Er–Ge phases

16 phases (tier A 6, tier B 1, tier C 5, liquid 1, needs_review 3); 14 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 · Er–Ge system page · Markdown · field reference

Phases of the Er–Ge system (16)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:er-ge:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1211.4 K, x(Ge) 1–1	4	1
BCC_A2 phase:er-ge:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
ER11GE10 phase:er-ge:er11ge10	Ge10Ho11 · tI84 · I4/mmm (139)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1978.86 K, x(Ge) 0.47619–0.47619	15	1
ER2GE3_LT phase:er-ge:er2ge3	Er2Ge3 · mC6 · C2/m (12)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1239 K, x(Ge) 0.6–0.6	3	1
ER2GE3_C32 phase:er-ge:er2ge3-c32		needs_review	stable in 1 of 1 calculated diagram(s): 1239–1676.46 K, x(Ge) 0.6–0.6	12	1
ER2GE5 phase:er-ge:er2ge5	DyGe3 · oC16 · Cmcm (63)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1153.27 K, x(Ge) 0.71429–0.71429	16	1
ER3GE4 phase:er-ge:er3ge4	Er3Ge4 · oC28 · Cmcm (63)	tier B: DFT-supported (unique MP + OQMD match)	stable in 1 of 1 calculated diagram(s): 300–1535.75 K, x(Ge) 0.57143–0.57143	11	1
ER5GE3_D88 phase:er-ge:er5ge3-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2224.69 K, x(Ge) 0.375–0.39509	21	1
ER5GE4 phase:er-ge:er5ge4	Ge4Sm5 · oP36 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2153.29 K, x(Ge) 0.44444–0.44444	14	1
ERGE_B33 phase:er-ge:erge-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1739.39 K, x(Ge) 0.5–0.5	15	1
ERGE2_HT phase:er-ge:erge2-ht		needs_review	stable in 1 of 1 calculated diagram(s): 1234.45–1313.59 K, x(Ge) 0.66667–0.66667	9	1
ERGE2_LT phase:er-ge:erge2-lt	DyGe2 · oC24 · Cmc2_1 (36)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1179.78 K, x(Ge) 0.66667–0.66667	6	1
ERGE2_MT phase:er-ge:erge2-mt		needs_review	stable in 1 of 1 calculated diagram(s): 1179.78–1234.45 K, x(Ge) 0.66667–0.66667	6	1
FCC_A1 phase:er-ge: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:er-ge:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1807 K, x(Ge) 0–0	7	1
LIQUID phase:er-ge:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1139.25–2500 K, x(Ge) 0–1	34	1

DIAMOND_A4 (Er–Ge)

Id: phase:er-ge:a4-diamond; status assigned
Structure: C (diamond) · A4 · cF8 · Fd-3m (227); type st:a4-c-diamond-cf8; tier A: standard phase name; confidence high
Stoichiometry: Ge 1.0000
Stability: stable in 1 of 1 calculated diagram(s): 300–1211.4 K, x(Ge) 1–1
Literature: 4 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:er-ge:a4-diamond, corpus:phase:er-ge:diamond-a4
paper: paper:10.1016/j.jallcom.2017.07.129:Ge
tdb: tdb:ErGe-17Ach.tdb:DIAMOND_A4

TDB models of DIAMOND_A4 (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: DIAMOND_A4, type code %, sha256 734d825c539b2116…

46: PHASE DIAMOND_A4 % 1 1 !
47: CONST DIAMOND_A4 : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

BCC_A2 (Er–Ge)

Id: phase:er-ge: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: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:er-ge:bcc-a2
tdb: tdb:ErGe-17Ach.tdb:BCC_A2

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

ErGe-17Ach.tdb: BCC_A2, type code %B, sha256 734d825c539b2116…

36: PHASE BCC_A2 %B 2 1 3 !
37: CONST BCC_A2 : ER GE : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase

ER11GE10 (Er–Ge)

