# Au–Pr phases

> Au–Pr system: 14 phases (tier A 8, tier C 5, liquid 1); 13 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/AU-PR.html · Markdown: https://data.orchid-project.org/phases/pages/AU-PR.md

14 phases (tier A 8, tier C 5, liquid 1); 13 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=AU-PR) · [full JSON](https://data.orchid-project.org/phases/systems/AU-PR.json) · [Au–Pr system page](https://data.orchid-project.org/systems/AU-PR.html) · [Markdown](https://data.orchid-project.org/phases/pages/AU-PR.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

Table: Phases of the Au–Pr system (14)

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [AU2PR](#phase-au-pr-au2pr); _phase:au-pr:au2pr_ | Hg2K · oI12 · Imma (74) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1362.85 K, x(Pr) 0.33333–0.33333 | 4 | 1 |
| [AU36PR17](#phase-au-pr-au36pr17); _phase:au-pr:au36pr17_ | Au36Nd17 · tP106 · P4/nmm (129) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 1273.01–1451.47 K, x(Pr) 0.32075–0.32075 | 8 | 1 |
| [AU4PR3](#phase-au-pr-au4pr3); _phase:au-pr:au4pr3_ | Pd4Pu3 · hR14 · R-3 (148) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1522.87 K, x(Pr) 0.42857–0.42857 | 6 | 1 |
| [AU51PR14](#phase-au-pr-au51pr14); _phase:au-pr:au51pr14_ | Ag51Gd14 · hP68 · P6/m (175) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1482.58 K, x(Pr) 0.21538–0.21538 | 8 | 1 |
| [AU6PR](#phase-au-pr-au6pr); _phase:au-pr:au6pr_ | Au6Pr · mC28 · C2/c (15) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1172.89 K, x(Pr) 0.14286–0.14286 | 6 | 1 |
| [AUPR_B2](#phase-au-pr-aupr-b2); _phase:au-pr:aupr-b2_ | CsCl · B2 · cP2 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1592.95–1692.71 K, x(Pr) 0.5–0.5 | 4 | 1 |
| [AUPR_B27](#phase-au-pr-aupr-b27); _phase:au-pr:aupr-b27_ | FeB · B27 · oP8 · Pnma (62) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–713.23 K, x(Pr) 0.5–0.5 | 2 | 1 |
| [AUPR_B33](#phase-au-pr-aupr-b33); _phase:au-pr:aupr-b33_ | CrB · B33 · oC8 · Cmcm (63) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 713.23–1592.95 K, x(Pr) 0.5–0.5 | 8 | 1 |
| [AUPR2_C37](#phase-au-pr-aupr2-c37); _phase:au-pr:aupr2-c37_ | Co2Si · C37 · oP12 · Pnma (62) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1022.92 K, x(Pr) 0.66667–0.66667 | 4 | 1 |
| [BCC_A2](#phase-au-pr-bcc-a2); _phase:au-pr:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1033.11–1204 K, x(Pr) 0.98527–1 | 2 | 1 |
| [DHCP](#phase-au-pr-dhcp-a3); _phase:au-pr:dhcp-a3_ | alpha-La · A3' · hP4 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1068 K, x(Pr) 0.99479–1 | 4 | 1 |
| [FCC_A1](#phase-au-pr-fcc-a1); _phase:au-pr:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1357.84 K, x(Pr) 0–0.02026 | 2 | 1 |
| [HCP_A3](#phase-au-pr-hcp-a3); _phase:au-pr:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | not stable in 1 calculated diagram(s) | 0 | 1 |
| [LIQUID](#phase-au-pr-liquid); _phase:au-pr:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 882.92–2500 K, x(Pr) 0–1 | 22 | 1 |

## AU2PR (Au–Pr)

- Id: `phase:au-pr:au2pr`; status `assigned`
- Structure: Hg2K · oI12 · Imma (74); type `st:hg2k-oi12`; 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 (dft_space_group_74_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Au 0.6667, Pr 0.3333
- Stability: stable in 1 of 1 calculated diagram(s): 300–1362.85 K, x(Pr) 0.33333–0.33333
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:au2pr)

