Gd–Tl phases

9 phases (tier A 7, tier C 1, liquid 1); 8 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 · Gd–Tl system page · Markdown · field reference

Phases of the Gd–Tl system (9)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:gd-tl:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1143.02–1588.13 K, x(Tl) 0–0.13927	16	2
B2_BCC phase:gd-tl:bcc-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2499.5 K, x(Tl) 0–1	12	1
FCC_A1 phase:gd-tl:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
GD2TL_B82 phase:gd-tl:gd2tl-b82	InNi2 · B8_2 · hP6 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1327.69 K, x(Tl) 0.33333–0.33333	12	1
GD3TL5 phase:gd-tl:gd3tl5	Pd5Pu3 · oC32 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1322.75 K, x(Tl) 0.625–0.625	9	1
GD5TL3_D88 phase:gd-tl:gd5tl3-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1492.69 K, x(Tl) 0.375–0.39564	12	1
GDTL3_L12 phase:gd-tl:gdtl3-l12	AuCu3 · L1_2 · cP4 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1263.11 K, x(Tl) 0.75–0.75	9	1
HCP_A3 phase:gd-tl:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1518.02 K, x(Tl) 0–1	8	1
LIQUID phase:gd-tl:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 576.23–2500 K, x(Tl) 0–1	36	1

BCC_A2 (Gd–Tl)

Id: phase:gd-tl: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): 1143.02–1588.13 K, x(Tl) 0–0.13927
Literature: 16 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:gd-tl:bcc-a2
paper: paper:10.1016/j.jallcom.2009.11.101:bcc
tdb: tdb:GdTl-10Guo.tdb:A2_BCC, tdb:GdTl-10Guo.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

GdTl-10Guo.tdb: A2_BCC, type code %B, sha256 81d605effa4ab98f…

40: PHASE A2_BCC %B 2 1 3 !
41: CONST A2_BCC : GD TL : VA : !

GdTl-10Guo.tdb: BCC_A2, type code %B, sha256 81d605effa4ab98f…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : GD% TL% : VA : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(88)90428-6 A. Saccone, S. Delfino, G. Cacciamani, R. Ferro, The binary phase diagrams of thallium with gadolinium, terbium and dysprosium, Journal of the Less Common Metals 136, 249-259 (1988).
cited as the source of values for this phase
doi:10.1515/ijmr-1983-741007 S. Delﬁno, A. Saccone, R. Ferro, Z. Metallkd. 74 (1983) 674.
cited as the source of values for this phase
doi:10.1016/j.calphad.2004.08.005 G. Kaptay, Calphad 28 (2004) 115.
cited as the source of values for this phase

B2_BCC (Gd–Tl)

Id: phase:gd-tl:bcc-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: GdTl-10Guo.tdb: ordered phase with disordered part A2_BCC (order/disorder model)
Caveat: partitioned order/disorder model in GdTl-10Guo.tdb also describes the disordered state
Stability: stable in 1 of 1 calculated diagram(s): 300–2499.5 K, x(Tl) 0–1
Literature: 12 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:gd-tl:bcc-b2, corpus:phase:gd-tl:b2-bcc
paper: paper:10.1016/j.jallcom.2009.11.101:GdTl
tdb: tdb:GdTl-10Guo.tdb:B2_BCC

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

GdTl-10Guo.tdb: B2_BCC, type code %BO, sha256 81d605effa4ab98f…

45: PHASE B2_BCC %BO 3 0.5 0.5 3 !
46: CONST B2_BCC : GD% TL : GD TL% : VA : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(88)90428-6 A. Saccone, S. Delfino, G. Cacciamani, R. Ferro, The binary phase diagrams of thallium with gadolinium, terbium and dysprosium, Journal of the Less Common Metals 136, 249-259 (1988).
cited as the source of values for this phase
doi:10.1016/j.calphad.2004.08.005 G. Kaptay, Calphad 28 (2004) 115.
cited as the source of values for this phase
doi:10.1515/ijmr-1983-741007 S. Delﬁno, A. Saccone, R. Ferro, Z. Metallkd. 74 (1983) 674.
cited as the source of values for this phase

FCC_A1 (Gd–Tl)

Id: phase:gd-tl:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
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:gd-tl:fcc-a1
tdb: tdb:GdTl-10Guo.tdb:FCC_A1

