du.tdb:GD7PD3_D102  


### TDB models of GD7PD3_D102 (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GD7PD3_D102, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
46: PHASE GD7PD3_D102 % 2 7 3 !
47: CONST GD7PD3_D102 : GD : PD : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(73)90074-x](https://doi.org/10.1016/0022-5088%2873%2990074-x) J.M. Moreau, E. Parthé, Ferromagnetic Gd7Pd3 and other rare-earth-palladium compounds with non-centrosymmetric Th7Fe3 structure, Journal of the Less Common Metals 32, 91-96 (1973).  
_cited as the source of values for this phase_

## GDPD_B2 (Gd–Pd)

- Id: `phase:gd-pd:gdpd-b2`; status `assigned`
- Structure: CsCl · B2 · cP2 · Pm-3m (221); type `st:b2-cscl-cp2`; tier A: standard phase name; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 1272.74–1653.64 K, x(Pd) 0.49367–0.5
- Literature: 10 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gdpd-b2)

Names (3): _corpus: _corpus:phase:gd-pd:gdpd-b2  
_paper: _paper:10.1016/s0925-8388(00)01144-0:βGdPd  
_tdb: _tdb:GdPd-00Du.tdb:GDPD_B2  


### TDB models of GDPD_B2 (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GDPD_B2, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
61: PHASE GDPD_B2 % 2 1 1 !
62: CONST GDPD_B2 : GD : GD PD% : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(74)90221-5](https://doi.org/10.1016/0022-5088%2874%2990221-5) A. Palenzona, A. Iandelli, The crystal structure and lattice constants of RE3Pd4, Y3Pd4 and Th3Pd4 compounds, Journal of the Less Common Metals 34, 121-124 (1974).  
_cited as the source of values for this phase_

## GDPD_B33 (Gd–Pd)

- Id: `phase:gd-pd:gdpd-b33`; status `assigned`
- Structure: CrB · B33 · oC8 · Cmcm (63); type `st:b33-crb-oc8`; tier A: standard phase name; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 300–1308.64 K, x(Pd) 0.49138–0.5
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gdpd-b33)

Names (3): _corpus: _corpus:phase:gd-pd:gdpd-b33  
_paper: _paper:10.1016/s0925-8388(00)01144-0:αGdPd  
_tdb: _tdb:GdPd-00Du.tdb:GDPD_B33  


### TDB models of GDPD_B33 (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GDPD_B33, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
56: PHASE GDPD_B33 % 2 1 1 !
57: CONST GDPD_B33 : GD : GD PD% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_

## GDPD2 (Gd–Pd)

- Id: `phase:gd-pd:gdpd2`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (literature_printed): (GdPd2) · ? — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (GdPd2) — Hallstedt 2025 mmc2 row for GDPD2: GdPd2
- Stoichiometry: Gd 0.3333, Pd 0.6667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1498.4 K, x(Pd) 0.66667–0.66667
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gdpd2)

Names (3): _corpus: _corpus:phase:gd-pd:gdpd2  
_paper: _paper:10.1016/s0925-8388(00)01144-0:GdPd2  
_tdb: _tdb:GdPd-00Du.tdb:GDPD2  


### TDB models of GDPD2 (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GDPD2, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
81: PHASE GDPD2 % 2 1 2 !
82: CONST GDPD2 : GD : PD : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_

## GDPD3_L12 (Gd–Pd)

- Id: `phase:gd-pd:gdpd3-l12`; status `assigned`
- Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type `st:l1-2-aucu3-cp4`; tier A: standard phase name; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 300–1902.24 K, x(Pd) 0.75–0.78474
- Literature: 9 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gdpd3-l12)

Names (3): _corpus: _corpus:phase:gd-pd:gdpd3-l12  
_paper: _paper:10.1016/s0925-8388(00)01144-0:GdPd3  
_tdb: _tdb:GdPd-00Du.tdb:GDPD3_L12  


### TDB models of GDPD3_L12 (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GDPD3_L12, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
86: PHASE GDPD3_L12 % 2 1 3 !
87: CONST GDPD3_L12 : GD% PD : PD : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(88)90045-8](https://doi.org/10.1016/0022-5088%2888%2990045-8) Y Sakamoto, K Takao, M Yoshida, Ted B Flanagan, Evidence for an ordered Pd7Gd phase in PdGd alloys, Journal of the Less Common Metals 143, 207-218 (1988).  
_cited as the source of values for this phase_

