Fe–Gd phases

11 phases (tier A 5, tier C 3, liquid 1, needs_review 2); 11 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 · Fe–Gd system page · Markdown · field reference

Phases of the Fe–Gd system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:fe-gd:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–2499.85 K, x(Gd) 0–1	36	6
FCC_A1 phase:fe-gd:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 1159.86–1667.47 K, x(Gd) 0–0.01105	30	6
FE17GD2 phase:fe-gd:fe17gd2		needs_review	stable in 2 of 2 calculated diagram(s): 300–1603.94 K, x(Gd) 0.10526–0.10526	10	2
FE17GD2_HT phase:fe-gd:fe17gd2-ht	Ni17Th2 · hP38 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 4 of 4 calculated diagram(s): 1482.48–1608.6 K, x(Gd) 0.10526–0.10526	18	4
FE17GD2_LT phase:fe-gd:fe17gd2-lt	Th2Zn17 · hR19 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 4 of 4 calculated diagram(s): 300–1488.35 K, x(Gd) 0.10526–0.10526	6	4
FE23GD6 phase:fe-gd:fe23gd6		needs_review	stable in 1 of 1 calculated diagram(s): 300–1551.48 K, x(Gd) 0.2069–0.2069	11	1
FE23GD6_D8A phase:fe-gd:fe23gd6-d8a	Mn23Th6 · D8_a · cF116 · Fm-3m (225)	tier A: standard phase name	stable in 5 of 5 calculated diagram(s): 300–1556.2 K, x(Gd) 0.2069–0.2069	9	5
FE2GD_C15 phase:fe-gd:fe2gd-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–1470.3 K, x(Gd) 0.33333–0.33333	27	6
FE3GD phase:fe-gd:fe3gd	Ni3Pu · hR12 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 6 of 6 calculated diagram(s): 300–1433.33 K, x(Gd) 0.25–0.25	30	6
HCP_A3 phase:fe-gd:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 6 of 6 calculated diagram(s): 300–1583 K, x(Gd) 0.99025–1	17	6
LIQUID phase:fe-gd:liquid	liquid	liquid	stable in 6 of 6 calculated diagram(s): 1087.34–2500 K, x(Gd) 0–1	79	6

BCC_A2 (Fe–Gd)

Id: phase:fe-gd: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 6 of 6 calculated diagram(s): 300–2499.85 K, x(Gd) 0–1
Literature: 36 values (36 accepted) from 3 papers
Interactive: phase registry entry

Names (14): corpus: corpus:phase:fe-gd:bcc-a2
paper: paper:10.1016/0925-8388(95)01578-7:b.c.c., paper:10.1034/j.1600-0692.2002.311310106.x:αFe, paper:10.1034/j.1600-0692.2002.311310106.x:βGd, paper:10.1034/j.1600-0692.2002.311310106.x:δFe, paper:10.1361/105497100770339923:αFe, paper:10.1361/105497100770339923:βGd, paper:10.1361/105497100770339923:δFe
tdb: tdb:FeGd-00Zin.tdb:BCC_A2, tdb:FeGd-02Zin-newGd.tdb:BCC_A2, tdb:FeGd-02Zin.tdb:BCC_A2, tdb:FeGd-12Wan.tdb:BCC_A2, tdb:FeGd-17Che.tdb:BCC_A2, tdb:FeGd-95Liu.tdb:BCC_A2

TDB models of BCC_A2 (6): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: BCC_A2, type code %B, sha256 c29d3c3fbef2ea49…

42: PHASE BCC_A2 %B 2 1 3 !
43: CONST BCC_A2 : FE% GD% : VA : !

FeGd-02Zin-newGd.tdb: BCC_A2, type code %B, sha256 f16780fed3b16558…

49: PHASE BCC_A2 %B 2 1 3 !
50: CONST BCC_A2 : FE% GD% : VA : !

FeGd-02Zin.tdb: BCC_A2, type code %B, sha256 ccf919e5867bc088…

49: PHASE BCC_A2 %B 2 1 3 !
50: CONST BCC_A2 : FE% GD% : VA : !

FeGd-12Wan.tdb: BCC_A2, type code %B, sha256 f83f09ebff484a46…

44: PHASE BCC_A2 %B 2 1 3 !
45: CONST BCC_A2 : FE% GD% : VA : !