Names (3): _corpus: _corpus:phase:au-pr:au2pr  
_paper: _paper:10.1016/s0925-8388(03)00525-5:Au2Pr  
_tdb: _tdb:AuPr-04Du.tdb:AU2PR  


### TDB models of AU2PR (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AU2PR, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
68: PHASE AU2PR % 2 2 1 !
69: CONST AU2PR : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## AU36PR17 (Au–Pr)

- Id: `phase:au-pr:au36pr17`; status `assigned`
- Structure: Au36Nd17 · tP106 · P4/nmm (129); type `st:au36nd17-tp106`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Au 0.6792, Pr 0.3208
- Stability: stable in 1 of 1 calculated diagram(s): 1273.01–1451.47 K, x(Pr) 0.32075–0.32075
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:au36pr17)

Names (3): _corpus: _corpus:phase:au-pr:au36pr17  
_paper: _paper:10.1016/s0925-8388(03)00525-5:Au36Pr17  
_tdb: _tdb:AuPr-04Du.tdb:AU36PR17  


### TDB models of AU36PR17 (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AU36PR17, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
63: PHASE AU36PR17 % 2 36 17 !
64: CONST AU36PR17 : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## AU4PR3 (Au–Pr)

- Id: `phase:au-pr:au4pr3`; 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_on_hull_entry_in_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Au 0.5714, Pr 0.4286
- Stability: stable in 1 of 1 calculated diagram(s): 300–1522.87 K, x(Pr) 0.42857–0.42857
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:au4pr3)

Names (3): _corpus: _corpus:phase:au-pr:au4pr3  
_paper: _paper:10.1016/s0925-8388(03)00525-5:Au4Pr3  
_tdb: _tdb:AuPr-04Du.tdb:AU4PR3  


### TDB models of AU4PR3 (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AU4PR3, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
73: PHASE AU4PR3 % 2 4 3 !
74: CONST AU4PR3 : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## AU51PR14 (Au–Pr)

- Id: `phase:au-pr:au51pr14`; status `assigned`
- Structure: Ag51Gd14 · hP68 · P6/m (175); type `st:ag51gd14-hp68`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Au 0.7846, Pr 0.2154
- Stability: stable in 1 of 1 calculated diagram(s): 300–1482.58 K, x(Pr) 0.21538–0.21538
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:au51pr14)

Names (3): _corpus: _corpus:phase:au-pr:au51pr14  
_paper: _paper:10.1016/s0925-8388(03)00525-5:Au51Pr14  
_tdb: _tdb:AuPr-04Du.tdb:AU51PR14  


### TDB models of AU51PR14 (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AU51PR14, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
58: PHASE AU51PR14 % 2 51 14 !
59: CONST AU51PR14 : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## AU6PR (Au–Pr)

- Id: `phase:au-pr:au6pr`; status `assigned`
- Structure: Au6Pr · mC28 · C2/c (15); type `st:au6pr-mc28`; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
- Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) [doi:10.1016/j.calphad.2025.102833](https://doi.org/10.1016/j.calphad.2025.102833)
- Caveat: not certain from the name or DFT alone (no_on_hull_entry_in_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
- Stoichiometry: Au 0.8571, Pr 0.1429
- Stability: stable in 1 of 1 calculated diagram(s): 300–1172.89 K, x(Pr) 0.14286–0.14286
- Literature: 6 values (6 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:au6pr)

Names (3): _corpus: _corpus:phase:au-pr:au6pr  
_paper: _paper:10.1016/s0925-8388(03)00525-5:Au6Pr  
_tdb: _tdb:AuPr-04Du.tdb:AU6PR  


### TDB models of AU6PR (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AU6PR, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
53: PHASE AU6PR % 2 6 1 !
54: CONST AU6PR : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## AUPR_B2 (Au–Pr)

