Mg–Tb phases

9 phases (tier A 6, tier C 2, liquid 1); 7 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 · Mg–Tb system page · Markdown · field reference

Phases of the Mg–Tb system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:mg-tb:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	4	1
B2_BCC phase:mg-tb:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2499.1 K, x(Tb) 0.4723–1	6	1
MG3M_D03 phase:mg-tb:d03-mg3m	BiF3 · D0_3 · cF16 · Fm-3m (225)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–877.78 K, x(Tb) 0.21023–0.25	4	1
FCC_A1 phase:mg-tb:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
HCP_A3 phase:mg-tb:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1567.44 K, x(Tb) 0–1	4	1
LIQUID phase:mg-tb:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 803.32–2500 K, x(Tb) 0–1	12	1
MG24TB5_A12 phase:mg-tb:mg24tb5-a12	alpha-Mn · A12 · cI58 · I-43m (217)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–827.77 K, x(Tb) 0.17241–0.17241	4	1
MG2TB_C14 phase:mg-tb:mg2tb-c14	MgZn2 · C14 · hP12 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–992.86 K, x(Tb) 0.32045–0.33333	4	1
MG5M phase:mg-tb:mg5m	Cd45Sm11 · cF448 · F-43m (216)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–817.81 K, x(Tb) 0.16667–0.16667	4	1

BCC_A2 (Mg–Tb)

Id: phase:mg-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: not stable in 1 calculated diagram(s)
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-tb:bcc-a2
paper: paper:10.1016/j.jallcom.2005.11.060:bcc(Tb)
tdb: tdb:MgTb-06Guo.tdb:BCC_A2

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

MgTb-06Guo.tdb: BCC_A2, type code %B, sha256 69acc44761df0f6c…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : MG TB% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase; reports values for this phase

B2_BCC (Mg–Tb)

Id: phase:mg-tb:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: MgTb-06Guo.tdb: ordered phase with disordered part BCC_A2 (order/disorder model)
Caveat: partitioned order/disorder model in MgTb-06Guo.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2499.1 K, x(Tb) 0.4723–1
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-tb:bcc-b2, corpus:phase:mg-tb:b2-bcc
paper: paper:10.1016/j.jallcom.2005.11.060:MgTb
tdb: tdb:MgTb-06Guo.tdb:B2_BCC

TDB models of B2_BCC (1): PHASE and CONSTITUENT statements as written

MgTb-06Guo.tdb: B2_BCC, type code %BO, sha256 69acc44761df0f6c…

35: PHASE B2_BCC %BO 3 0.5 0.5 3 !
36: CONST B2_BCC : MG% TB : MG TB% : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase; reports values for this phase

MG3M_D03 (Mg–Tb)

Id: phase:mg-tb:d03-mg3m; status assigned
Structure: BiF3 · D0_3 · cF16 · Fm-3m (225); type st:d0-3-bif3-cf16; 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 (unrecognised_name_tokens:MG3M); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–877.78 K, x(Tb) 0.21023–0.25
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-tb:d03-mg3m, corpus:phase:mg-tb:mg3m-d03
paper: paper:10.1016/j.jallcom.2005.11.060:Mg3Tb
tdb: tdb:MgTb-06Guo.tdb:MG3M_D03

TDB models of MG3M_D03 (1): PHASE and CONSTITUENT statements as written

MgTb-06Guo.tdb: MG3M_D03, type code %, sha256 69acc44761df0f6c…

56: PHASE MG3M_D03 % 2 3 1 !
57: CONST MG3M_D03 : MG : MG TB% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase; reports values for this phase

FCC_A1 (Mg–Tb)

Id: phase:mg-tb:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Mg 1.0000
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:mg-tb:fcc-a1
tdb: tdb:MgTb-06Guo.tdb:FCC_A1

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

MgTb-06Guo.tdb: FCC_A1, type code %A, sha256 69acc44761df0f6c…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase

HCP_A3 (Mg–Tb)

Id: phase:mg-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): 300–1567.44 K, x(Tb) 0–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:mg-tb:hcp-a3
paper: paper:10.1016/j.jallcom.2005.11.060:hcp, paper:10.1016/j.jallcom.2005.11.060:hcp(Tb)
tdb: tdb:MgTb-06Guo.tdb:HCP_A3