## GDPD7 (Gd–Pd)

- Id: `phase:gd-pd:gdpd7`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_mp; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (dft_oqmd): Fm-3m (225) — on-hull OQMD Gd1 Pd7 at x(PD)=0.8750
- Candidate (literature_printed): (GdPd7) · ? — printed with a label mapped to this phase
- Candidate (sgte_mmc2): (GdPd7) — Hallstedt 2025 mmc2 row for GDPD7: GdPd7
- Stoichiometry: Gd 0.1250, Pd 0.8750
- Stability: stable in 1 of 1 calculated diagram(s): 300–810 K, x(Pd) 0.875–0.875
- Literature: 3 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:gdpd7)

Names (3): _corpus: _corpus:phase:gd-pd:gdpd7  
_paper: _paper:10.1016/s0925-8388(00)01144-0:GdPd7  
_tdb: _tdb:GdPd-00Du.tdb:GDPD7  


### TDB models of GDPD7 (1): PHASE and CONSTITUENT statements as written

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): GDPD7, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
91: PHASE GDPD7 % 2 1 7 !
92: CONST GDPD7 : GD : PD : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(88)90045-8](https://doi.org/10.1016/0022-5088%2888%2990045-8) Y Sakamoto, K Takao, M Yoshida, Ted B Flanagan, Evidence for an ordered Pd7Gd phase in PdGd alloys, Journal of the Less Common Metals 143, 207-218 (1988).  
_cited as the source of values for this phase_

## HCP_A3 (Gd–Pd)

- Id: `phase:gd-pd: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): 300–1562.77 K, x(Pd) 0–0.03639
- Literature: 6 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:hcp-a3)

Names (3): _corpus: _corpus:phase:gd-pd:hcp-a3  
_paper: _paper:10.1016/s0925-8388(00)01144-0:hcp(Gd)  
_tdb: _tdb:GdPd-00Du.tdb:HCP_A3  


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

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): HCP_A3, type code %A, sha256 `a7d4cf1a658c9d93…`

~~~~text
41: PHASE HCP_A3 %A 2 1 0.5 !
42: CONST HCP_A3 : GD% PD : VA : !
~~~~

Example references (3 of 3; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(73)90074-x](https://doi.org/10.1016/0022-5088%2873%2990074-x) J.M. Moreau, E. Parthé, Ferromagnetic Gd7Pd3 and other rare-earth-palladium compounds with non-centrosymmetric Th7Fe3 structure, Journal of the Less Common Metals 32, 91-96 (1973).  
_cited as the source of values for this phase_

## LIQUID (Gd–Pd)

- Id: `phase:gd-pd:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 1057.88–2500 K, x(Pd) 0–1
- Literature: 30 values (26 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:gd-pd:liquid)

Names (3): _corpus: _corpus:phase:gd-pd:liquid  
_paper: _paper:10.1016/s0925-8388(00)01144-0:L  
_tdb: _tdb:GdPd-00Du.tdb:LIQUID  


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

[GdPd-00Du.tdb](https://orchid-project.org/data/databases/sgte-binary/GdPd-00Du.tdb): LIQUID, type code %, sha256 `a7d4cf1a658c9d93…`

~~~~text
26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : GD PD : !
~~~~

Example references (4 of 4; assessments first): 

- [doi:10.1016/S0925-8388(00)01144-0](https://doi.org/10.1016/S0925-8388%2800%2901144-0) Z. Du, H. Yang, J. Alloys Compd., 312, 181-88(2000).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/0022-5088(73)90134-3](https://doi.org/10.1016/0022-5088%2873%2990134-3) O. Loebich, E. Raub, Das Magnetische Verhalten der Legierungen des Palladiums mit Gadolinium, Dysprosium und Holmium, Journal of the Less Common Metals 31, 111-118 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(73)90074-x](https://doi.org/10.1016/0022-5088%2873%2990074-x) J.M. Moreau, E. Parthé, Ferromagnetic Gd7Pd3 and other rare-earth-palladium compounds with non-centrosymmetric Th7Fe3 structure, Journal of the Less Common Metals 32, 91-96 (1973).  
_cited as the source of values for this phase_
- [doi:10.1016/0022-5088(74)90221-5](https://doi.org/10.1016/0022-5088%2874%2990221-5) A. Palenzona, A. Iandelli, The crystal structure and lattice constants of RE3Pd4, Y3Pd4 and Th3Pd4 compounds, Journal of the Less Common Metals 34, 121-124 (1974).  
_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).