# Pd–Tb phases

> Pd–Tb system: 14 phases (tier A 7, tier B 1, tier C 2, liquid 1, needs_review 3); 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/PD-TB.html · Markdown: https://data.orchid-project.org/phases/pages/PD-TB.md

14 phases (tier A 7, tier B 1, tier C 2, liquid 1, needs_review 3); 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=PD-TB) · [full JSON](https://data.orchid-project.org/phases/systems/PD-TB.json) · [Pd–Tb system page](https://data.orchid-project.org/systems/PD-TB.html) · [Markdown](https://data.orchid-project.org/phases/pages/PD-TB.md) · [field reference](https://data.orchid-project.org/phases/SCHEMA.md)

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

| Phase | Structure | Basis | Stability (calculated) | Literature values | TDB models |
|---|---|---|---|---:|---:|
| [BCC_A2](#phase-pd-tb-bcc-a2); _phase:pd-tb:bcc-a2_ | W · A2 · cI2 · Im-3m (229) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 347–2499.5 K, x(Tb) 1–1 | 0 | 1 |
| [FCC_A1](#phase-pd-tb-fcc-a1); _phase:pd-tb:fcc-a1_ | Cu · A1 · cF4 · Fm-3m (225) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1828 K, x(Tb) 0–0.11405 | 0 | 1 |
| [HCP_A3](#phase-pd-tb-hcp-a3); _phase:pd-tb:hcp-a3_ | Mg · A3 · hP2 · P6_3/mmc (194) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1562 K, x(Tb) 1–1 | 0 | 1 |
| [LIQUID](#phase-pd-tb-liquid); _phase:pd-tb:liquid_ | liquid | liquid | stable in 1 of 1 calculated diagram(s): 1058.88–2500 K, x(Tb) 0–1 | 0 | 1 |
| [PD21TB10](#phase-pd-tb-pd21tb10); _phase:pd-tb:pd21tb10_ | Pd21Sm10 · mC124 · C2/m (12) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1552.55 K, x(Tb) 0.32258–0.32258 | 0 | 1 |
| [PD2TB3_D5A](#phase-pd-tb-pd2tb3-d5a); _phase:pd-tb:pd2tb3-d5a_ | Si2U3 · D5_a · tP10 · P4/mbm (127) | tier A: standard phase name | not stable in 1 calculated diagram(s) | 0 | 1 |
| [PD2TB5](#phase-pd-tb-pd2tb5); _phase:pd-tb:pd2tb5_ | Dy5Pd2 · cF144 · Fd-3m (227) | tier C: assessor-stated (Hallstedt 2025 crystallographic table) | stable in 1 of 1 calculated diagram(s): 300–1133.2 K, x(Tb) 0.71429–0.71429 | 0 | 1 |
| [PD3TB_L12](#phase-pd-tb-pd3tb-l12); _phase:pd-tb:pd3tb-l12_ | AuCu3 · L1_2 · cP4 · Pm-3m (221) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1943.82 K, x(Tb) 0.21658–0.25 | 0 | 1 |
| [PD3TB2_ALPHA](#phase-pd-tb-pd3tb2-alpha); _phase:pd-tb:pd3tb2-alpha_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–1391.46 K, x(Tb) 0.4–0.4 | 0 | 1 |
| [PD3TB2_BETA](#phase-pd-tb-pd3tb2-beta); _phase:pd-tb:pd3tb2-beta_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 1391.46–1472.69 K, x(Tb) 0.4–0.4 | 0 | 1 |
| [PD4TB3](#phase-pd-tb-pd4tb3); _phase:pd-tb:pd4tb3_ | Pd4Pu3 · hR14 · R-3 (148) | tier B: DFT-supported (unique MP + OQMD match) | stable in 1 of 1 calculated diagram(s): 300–1641.57 K, x(Tb) 0.42857–0.42857 | 0 | 1 |
| [PD7TB](#phase-pd-tb-pd7tb); _phase:pd-tb:pd7tb_ |  | needs_review | stable in 1 of 1 calculated diagram(s): 300–783.04 K, x(Tb) 0.125–0.125 | 0 | 1 |
| [PDTB_B27](#phase-pd-tb-pdtb-b27); _phase:pd-tb:pdtb-b27_ | FeB · B27 · oP8 · Pnma (62) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 1120.88–1693.24 K, x(Tb) 0.5–0.50356 | 0 | 1 |
| [PDTB_B33](#phase-pd-tb-pdtb-b33); _phase:pd-tb:pdtb-b33_ | CrB · B33 · oC8 · Cmcm (63) | tier A: standard phase name | stable in 1 of 1 calculated diagram(s): 300–1171.33 K, x(Tb) 0.5–0.50473 | 0 | 1 |