- Id: `phase:au-pr:aupr-b2`; status `assigned`
- Structure: CsCl · B2 · cP2 · Pm-3m (221); type `st:b2-cscl-cp2`; tier A: standard phase name; confidence high
- Stoichiometry: Au 0.5000, Pr 0.5000
- Stability: stable in 1 of 1 calculated diagram(s): 1592.95–1692.71 K, x(Pr) 0.5–0.5
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:aupr-b2)

Names (3): _corpus: _corpus:phase:au-pr:aupr-b2  
_paper: _paper:10.1016/s0925-8388(03)00525-5:γAuPr  
_tdb: _tdb:AuPr-04Du.tdb:AUPR_B2  


### TDB models of AUPR_B2 (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AUPR_B2, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
88: PHASE AUPR_B2 % 2 1 1 !
89: CONST AUPR_B2 : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## AUPR_B27 (Au–Pr)

- Id: `phase:au-pr:aupr-b27`; status `assigned`
- Structure: FeB · B27 · oP8 · Pnma (62); type `st:b27-feb-op8`; tier A: standard phase name; confidence high
- Stoichiometry: Au 0.5000, Pr 0.5000
- Stability: stable in 1 of 1 calculated diagram(s): 300–713.23 K, x(Pr) 0.5–0.5
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:aupr-b27)

Names (3): _corpus: _corpus:phase:au-pr:aupr-b27  
_paper: _paper:10.1016/s0925-8388(03)00525-5:αAuPr  
_tdb: _tdb:AuPr-04Du.tdb:AUPR_B27  


### TDB models of AUPR_B27 (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AUPR_B27, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
78: PHASE AUPR_B27 % 2 1 1 !
79: CONST AUPR_B27 : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## AUPR_B33 (Au–Pr)

- Id: `phase:au-pr:aupr-b33`; status `assigned`
- Structure: CrB · B33 · oC8 · Cmcm (63); type `st:b33-crb-oc8`; tier A: standard phase name; confidence high
- Stoichiometry: Au 0.5000, Pr 0.5000
- Stability: stable in 1 of 1 calculated diagram(s): 713.23–1592.95 K, x(Pr) 0.5–0.5
- Literature: 8 values (8 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:aupr-b33)

Names (3): _corpus: _corpus:phase:au-pr:aupr-b33  
_paper: _paper:10.1016/s0925-8388(03)00525-5:βAuPr  
_tdb: _tdb:AuPr-04Du.tdb:AUPR_B33  


### TDB models of AUPR_B33 (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AUPR_B33, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
83: PHASE AUPR_B33 % 2 1 1 !
84: CONST AUPR_B33 : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## AUPR2_C37 (Au–Pr)

- Id: `phase:au-pr:aupr2-c37`; status `assigned`
- Structure: Co2Si · C37 · oP12 · Pnma (62); type `st:c37-co2si-op12`; tier A: standard phase name; confidence high
- Caveat: DFT agrees: on-hull mp-aaaaaeak and oqmd-10794, space group 62
- Stoichiometry: Au 0.3333, Pr 0.6667
- Stability: stable in 1 of 1 calculated diagram(s): 300–1022.92 K, x(Pr) 0.66667–0.66667
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:aupr2-c37)

Names (5): _corpus: _corpus:phase:au-pr:aupr2-c37  
_mp: _mp:mp-aaaaaeak  
_oqmd: _oqmd:oqmd-10794  
_paper: _paper:10.1016/s0925-8388(03)00525-5:AuPr2  
_tdb: _tdb:AuPr-04Du.tdb:AUPR2_C37  


### TDB models of AUPR2_C37 (1): PHASE and CONSTITUENT statements as written

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): AUPR2_C37, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
93: PHASE AUPR2_C37 % 2 1 2 !
94: CONST AUPR2_C37 : AU : PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## BCC_A2 (Au–Pr)

- Id: `phase:au-pr: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): 1033.11–1204 K, x(Pr) 0.98527–1
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:bcc-a2)