FeGd-17Che.tdb: BCC_A2, type code %B, sha256 6eae73757a5ee767…

45: PHASE BCC_A2 %B 2 1 3 !
46: CONST BCC_A2 : FE% GD% : VA : !

FeGd-95Liu.tdb: BCC_A2, type code %B, sha256 5d743908ff00aa1f…

44: PHASE BCC_A2 %B 2 1 3 !
45: CONST BCC_A2 : FE% GD% : VA : !

Example references (5 of 5; assessments first):

doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S1002-0721(12)60178-1 W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012).
assessment that models this phase

FCC_A1 (Fe–Gd)

Id: phase:fe-gd: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 6 of 6 calculated diagram(s): 1159.86–1667.47 K, x(Gd) 0–0.01105
Literature: 30 values (30 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:fe-gd:fcc-a1
paper: paper:10.1016/0925-8388(95)01578-7:f.c.c., paper:10.1034/j.1600-0692.2002.311310106.x:γFe, paper:10.1361/105497100770339923:γFe
tdb: tdb:FeGd-00Zin.tdb:FCC_A1, tdb:FeGd-02Zin-newGd.tdb:FCC_A1, tdb:FeGd-02Zin.tdb:FCC_A1, tdb:FeGd-12Wan.tdb:FCC_A1, tdb:FeGd-17Che.tdb:FCC_A1, tdb:FeGd-95Liu.tdb:FCC_A1

TDB models of FCC_A1 (6): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: FCC_A1, type code %A, sha256 c29d3c3fbef2ea49…

37: PHASE FCC_A1 %A 2 1 1 !
38: CONST FCC_A1 : FE% GD : VA : !

FeGd-02Zin-newGd.tdb: FCC_A1, type code %A, sha256 f16780fed3b16558…

44: PHASE FCC_A1 %A 2 1 1 !
45: CONST FCC_A1 : FE% GD : VA : !

FeGd-02Zin.tdb: FCC_A1, type code %A, sha256 ccf919e5867bc088…

44: PHASE FCC_A1 %A 2 1 1 !
45: CONST FCC_A1 : FE% GD : VA : !

FeGd-12Wan.tdb: FCC_A1, type code %A, sha256 f83f09ebff484a46…

39: PHASE FCC_A1 %A 2 1 1 !
40: CONST FCC_A1 : FE% GD : VA : !

FeGd-17Che.tdb: FCC_A1, type code %A, sha256 6eae73757a5ee767…

40: PHASE FCC_A1 %A 2 1 1 !
41: CONST FCC_A1 : FE% GD : VA : !

FeGd-95Liu.tdb: FCC_A1, type code %A, sha256 5d743908ff00aa1f…

39: PHASE FCC_A1 %A 2 1 1 !
40: CONST FCC_A1 : FE% GD : VA : !

Example references (5 of 5; assessments first):

doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S1002-0721(12)60178-1 W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012).
assessment that models this phase

FE17GD2 (Fe–Gd)

Id: phase:fe-gd:fe17gd2; status needs_review
No structure assigned. Why: no_structure_token; off_stoichiometric_model; sgte_mmc2_rows_disagree
Candidate (literature_printed): Ni17Th2 · hP38 — printed with a label mapped to this phase
Candidate (sgte_mmc2): Ni17Th2 · hP38 · P6_3/mmc (194) — Hallstedt 2025 mmc2 row for FE17GD2: Fe17Gd2 (high T), see also Th2Zn17
Candidate (sgte_mmc2): Th2Zn17 · hR19 · R-3m (166) — Hallstedt 2025 mmc2 row for FE17GD2: Fe17Gd2 (low T), see also Ni17Th2
Candidate (tdb_comment): Th2Zn17 · hR19 · R-3m — FeGd-12Wan.tdb: 'Prototype Th2Zn17 (hR19, R-3m); low T, Ni17Th2 (hP38, P6_3/mmc); high T'
Candidate (tdb_comment): Th2Zn17 · hR19 · R-3m — FeGd-95Liu.tdb: 'Prototype Th2Zn17 (hR19, R-3m); low T, Ni17Th2 (hP38, P6_3/mmc); high T'
Stability: stable in 2 of 2 calculated diagram(s): 300–1603.94 K, x(Gd) 0.10526–0.10526
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:fe-gd:fe17gd2
paper: paper:10.1016/0925-8388(95)01578-7:Fe17Gd2, paper:10.1361/105497100770339923:Fe17Gd2
tdb: tdb:FeGd-12Wan.tdb:FE17GD2, tdb:FeGd-95Liu.tdb:FE17GD2