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

GdTl-10Guo.tdb: FCC_A1, type code %A, sha256 81d605effa4ab98f…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : GD TL : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase

GD2TL_B82 (Gd–Tl)

Id: phase:gd-tl:gd2tl-b82; status assigned
Structure: InNi2 · B8_2 · hP6 · P6_3/mmc (194); type st:b8-2-inni2-hp6; tier A: standard phase name; confidence high
Stoichiometry: Gd 0.6667, Tl 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1327.69 K, x(Tl) 0.33333–0.33333
Literature: 12 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:gd-tl:gd2tl-b82
paper: paper:10.1016/j.jallcom.2009.11.101:Gd2Tl
tdb: tdb:GdTl-10Guo.tdb:GD2TL_B82

TDB models of GD2TL_B82 (1): PHASE and CONSTITUENT statements as written

GdTl-10Guo.tdb: GD2TL_B82, type code %, sha256 81d605effa4ab98f…

55: PHASE GD2TL_B82 % 2 2 1 !
56: CONST GD2TL_B82 : GD : TL : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(88)90428-6 A. Saccone, S. Delfino, G. Cacciamani, R. Ferro, The binary phase diagrams of thallium with gadolinium, terbium and dysprosium, Journal of the Less Common Metals 136, 249-259 (1988).
cited as the source of values for this phase
doi:10.1016/j.calphad.2004.08.005 G. Kaptay, Calphad 28 (2004) 115.
cited as the source of values for this phase
doi:10.1515/ijmr-1983-741007 S. Delﬁno, A. Saccone, R. Ferro, Z. Metallkd. 74 (1983) 674.
cited as the source of values for this phase

GD3TL5 (Gd–Tl)

Id: phase:gd-tl:gd3tl5; status assigned
Structure: Pd5Pu3 · oC32 · Cmcm (63); type st:pd5pu3-oc32; 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_mp, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Gd 0.3750, Tl 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–1322.75 K, x(Tl) 0.625–0.625
Literature: 9 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:gd-tl:gd3tl5
paper: paper:10.1016/j.jallcom.2009.11.101:Gd3Tl5
tdb: tdb:GdTl-10Guo.tdb:GD3TL5

TDB models of GD3TL5 (1): PHASE and CONSTITUENT statements as written

GdTl-10Guo.tdb: GD3TL5, type code %, sha256 81d605effa4ab98f…

65: PHASE GD3TL5 % 2 3 5 !
66: CONST GD3TL5 : GD : TL : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(88)90428-6 A. Saccone, S. Delfino, G. Cacciamani, R. Ferro, The binary phase diagrams of thallium with gadolinium, terbium and dysprosium, Journal of the Less Common Metals 136, 249-259 (1988).
cited as the source of values for this phase
doi:10.1016/j.calphad.2004.08.005 G. Kaptay, Calphad 28 (2004) 115.
cited as the source of values for this phase
doi:10.1515/ijmr-1983-741007 S. Delﬁno, A. Saccone, R. Ferro, Z. Metallkd. 74 (1983) 674.
cited as the source of values for this phase

GD5TL3_D88 (Gd–Tl)

Id: phase:gd-tl:gd5tl3-d88; status assigned
Structure: Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193); type st:d8-8-mn5si3-hp16; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1492.69 K, x(Tl) 0.375–0.39564
Literature: 12 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:gd-tl:gd5tl3-d88
paper: paper:10.1016/j.jallcom.2009.11.101:Gd5Tl3
tdb: tdb:GdTl-10Guo.tdb:GD5TL3_D88

TDB models of GD5TL3_D88 (1): PHASE and CONSTITUENT statements as written

GdTl-10Guo.tdb: GD5TL3_D88, type code %, sha256 81d605effa4ab98f…

60: PHASE GD5TL3_D88 % 2 5 3 !
61: CONST GD5TL3_D88 : GD% TL : TL : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(88)90428-6 A. Saccone, S. Delfino, G. Cacciamani, R. Ferro, The binary phase diagrams of thallium with gadolinium, terbium and dysprosium, Journal of the Less Common Metals 136, 249-259 (1988).
cited as the source of values for this phase
doi:10.1016/j.calphad.2004.08.005 G. Kaptay, Calphad 28 (2004) 115.
cited as the source of values for this phase
doi:10.1515/ijmr-1983-741007 S. Delﬁno, A. Saccone, R. Ferro, Z. Metallkd. 74 (1983) 674.
cited as the source of values for this phase