Names (3): _corpus: _corpus:phase:au-pr:bcc-a2  
_paper: _paper:10.1016/s0925-8388(03)00525-5:bcc(Pr)  
_tdb: _tdb:AuPr-04Du.tdb:BCC_A2  


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

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): BCC_A2, type code %B, sha256 `0faf40a50a1ef45c…`

~~~~text
38: PHASE BCC_A2 %B 2 1 3 !
39: CONST BCC_A2 : AU PR : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## DHCP (Au–Pr)

- Id: `phase:au-pr:dhcp-a3`; status `assigned`
- Structure: alpha-La · A3' · hP4 · P6_3/mmc (194); type `st:a3-alpha-la-hp4`; tier A: standard phase name; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 300–1068 K, x(Pr) 0.99479–1
- Literature: 4 values (4 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:dhcp-a3)

Names (4): _corpus: _corpus:phase:au-pr:dhcp-a3, corpus:phase:au-pr:dhcp  
_paper: _paper:10.1016/s0925-8388(03)00525-5:dhcp (Pr)  
_tdb: _tdb:AuPr-04Du.tdb:DHCP  


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

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): DHCP, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
48: PHASE DHCP % 1 1 !
49: CONST DHCP : AU PR% : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## FCC_A1 (Au–Pr)

- Id: `phase:au-pr: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): 300–1357.84 K, x(Pr) 0–0.02026
- Literature: 2 values (2 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:fcc-a1)

Names (3): _corpus: _corpus:phase:au-pr:fcc-a1  
_paper: _paper:10.1016/s0925-8388(03)00525-5:fcc (Au)  
_tdb: _tdb:AuPr-04Du.tdb:FCC_A1  


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

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): FCC_A1, type code %A, sha256 `0faf40a50a1ef45c…`

~~~~text
33: PHASE FCC_A1 %A 2 1 1 !
34: CONST FCC_A1 : AU% PR : VA : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_cited as the source of values for this phase_

## HCP_A3 (Au–Pr)

- Id: `phase:au-pr:hcp-a3`; status `assigned`
- Structure: Mg · A3 · hP2 · P6_3/mmc (194); type `st:a3-mg-hp2`; tier A: standard phase name; confidence high
- Stoichiometry: Au 1.0000
- Stability: not stable in 1 calculated diagram(s)
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:hcp-a3)

Names (2): _corpus: _corpus:phase:au-pr:hcp-a3  
_tdb: _tdb:AuPr-04Du.tdb:HCP_A3  


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

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): HCP_A3, type code %A, sha256 `0faf40a50a1ef45c…`

~~~~text
43: PHASE HCP_A3 %A 2 1 0.5 !
44: CONST HCP_A3 : AU : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase_

## LIQUID (Au–Pr)

- Id: `phase:au-pr:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 882.92–2500 K, x(Pr) 0–1
- Literature: 22 values (22 accepted) from 1 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:au-pr:liquid)

Names (3): _corpus: _corpus:phase:au-pr:liquid  
_paper: _paper:10.1016/s0925-8388(03)00525-5:L  
_tdb: _tdb:AuPr-04Du.tdb:LIQUID  


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

[AuPr-04Du.tdb](https://orchid-project.org/data/databases/sgte-binary/AuPr-04Du.tdb): LIQUID, type code %, sha256 `0faf40a50a1ef45c…`

~~~~text
28: PHASE LIQUID:L % 1 1 !
29: CONST LIQUID:L : AU PR : !
~~~~

Example references (2 of 2; assessments first): 

- [doi:10.1016/S0925-8388(03)00525-5](https://doi.org/10.1016/S0925-8388%2803%2900525-5) Z. Du, C. Guo, D. Lu, J. Alloys Compd., 364, 117-20(2004).  
_assessment that models this phase; reports values for this phase_
- [doi:10.1016/s0925-8388(96)02606-0](https://doi.org/10.1016/s0925-8388%2896%2902606-0) A. Saccone, D. Macciò, M. Giovannini, S. Delfino, The praseodymium-gold system, Journal of Alloys and Compounds 247, 134-140 (1997).  
_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).