TDB models of FE17GD2 (2): PHASE and CONSTITUENT statements as written

FeGd-12Wan.tdb: FE17GD2, type code %A, sha256 f83f09ebff484a46…

54: PHASE FE17GD2 %A 3 1 2 15 !
55: CONST FE17GD2 : FE2 GD : GD : FE : !

FeGd-95Liu.tdb: FE17GD2, type code %A, sha256 5d743908ff00aa1f…

54: PHASE FE17GD2 %A 2 17 2 !
55: CONST FE17GD2 : FE : GD : !

Example references (4 of 4; assessments first):

doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
assessment that models this phase; reports values for this phase
doi:10.1016/S1002-0721(12)60178-1 W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012).
assessment that models this phase
doi:10.1007/bf02646931 C. Colinet, A. Pasturel, K. H. J. Buschow, Study of the enthalpies of formation in the Gd-(Fe, Co, Pd, Pt) systems, Metall Trans A 18, 903-907 (1987).
cited as the source of values for this phase
doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
reports values for this phase

FE17GD2_HT (Fe–Gd)

Id: phase:fe-gd:fe17gd2-ht; status assigned
Structure: Ni17Th2 · hP38 · P6_3/mmc (194); type st:ni17th2-hp38; 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_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Fe 0.8947, Gd 0.1053
Stability: stable in 4 of 4 calculated diagram(s): 1482.48–1608.6 K, x(Gd) 0.10526–0.10526
Literature: 18 values (18 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:fe-gd:fe17gd2-ht
paper: paper:10.1034/j.1600-0692.2002.311310106.x:Fe17Gd2(H), paper:10.1361/105497100770339923:Fe17Gd2, paper:10.1361/105497100770339923:Fe17Gd2 (h)
tdb: tdb:FeGd-00Zin.tdb:FE17GD2_HT, tdb:FeGd-02Zin-newGd.tdb:FE17GD2_HT, tdb:FeGd-02Zin.tdb:FE17GD2_HT, tdb:FeGd-17Che.tdb:FE17GD2_HT

TDB models of FE17GD2_HT (4): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: FE17GD2_HT, type code %A, sha256 c29d3c3fbef2ea49…

57: PHASE FE17GD2_HT %A 2 17 2 !
58: CONST FE17GD2_HT : FE : GD : !

FeGd-02Zin-newGd.tdb: FE17GD2_HT, type code %, sha256 f16780fed3b16558…

64: PHASE FE17GD2_HT % 2 17 2 !
65: CONST FE17GD2_HT : FE : GD : !

FeGd-02Zin.tdb: FE17GD2_HT, type code %, sha256 ccf919e5867bc088…

64: PHASE FE17GD2_HT % 2 17 2 !
65: CONST FE17GD2_HT : FE : GD : !

FeGd-17Che.tdb: FE17GD2_HT, type code %, sha256 6eae73757a5ee767…

60: PHASE FE17GD2_HT % 2 17 2 !
61: CONST FE17GD2_HT : FE : GD : !

Example references (5 of 5; assessments first):

doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
cited as the source of values for this phase
doi:10.1179/mst.1990.6.8.778 S. Atiq, R. D. Rawlings, D. R. F. West, Crystal structure of compounds Fe17Gd2and Fe17Tb2, Materials Science and Technology 6, 778-780 (1990).
cited as the source of values for this phase

FE17GD2_LT (Fe–Gd)

Id: phase:fe-gd:fe17gd2-lt; status assigned
Structure: Th2Zn17 · hR19 · R-3m (166); type st:th2zn17-hr19; 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_structure_token, polymorph_family:other phases of this system have the same composition); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Fe 0.8947, Gd 0.1053
Stability: stable in 4 of 4 calculated diagram(s): 300–1488.35 K, x(Gd) 0.10526–0.10526
Literature: 6 values (6 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:fe-gd:fe17gd2-lt
paper: paper:10.1034/j.1600-0692.2002.311310106.x:Fe17Gd2(R), paper:10.1361/105497100770339923:Fe17Gd2 (r)
tdb: tdb:FeGd-00Zin.tdb:FE17GD2_LT, tdb:FeGd-02Zin-newGd.tdb:FE17GD2_LT, tdb:FeGd-02Zin.tdb:FE17GD2_LT, tdb:FeGd-17Che.tdb:FE17GD2_LT