## BCC_A2 (Pd–Tb)

- Id: `phase:pd-tb: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): 347–2499.5 K, x(Tb) 1–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:bcc-a2)

Names (2): _corpus: _corpus:phase:pd-tb:bcc-a2  
_tdb: _tdb:PdTb-00Du-LB.tdb:BCC_A2  


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

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): BCC_A2, type code %B, sha256 `43768c6793c8196f…`

~~~~text
32: PHASE BCC_A2 %B 2 1 3 !
33: CONST BCC_A2 : PD TB% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## FCC_A1 (Pd–Tb)

- Id: `phase:pd-tb: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): 300–1828 K, x(Tb) 0–0.11405
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:fcc-a1)

Names (2): _corpus: _corpus:phase:pd-tb:fcc-a1  
_tdb: _tdb:PdTb-00Du-LB.tdb:FCC_A1  


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

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): FCC_A1, type code %A, sha256 `43768c6793c8196f…`

~~~~text
27: PHASE FCC_A1 %A 2 1 1 !
28: CONST FCC_A1 : PD% TB : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## HCP_A3 (Pd–Tb)

- Id: `phase:pd-tb: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 K, x(Tb) 1–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:hcp-a3)

Names (2): _corpus: _corpus:phase:pd-tb:hcp-a3  
_tdb: _tdb:PdTb-00Du-LB.tdb:HCP_A3  


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

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): HCP_A3, type code %A, sha256 `43768c6793c8196f…`

~~~~text
37: PHASE HCP_A3 %A 2 1 0.5 !
38: CONST HCP_A3 : PD TB% : VA : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## LIQUID (Pd–Tb)

- Id: `phase:pd-tb:liquid`; status `assigned`
- Structure: liquid; type `st:liquid`; liquid; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 1058.88–2500 K, x(Tb) 0–1
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:liquid)

Names (2): _corpus: _corpus:phase:pd-tb:liquid  
_tdb: _tdb:PdTb-00Du-LB.tdb:LIQUID  


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

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): LIQUID, type code %, sha256 `43768c6793c8196f…`

~~~~text
22: PHASE LIQUID:L % 1 1 !
23: CONST LIQUID:L : PD TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PD21TB10 (Pd–Tb)

- Id: `phase:pd-tb:pd21tb10`; status `assigned`
- Structure: Pd21Sm10 · mC124 · C2/m (12); type `st:pd21sm10-mc124`; 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: Pd 0.6774, Tb 0.3226
- Stability: stable in 1 of 1 calculated diagram(s): 300–1552.55 K, x(Tb) 0.32258–0.32258
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pd21tb10)

Names (2): _corpus: _corpus:phase:pd-tb:pd21tb10  
_tdb: _tdb:PdTb-00Du-LB.tdb:PD21TB10  


### TDB models of PD21TB10 (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PD21TB10, type code %, sha256 `43768c6793c8196f…`

~~~~text
52: PHASE PD21TB10 % 2 21 10 !
53: CONST PD21TB10 : PD : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PD2TB3_D5A (Pd–Tb)

- Id: `phase:pd-tb:pd2tb3-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: Pd 0.4000, Tb 0.6000
- 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:pd-tb:pd2tb3-d5a)

Names (2): _corpus: _corpus:phase:pd-tb:pd2tb3-d5a  
_tdb: _tdb:PdTb-00Du-LB.tdb:PD2TB3_D5A  


### TDB models of PD2TB3_D5A (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PD2TB3_D5A, type code %, sha256 `43768c6793c8196f…`

~~~~text
82: PHASE PD2TB3_D5A % 2 2 3 !
83: CONST PD2TB3_D5A : PD : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PD2TB5 (Pd–Tb)

- Id: `phase:pd-tb:pd2tb5`; status `assigned`
- Structure: Dy5Pd2 · cF144 · Fd-3m (227); type `st:dy5pd2-cf144`; 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: Pd 0.2857, Tb 0.7143
- Stability: stable in 1 of 1 calculated diagram(s): 300–1133.2 K, x(Tb) 0.71429–0.71429
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pd2tb5)

