Pd–Tb phases

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 · full JSON · Pd–Tb system page · Markdown · field reference

Phases of the Pd–Tb system (14)
Phase	Structure	Basis	Stability (calculated)	TDB models
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	1
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	1
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	1
LIQUID phase:pd-tb:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1058.88–2500 K, x(Tb) 0–1	1
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	1
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)	1
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	1
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	1
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	1
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	1
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	1
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	1
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	1
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	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

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: BCC_A2, type code %B, sha256 43768c6793c8196f…

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 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

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: FCC_A1, type code %A, sha256 43768c6793c8196f…

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 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

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: HCP_A3, type code %A, sha256 43768c6793c8196f…

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 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

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: LIQUID, type code %, sha256 43768c6793c8196f…

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 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
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

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: PD21TB10, type code %, sha256 43768c6793c8196f…

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

Example references (1 of 1; assessments first):

doi: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

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: PD2TB3_D5A, type code %, sha256 43768c6793c8196f…

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 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
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

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: PD2TB5, type code %, sha256 43768c6793c8196f…

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

Example references (1 of 1; assessments first):

doi: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

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: PD3TB_L12, type code %, sha256 43768c6793c8196f…

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 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

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: PD3TB2_ALPHA, type code %, sha256 43768c6793c8196f…

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 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

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: PD3TB2_BETA, type code %, sha256 43768c6793c8196f…

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 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

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: PD4TB3, type code %, sha256 43768c6793c8196f…

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

Example references (1 of 1; assessments first):

doi: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

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: PD7TB, type code %, sha256 43768c6793c8196f…

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

Example references (1 of 1; assessments first):

doi: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

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: PDTB_B27, type code %, sha256 43768c6793c8196f…

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 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

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: PDTB_B33, type code %, sha256 43768c6793c8196f…

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 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). doi: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). doi: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.

@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}
}