TDB models of FE17GD2_LT (4): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: FE17GD2_LT, type code %A, sha256 c29d3c3fbef2ea49…

52: PHASE FE17GD2_LT %A 2 17 2 !
53: CONST FE17GD2_LT : FE : GD : !

FeGd-02Zin-newGd.tdb: FE17GD2_LT, type code %A, sha256 f16780fed3b16558…

59: PHASE FE17GD2_LT %A 2 17 2 !
60: CONST FE17GD2_LT : FE : GD : !

FeGd-02Zin.tdb: FE17GD2_LT, type code %A, sha256 ccf919e5867bc088…

59: PHASE FE17GD2_LT %A 2 17 2 !
60: CONST FE17GD2_LT : FE : GD : !

FeGd-17Che.tdb: FE17GD2_LT, type code %A, sha256 6eae73757a5ee767…

55: PHASE FE17GD2_LT %A 2 17 2 !
56: CONST FE17GD2_LT : FE : GD : !

Example references (5 of 5; assessments first):

doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
cited as the source of values for this phase
doi:10.1179/mst.1990.6.8.778 S. Atiq, R. D. Rawlings, D. R. F. West, Crystal structure of compounds Fe17Gd2and Fe17Tb2, Materials Science and Technology 6, 778-780 (1990).
cited as the source of values for this phase

FE23GD6 (Fe–Gd)

Id: phase:fe-gd:fe23gd6; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition
Candidate (tdb_comment): Mn23Th6 · cF116 · Fm-3m — FeGd-02Zin-newGd.tdb: 'Prototype Mn23Th6 (cF116, Fm-3m)'
Stoichiometry: Fe 0.7931, Gd 0.2069
Stability: stable in 1 of 1 calculated diagram(s): 300–1551.48 K, x(Gd) 0.2069–0.2069
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:fe-gd:fe23gd6
paper: paper:10.1034/j.1600-0692.2002.311310106.x:Fe23Gd6
tdb: tdb:FeGd-02Zin-newGd.tdb:FE23GD6

TDB models of FE23GD6 (1): PHASE and CONSTITUENT statements as written

FeGd-02Zin-newGd.tdb: FE23GD6, type code %A, sha256 f16780fed3b16558…

69: PHASE FE23GD6 %A 2 23 6 !
70: CONST FE23GD6 : FE : GD : !

Example references (2 of 2; assessments first):

doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
cited as the source of values for this phase

FE23GD6_D8A (Fe–Gd)

Id: phase:fe-gd:fe23gd6-d8a; status assigned
Structure: Mn23Th6 · D8_a · cF116 · Fm-3m (225); type st:d8-a-mn23th6-cf116; tier A: standard phase name; confidence high
Stoichiometry: Fe 0.7931, Gd 0.2069
Stability: stable in 5 of 5 calculated diagram(s): 300–1556.2 K, x(Gd) 0.2069–0.2069
Literature: 9 values (9 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:fe-gd:fe23gd6-d8a
paper: paper:10.1016/0925-8388(95)01578-7:Fe23Gd6, paper:10.1361/105497100770339923:Fe23Gd6
tdb: tdb:FeGd-00Zin.tdb:FE23GD6_D8A, tdb:FeGd-02Zin.tdb:FE23GD6_D8A, tdb:FeGd-12Wan.tdb:FE23GD6_D8A, tdb:FeGd-17Che.tdb:FE23GD6_D8A, tdb:FeGd-95Liu.tdb:FE23GD6_D8A

TDB models of FE23GD6_D8A (5): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: FE23GD6_D8A, type code %A, sha256 c29d3c3fbef2ea49…

62: PHASE FE23GD6_D8A %A 2 23 6 !
63: CONST FE23GD6_D8A : FE : GD : !