Names (2): _corpus: _corpus:phase:pd-tb:pd2tb5  
_tdb: _tdb:PdTb-00Du-LB.tdb:PD2TB5  


### TDB models of PD2TB5 (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PD2TB5, type code %, sha256 `43768c6793c8196f…`

~~~~text
87: PHASE PD2TB5 % 2 2 5 !
88: CONST PD2TB5 : PD : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PD3TB_L12 (Pd–Tb)

- Id: `phase:pd-tb:pd3tb-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): 300–1943.82 K, x(Tb) 0.21658–0.25
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pd3tb-l12)

Names (2): _corpus: _corpus:phase:pd-tb:pd3tb-l12  
_tdb: _tdb:PdTb-00Du-LB.tdb:PD3TB_L12  


### TDB models of PD3TB_L12 (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PD3TB_L12, type code %, sha256 `43768c6793c8196f…`

~~~~text
47: PHASE PD3TB_L12 % 2 3 1 !
48: CONST PD3TB_L12 : PD : PD TB% : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PD3TB2_ALPHA (Pd–Tb)

- Id: `phase:pd-tb:pd3tb2-alpha`; status `needs_review`
- No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
- Candidate (sgte_mmc2): (Pd3Tb2-alpha) — Hallstedt 2025 mmc2 row for PD3TB2_ALPHA: Pd3Tb2-alpha
- Stoichiometry: Pd 0.6000, Tb 0.4000
- Stability: stable in 1 of 1 calculated diagram(s): 300–1391.46 K, x(Tb) 0.4–0.4
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pd3tb2-alpha)

Names (2): _corpus: _corpus:phase:pd-tb:pd3tb2-alpha  
_tdb: _tdb:PdTb-00Du-LB.tdb:PD3TB2_ALPHA  


### TDB models of PD3TB2_ALPHA (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PD3TB2_ALPHA, type code %, sha256 `43768c6793c8196f…`

~~~~text
57: PHASE PD3TB2_ALPHA % 2 3 2 !
58: CONST PD3TB2_ALPHA : PD : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PD3TB2_BETA (Pd–Tb)

- Id: `phase:pd-tb:pd3tb2-beta`; status `needs_review`
- No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
- Candidate (sgte_mmc2): (Pd3Tb2-beta) — Hallstedt 2025 mmc2 row for PD3TB2_BETA: Pd3Tb2-beta
- Stoichiometry: Pd 0.6000, Tb 0.4000
- Stability: stable in 1 of 1 calculated diagram(s): 1391.46–1472.69 K, x(Tb) 0.4–0.4
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pd3tb2-beta)

Names (2): _corpus: _corpus:phase:pd-tb:pd3tb2-beta  
_tdb: _tdb:PdTb-00Du-LB.tdb:PD3TB2_BETA  


### TDB models of PD3TB2_BETA (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PD3TB2_BETA, type code %, sha256 `43768c6793c8196f…`

~~~~text
62: PHASE PD3TB2_BETA % 2 3 2 !
63: CONST PD3TB2_BETA : PD : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PD4TB3 (Pd–Tb)

- Id: `phase:pd-tb:pd4tb3`; status `assigned`
- Structure: Pd4Pu3 · hR14 · R-3 (148); type `st:pd4pu3-hr14`; tier B: DFT-supported (unique MP + OQMD match); confidence high
- Stoichiometry: Pd 0.5714, Tb 0.4286
- Stability: stable in 1 of 1 calculated diagram(s): 300–1641.57 K, x(Tb) 0.42857–0.42857
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pd4tb3)

Names (4): _corpus: _corpus:phase:pd-tb:pd4tb3  
_mp: _mp:mp-aaackvgy  
_oqmd: _oqmd:oqmd-1437088  
_tdb: _tdb:PdTb-00Du-LB.tdb:PD4TB3  