GDTL3_L12 (Gd–Tl)

Id: phase:gd-tl:gdtl3-l12; status assigned
Structure: AuCu3 · L1_2 · cP4 · Pm-3m (221); type st:l1-2-aucu3-cp4; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaabeip and oqmd-30424, space group 221
Stoichiometry: Gd 0.2500, Tl 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1263.11 K, x(Tl) 0.75–0.75
Literature: 9 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:gd-tl:gdtl3-l12
mp: mp:mp-aaaabeip
oqmd: oqmd:oqmd-30424
paper: paper:10.1016/j.jallcom.2009.11.101:GdTl3
tdb: tdb:GdTl-10Guo.tdb:GDTL3_L12

TDB models of GDTL3_L12 (1): PHASE and CONSTITUENT statements as written

GdTl-10Guo.tdb: GDTL3_L12, type code %, sha256 81d605effa4ab98f…

70: PHASE GDTL3_L12 % 2 1 3 !
71: CONST GDTL3_L12 : GD : TL : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(88)90428-6 A. Saccone, S. Delfino, G. Cacciamani, R. Ferro, The binary phase diagrams of thallium with gadolinium, terbium and dysprosium, Journal of the Less Common Metals 136, 249-259 (1988).
cited as the source of values for this phase
doi:10.1016/j.calphad.2004.08.005 G. Kaptay, Calphad 28 (2004) 115.
cited as the source of values for this phase
doi:10.1515/ijmr-1983-741007 S. Delﬁno, A. Saccone, R. Ferro, Z. Metallkd. 74 (1983) 674.
cited as the source of values for this phase

HCP_A3 (Gd–Tl)

Id: phase:gd-tl: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): 300–1518.02 K, x(Tl) 0–1
Literature: 8 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:gd-tl:hcp-a3
paper: paper:10.1016/j.jallcom.2009.11.101:hcp
tdb: tdb:GdTl-10Guo.tdb:HCP_A3

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

GdTl-10Guo.tdb: HCP_A3, type code %A, sha256 81d605effa4ab98f…

50: PHASE HCP_A3 %A 2 1 0.5 !
51: CONST HCP_A3 : GD% TL% : VA : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(88)90428-6 A. Saccone, S. Delfino, G. Cacciamani, R. Ferro, The binary phase diagrams of thallium with gadolinium, terbium and dysprosium, Journal of the Less Common Metals 136, 249-259 (1988).
cited as the source of values for this phase
doi:10.1515/ijmr-1983-741007 S. Delﬁno, A. Saccone, R. Ferro, Z. Metallkd. 74 (1983) 674.
cited as the source of values for this phase
doi:10.1016/j.calphad.2004.08.005 G. Kaptay, Calphad 28 (2004) 115.
cited as the source of values for this phase

LIQUID (Gd–Tl)

Id: phase:gd-tl:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 576.23–2500 K, x(Tl) 0–1
Literature: 36 values (27 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:gd-tl:liquid
paper: paper:10.1016/j.jallcom.2009.11.101:L
tdb: tdb:GdTl-10Guo.tdb:LIQUID

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

GdTl-10Guo.tdb: LIQUID, type code %, sha256 81d605effa4ab98f…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : GD TL : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2009.11.101 Cuiping Guo, Changrong Li, Zhenmin Du, A thermodynamic modeling of the Gd–Tl system, Journal of Alloys and Compounds 492, 122-127 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/0022-5088(88)90428-6 A. Saccone, S. Delfino, G. Cacciamani, R. Ferro, The binary phase diagrams of thallium with gadolinium, terbium and dysprosium, Journal of the Less Common Metals 136, 249-259 (1988).
cited as the source of values for this phase
doi:10.1016/j.calphad.2004.08.005 G. Kaptay, Calphad 28 (2004) 115.
cited as the source of values for this phase
doi:10.1515/ijmr-1983-741007 S. Delﬁno, A. Saccone, R. Ferro, Z. Metallkd. 74 (1983) 674.
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). 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}
}