FeGd-02Zin.tdb: FE23GD6_D8A, type code %A, sha256 ccf919e5867bc088…

69: PHASE FE23GD6_D8A %A 2 23 6 !
70: CONST FE23GD6_D8A : FE : GD : !

FeGd-12Wan.tdb: FE23GD6_D8A, type code %A, sha256 f83f09ebff484a46…

59: PHASE FE23GD6_D8A %A 2 23 6 !
60: CONST FE23GD6_D8A : FE : GD : !

FeGd-17Che.tdb: FE23GD6_D8A, type code %A, sha256 6eae73757a5ee767…

65: PHASE FE23GD6_D8A %A 2 23 6 !
66: CONST FE23GD6_D8A : FE : GD : !

FeGd-95Liu.tdb: FE23GD6_D8A, type code %A, sha256 5d743908ff00aa1f…

59: PHASE FE23GD6_D8A %A 2 23 6 !
60: CONST FE23GD6_D8A : FE : GD : !

Example references (5 of 5; assessments first):

doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
assessment that models this phase; reports values for this phase
doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S1002-0721(12)60178-1 W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012).
assessment that models this phase
doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase

FE2GD_C15 (Fe–Gd)

Id: phase:fe-gd:fe2gd-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Stoichiometry: Fe 0.6667, Gd 0.3333
Stability: stable in 6 of 6 calculated diagram(s): 300–1470.3 K, x(Gd) 0.33333–0.33333
Literature: 27 values (27 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:fe-gd:fe2gd-c15
paper: paper:10.1016/0925-8388(95)01578-7:Fe2Gd, paper:10.1034/j.1600-0692.2002.311310106.x:Fe2Gd, paper:10.1361/105497100770339923:Fe2Gd
tdb: tdb:FeGd-00Zin.tdb:FE2GD_C15, tdb:FeGd-02Zin-newGd.tdb:FE2GD_C15, tdb:FeGd-02Zin.tdb:FE2GD_C15, tdb:FeGd-12Wan.tdb:FE2GD_C15, tdb:FeGd-17Che.tdb:FE2GD_C15, tdb:FeGd-95Liu.tdb:FE2GD_C15

TDB models of FE2GD_C15 (6): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: FE2GD_C15, type code %A, sha256 c29d3c3fbef2ea49…

72: PHASE FE2GD_C15 %A 2 2 1 !
73: CONST FE2GD_C15 : FE : GD : !

FeGd-02Zin-newGd.tdb: FE2GD_C15, type code %A, sha256 f16780fed3b16558…

79: PHASE FE2GD_C15 %A 2 2 1 !
80: CONST FE2GD_C15 : FE : GD : !

FeGd-02Zin.tdb: FE2GD_C15, type code %A, sha256 ccf919e5867bc088…

79: PHASE FE2GD_C15 %A 2 2 1 !
80: CONST FE2GD_C15 : FE : GD : !

FeGd-12Wan.tdb: FE2GD_C15, type code %A, sha256 f83f09ebff484a46…

69: PHASE FE2GD_C15 %A 2 2 1 !
70: CONST FE2GD_C15 : FE : GD : !

FeGd-17Che.tdb: FE2GD_C15, type code %A, sha256 6eae73757a5ee767…

75: PHASE FE2GD_C15 %A 2 2 1 !
76: CONST FE2GD_C15 : FE : GD : !

FeGd-95Liu.tdb: FE2GD_C15, type code %A, sha256 5d743908ff00aa1f…

69: PHASE FE2GD_C15 %A 2 2 1 !
70: CONST FE2GD_C15 : FE : GD : !

Example references (7 of 7; assessments first):

doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S1002-0721(12)60178-1 W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012).
assessment that models this phase
doi:10.1007/bf02646931 C. Colinet, A. Pasturel, K. H. J. Buschow, Study of the enthalpies of formation in the Gd-(Fe, Co, Pd, Pt) systems, Metall Trans A 18, 903-907 (1987).
cited as the source of values for this phase
doi:10.1016/0022-4596(81)90500-4 D.J. Germano, R.A. Butera, K.A. Gschneidner, Heat capacity and thermodynamic functions of theRFe2 compounds (R =Gd, Tb, Dy, Ho, Er, Tm, Lu) over the temperature region 8 to 300 K, Journal of Solid State Chemistry 37, 383-389 (1981).
cited as the source of values for this phase