### TDB models of PD4TB3 (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PD4TB3, type code %, sha256 `43768c6793c8196f…`

~~~~text
67: PHASE PD4TB3 % 2 4 3 !
68: CONST PD4TB3 : PD : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PD7TB (Pd–Tb)

- Id: `phase:pd-tb:pd7tb`; status `needs_review`
- No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
- Candidate (sgte_mmc2): (Pd7Tb) — Hallstedt 2025 mmc2 row for PD7TB: Pd7Tb
- Stoichiometry: Pd 0.8750, Tb 0.1250
- Stability: stable in 1 of 1 calculated diagram(s): 300–783.04 K, x(Tb) 0.125–0.125
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pd7tb)

Names (2): _corpus: _corpus:phase:pd-tb:pd7tb  
_tdb: _tdb:PdTb-00Du-LB.tdb:PD7TB  


### TDB models of PD7TB (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PD7TB, type code %, sha256 `43768c6793c8196f…`

~~~~text
42: PHASE PD7TB % 2 7 1 !
43: CONST PD7TB : PD : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PDTB_B27 (Pd–Tb)

- Id: `phase:pd-tb:pdtb-b27`; status `assigned`
- Structure: FeB · B27 · oP8 · Pnma (62); type `st:b27-feb-op8`; tier A: standard phase name; confidence high
- Stability: stable in 1 of 1 calculated diagram(s): 1120.88–1693.24 K, x(Tb) 0.5–0.50356
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pdtb-b27)

Names (2): _corpus: _corpus:phase:pd-tb:pdtb-b27  
_tdb: _tdb:PdTb-00Du-LB.tdb:PDTB_B27  


### TDB models of PDTB_B27 (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PDTB_B27, type code %, sha256 `43768c6793c8196f…`

~~~~text
77: PHASE PDTB_B27 % 2 1 1 !
78: CONST PDTB_B27 : PD% TB : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## PDTB_B33 (Pd–Tb)

- Id: `phase:pd-tb:pdtb-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): 300–1171.33 K, x(Tb) 0.5–0.50473
- Literature: 0 values (0 accepted) from 0 papers
- Interactive: [phase registry entry](https://orchid-project.org/phases/#phase:pd-tb:pdtb-b33)

Names (2): _corpus: _corpus:phase:pd-tb:pdtb-b33  
_tdb: _tdb:PdTb-00Du-LB.tdb:PDTB_B33  


### TDB models of PDTB_B33 (1): PHASE and CONSTITUENT statements as written

[PdTb-00Du-LB.tdb](https://orchid-project.org/data/databases/sgte-binary/PdTb-00Du-LB.tdb): PDTB_B33, type code %, sha256 `43768c6793c8196f…`

~~~~text
72: PHASE PDTB_B33 % 2 1 1 !
73: CONST PDTB_B33 : PD% TB : TB : !
~~~~

Example references (1 of 1; assessments first): 

- [doi:10.1515/ijmr-2000-911204](https://doi.org/10.1515/ijmr-2000-911204) Z. Du, H. Yang, K. Han, Z. Metallkd., 91, 988-91(2000).  
_assessment that models this phase_

## Please cite

- R. Arróyave, J. Saal, D. Shin, ORCHID-Registry: phase registry of binary systems (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23735970
- R. Arróyave, J. Saal, D. Shin, ORCHID data: umbrella record of the ORCHID datasets (version 2026.10; Version 1, machine-extracted), Zenodo (2026). https://doi.org/10.5281/zenodo.23736065

Also cite B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, https://doi.org/10.1016/j.calphad.2025.102833 (CC BY 4.0), and the original assessment named in each file; A. Jain et al., The Materials Project: A materials genome approach to accelerating materials innovation, APL Materials 1 (2013) 011002, https://doi.org/10.1063/1.4812323 (CC BY 4.0); J. E. Saal et al., JOM 65 (2013) 1501, https://doi.org/10.1007/s11837-013-0755-4 and S. Kirklin et al., npj Comput. Mater. 1 (2015) 15010, https://doi.org/10.1038/npjcompumats.2015.10 (CC BY 4.0); the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work).

Version 1, machine-extracted: values were read by language-model readers constrained to quote their source and checked automatically, and the release was then audited on the printed pages by adversarial audits, an independent second review of fit-facing records and a preliminary human review of a frozen sample. Flags such as accepted and ESPEI-ready record screening results, not certification; known issues are listed in the release notes.

```bibtex
@misc{orchid_phase_registry_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Registry: phase registry of binary systems}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735970},
  url       = {https://doi.org/10.5281/zenodo.23735970},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_data_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID data: umbrella record of the ORCHID datasets}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23736065},
  url       = {https://doi.org/10.5281/zenodo.23736065},
  note      = {Version 1, machine-extracted}
}
```

---

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