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

MgTb-06Guo.tdb: HCP_A3, type code %A, sha256 69acc44761df0f6c…

40: PHASE HCP_A3 %A 2 1 0.5 !
41: CONST HCP_A3 : MG TB : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase; reports values for this phase

LIQUID (Mg–Tb)

Id: phase:mg-tb:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 803.32–2500 K, x(Tb) 0–1
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-tb:liquid
paper: paper:10.1016/j.jallcom.2005.11.060:liq.
tdb: tdb:MgTb-06Guo.tdb:LIQUID

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

MgTb-06Guo.tdb: LIQUID, type code %, sha256 69acc44761df0f6c…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : MG TB : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase; reports values for this phase

MG24TB5_A12 (Mg–Tb)

Id: phase:mg-tb:mg24tb5-a12; status assigned
Structure: alpha-Mn · A12 · cI58 · I-43m (217); type st:a12-alpha-mn-ci58; tier A: standard phase name; confidence high
Stoichiometry: Mg 0.8276, Tb 0.1724
Stability: stable in 1 of 1 calculated diagram(s): 300–827.77 K, x(Tb) 0.17241–0.17241
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-tb:mg24tb5-a12
paper: paper:10.1016/j.jallcom.2005.11.060:Mg24Tb5
tdb: tdb:MgTb-06Guo.tdb:MG24TB5_A12

TDB models of MG24TB5_A12 (1): PHASE and CONSTITUENT statements as written

MgTb-06Guo.tdb: MG24TB5_A12, type code %, sha256 69acc44761df0f6c…

51: PHASE MG24TB5_A12 % 2 24 5 !
52: CONST MG24TB5_A12 : MG : TB : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase; reports values for this phase

MG2TB_C14 (Mg–Tb)

Id: phase:mg-tb:mg2tb-c14; status assigned
Structure: MgZn2 · C14 · hP12 · P6_3/mmc (194); type st:c14-mgzn2-hp12; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–992.86 K, x(Tb) 0.32045–0.33333
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-tb:mg2tb-c14
paper: paper:10.1016/j.jallcom.2005.11.060:Mg2Tb
tdb: tdb:MgTb-06Guo.tdb:MG2TB_C14

TDB models of MG2TB_C14 (1): PHASE and CONSTITUENT statements as written

MgTb-06Guo.tdb: MG2TB_C14, type code %, sha256 69acc44761df0f6c…

61: PHASE MG2TB_C14 % 2 2 1 !
62: CONST MG2TB_C14 : MG : MG TB% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase; reports values for this phase

MG5M (Mg–Tb)

Id: phase:mg-tb:mg5m; status assigned
Structure: Cd45Sm11 · cF448 · F-43m (216); type st:cd45sm11-cf448; tier C: assessor-stated (Hallstedt 2025 crystallographic table); confidence assessor-stated
Structure source: B. Hallstedt, The SGTE collection of binary datasets, Calphad 89 (2025) 102833, supplementary crystallographic table (mmc2) doi:10.1016/j.calphad.2025.102833
Caveat: not certain from the name or DFT alone (name_has_descriptive_tokens:MG5M, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Mg 0.8333, Tb 0.1667
Stability: stable in 1 of 1 calculated diagram(s): 300–817.81 K, x(Tb) 0.16667–0.16667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:mg-tb:mg5m
paper: paper:10.1016/j.jallcom.2005.11.060:Mg5Tb
tdb: tdb:MgTb-06Guo.tdb:MG5M

TDB models of MG5M (1): PHASE and CONSTITUENT statements as written

MgTb-06Guo.tdb: MG5M, type code %, sha256 69acc44761df0f6c…

45: PHASE MG5M % 2 5 1 !
46: CONST MG5M : MG : TB : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2005.11.060 Cuiping Guo, Zhenmin Du, Thermodynamic optimization of the Mg–Tb and Mg–Yb systems, Journal of Alloys and Compounds 422, 102-108 (2006).
assessment that models this phase; reports 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). 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}
}