FE3GD (Fe–Gd)

Id: phase:fe-gd:fe3gd; status assigned
Structure: Ni3Pu · hR12 · R-3m (166); type st:ni3pu-hr12; 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: Fe 0.7500, Gd 0.2500
Stability: stable in 6 of 6 calculated diagram(s): 300–1433.33 K, x(Gd) 0.25–0.25
Literature: 30 values (30 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:fe-gd:fe3gd
paper: paper:10.1016/0925-8388(95)01578-7:Fe3Gd, paper:10.1034/j.1600-0692.2002.311310106.x:Fe3Gd, paper:10.1361/105497100770339923:Fe3Gd
tdb: tdb:FeGd-00Zin.tdb:FE3GD, tdb:FeGd-02Zin-newGd.tdb:FE3GD, tdb:FeGd-02Zin.tdb:FE3GD, tdb:FeGd-12Wan.tdb:FE3GD, tdb:FeGd-17Che.tdb:FE3GD, tdb:FeGd-95Liu.tdb:FE3GD

TDB models of FE3GD (6): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: FE3GD, type code %A, sha256 c29d3c3fbef2ea49…

67: PHASE FE3GD %A 2 3 1 !
68: CONST FE3GD : FE : GD : !

FeGd-02Zin-newGd.tdb: FE3GD, type code %A, sha256 f16780fed3b16558…

74: PHASE FE3GD %A 2 3 1 !
75: CONST FE3GD : FE : GD : !

FeGd-02Zin.tdb: FE3GD, type code %A, sha256 ccf919e5867bc088…

74: PHASE FE3GD %A 2 3 1 !
75: CONST FE3GD : FE : GD : !

FeGd-12Wan.tdb: FE3GD, type code %A, sha256 f83f09ebff484a46…

64: PHASE FE3GD %A 2 3 1 !
65: CONST FE3GD : FE : GD : !

FeGd-17Che.tdb: FE3GD, type code %A, sha256 6eae73757a5ee767…

70: PHASE FE3GD %A 2 3 1 !
71: CONST FE3GD : FE : GD : !

FeGd-95Liu.tdb: FE3GD, type code %A, sha256 5d743908ff00aa1f…

64: PHASE FE3GD %A 2 3 1 !
65: CONST FE3GD : FE : GD : !

Example references (6 of 6; assessments first):

doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S1002-0721(12)60178-1 W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012).
assessment that models this phase
doi:10.1007/bf02646931 C. Colinet, A. Pasturel, K. H. J. Buschow, Study of the enthalpies of formation in the Gd-(Fe, Co, Pd, Pt) systems, Metall Trans A 18, 903-907 (1987).
cited as the source of values for this phase

HCP_A3 (Fe–Gd)

Id: phase:fe-gd: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 6 of 6 calculated diagram(s): 300–1583 K, x(Gd) 0.99025–1
Literature: 17 values (17 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:fe-gd:hcp-a3
paper: paper:10.1016/0925-8388(95)01578-7:h.c.p., paper:10.1034/j.1600-0692.2002.311310106.x:αGd, paper:10.1361/105497100770339923:αGd
tdb: tdb:FeGd-00Zin.tdb:HCP_A3, tdb:FeGd-02Zin-newGd.tdb:HCP_A3, tdb:FeGd-02Zin.tdb:HCP_A3, tdb:FeGd-12Wan.tdb:HCP_A3, tdb:FeGd-17Che.tdb:HCP_A3, tdb:FeGd-95Liu.tdb:HCP_A3

TDB models of HCP_A3 (6): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: HCP_A3, type code %A, sha256 c29d3c3fbef2ea49…

47: PHASE HCP_A3 %A 2 1 0.5 !
48: CONST HCP_A3 : FE GD% : VA : !

FeGd-02Zin-newGd.tdb: HCP_A3, type code %A, sha256 f16780fed3b16558…

54: PHASE HCP_A3 %A 2 1 0.5 !
55: CONST HCP_A3 : FE GD% : VA : !

FeGd-02Zin.tdb: HCP_A3, type code %A, sha256 ccf919e5867bc088…

54: PHASE HCP_A3 %A 2 1 0.5 !
55: CONST HCP_A3 : FE GD% : VA : !

FeGd-12Wan.tdb: HCP_A3, type code %A, sha256 f83f09ebff484a46…

49: PHASE HCP_A3 %A 2 1 0.5 !
50: CONST HCP_A3 : FE GD% : VA : !

FeGd-17Che.tdb: HCP_A3, type code %A, sha256 6eae73757a5ee767…

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

FeGd-95Liu.tdb: HCP_A3, type code %A, sha256 5d743908ff00aa1f…

49: PHASE HCP_A3 %A 2 1 0.5 !
50: CONST HCP_A3 : FE GD% : VA : !

Example references (5 of 5; assessments first):

doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S1002-0721(12)60178-1 W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012).
assessment that models this phase

LIQUID (Fe–Gd)

Id: phase:fe-gd:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 6 of 6 calculated diagram(s): 1087.34–2500 K, x(Gd) 0–1
Literature: 79 values (79 accepted) from 3 papers
Interactive: phase registry entry

Names (10): corpus: corpus:phase:fe-gd:liquid
paper: paper:10.1016/0925-8388(95)01578-7:L, paper:10.1034/j.1600-0692.2002.311310106.x:liquid, paper:10.1361/105497100770339923:Liquid
tdb: tdb:FeGd-00Zin.tdb:LIQUID, tdb:FeGd-02Zin-newGd.tdb:LIQUID, tdb:FeGd-02Zin.tdb:LIQUID, tdb:FeGd-12Wan.tdb:LIQUID, tdb:FeGd-17Che.tdb:LIQUID, tdb:FeGd-95Liu.tdb:LIQUID

TDB models of LIQUID (6): PHASE and CONSTITUENT statements as written

FeGd-00Zin.tdb: LIQUID, type code %, sha256 c29d3c3fbef2ea49…

32: PHASE LIQUID:L % 1 1 !
33: CONST LIQUID:L : FE GD : !

FeGd-02Zin-newGd.tdb: LIQUID, type code %, sha256 f16780fed3b16558…

39: PHASE LIQUID:L % 1 1 !
40: CONST LIQUID:L : FE GD : !

FeGd-02Zin.tdb: LIQUID, type code %, sha256 ccf919e5867bc088…

39: PHASE LIQUID:L % 1 1 !
40: CONST LIQUID:L : FE GD : !

FeGd-12Wan.tdb: LIQUID, type code %, sha256 f83f09ebff484a46…

34: PHASE LIQUID:L % 1 1 !
35: CONST LIQUID:L : FE GD : !

FeGd-17Che.tdb: LIQUID, type code %, sha256 6eae73757a5ee767…

35: PHASE LIQUID:L % 1 1 !
36: CONST LIQUID:L : FE GD : !

FeGd-95Liu.tdb: LIQUID, type code %, sha256 5d743908ff00aa1f…

34: PHASE LIQUID:L % 1 1 !
35: CONST LIQUID:L : FE GD : !

Example references (5 of 5; assessments first):

doi:10.1361/105497100770339923 M. Zinkevich, N. Mattern, H. J. Seifert, Reassessment of the Fe-Gd (Iron-Gadolinum) system, JPE 21, 385-394 (2000).
assessment that models this phase; reports values for this phase
doi:10.1016/0925-8388(95)01578-7 Zi-Kui Liu, Weijing Zhang, Bo Sundman, Thermodynamic assessment of the CoFeGd systems, Journal of Alloys and Compounds 226, 33-45 (1995).
assessment that models this phase; cited as the source of values for this phase; reports values for this phase
doi:10.1034/j.1600-0692.2002.311310106.x Matvei Zinkevich, Norbert Mattern, Hans‐Jürgen Seifert, Eberhard Gmelin, A thermodynamic assessment of the Fe‐Gd‐Mo system, Scand Jof Metallurgy 31, 34-51 (2002).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2017.07.005 X.L. Chen, J. Wang, T.L. Chen, X.D. Lin, M.H. Rong, G.H. Rao, H.Y. Zhou, Calphad, 58, 151-59(2017).
assessment that models this phase
doi:10.1016/S1002-0721(12)60178-1 W. Wang, C. Guo, C. Li, Z. Du, J. Rare Earths, 30, 1055-63(2012).
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}
}