Id: phase:er-ge:er11ge10; status assigned
Structure: Ge10Ho11 · tI84 · I4/mmm (139); type st:ge10ho11-ti84; 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: Er 0.5238, Ge 0.4762
Stability: stable in 1 of 1 calculated diagram(s): 300–1978.86 K, x(Ge) 0.47619–0.47619
Literature: 15 values (15 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-ge:er11ge10
paper: paper:10.1016/j.jallcom.2017.07.129:Er11Ge10
tdb: tdb:ErGe-17Ach.tdb:ER11GE10

TDB models of ER11GE10 (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ER11GE10, type code %, sha256 734d825c539b2116…

61: PHASE ER11GE10 % 2 11 10 !
62: CONST ER11GE10 : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ER2GE3_LT (Er–Ge)

Id: phase:er-ge:er2ge3; status assigned
Structure: Er2Ge3 · mC6 · C2/m (12); type st:er2ge3-mc6; 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: Er 0.4000, Ge 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 300–1239 K, x(Ge) 0.6–0.6
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:er-ge:er2ge3, corpus:phase:er-ge:er2ge3-lt
paper: paper:10.1016/j.jallcom.2017.07.129:LT_Er2Ge3
tdb: tdb:ErGe-17Ach.tdb:ER2GE3_LT

TDB models of ER2GE3_LT (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ER2GE3_LT, type code %, sha256 734d825c539b2116…

76: PHASE ER2GE3_LT % 2 2 3 !
77: CONST ER2GE3_LT : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ER2GE3_C32 (Er–Ge)

Id: phase:er-ge:er2ge3-c32; status needs_review
No structure assigned. Why: assessment_declared_blocked_by:stoichiometry_contradicts_C32; stoichiometry_contradicts_C32:ErGe-17Ach.tdb
Candidate (literature_printed): AlB2 · hP3 — printed with a label mapped to this phase
Candidate (name_token): AlB2 · C32 · hP3 · P6/mmm (191) — Strukturbericht/word 'C32' in the TDB name
Candidate (sgte_mmc2): AlB2 · C32 · hP3 · P6/mmm (191) — Hallstedt 2025 mmc2 row for ER2GE3_C32: Er2Ge3 (high T)
Candidate (tdb_comment): AlB2 · hP3 · P6/mmm — ErGe-17Ach.tdb: 'Prototype AlB2 (hP3, P6/mmm)'
Stoichiometry: Er 0.4000, Ge 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 1239–1676.46 K, x(Ge) 0.6–0.6
Literature: 12 values (12 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-ge:er2ge3-c32
paper: paper:10.1016/j.jallcom.2017.07.129:HT_Er2Ge3
tdb: tdb:ErGe-17Ach.tdb:ER2GE3_C32

TDB models of ER2GE3_C32 (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ER2GE3_C32, type code %, sha256 734d825c539b2116…

81: PHASE ER2GE3_C32 % 2 2 3 !
82: CONST ER2GE3_C32 : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ER2GE5 (Er–Ge)

Id: phase:er-ge:er2ge5; status assigned
Structure: DyGe3 · oC16 · Cmcm (63); type st:dyge3-oc16; 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: Er 0.2857, Ge 0.7143
Stability: stable in 1 of 1 calculated diagram(s): 300–1153.27 K, x(Ge) 0.71429–0.71429
Literature: 16 values (16 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-ge:er2ge5
paper: paper:10.1016/j.jallcom.2017.07.129:Er2Ge5
tdb: tdb:ErGe-17Ach.tdb:ER2GE5

TDB models of ER2GE5 (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ER2GE5, type code %, sha256 734d825c539b2116…

101: PHASE ER2GE5 % 2 2 5 !
102: CONST ER2GE5 : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ER3GE4 (Er–Ge)

Id: phase:er-ge:er3ge4; status assigned
Structure: Er3Ge4 · oC28 · Cmcm (63); type st:er3ge4-oc28; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Er 0.4286, Ge 0.5714
Stability: stable in 1 of 1 calculated diagram(s): 300–1535.75 K, x(Ge) 0.57143–0.57143
Literature: 11 values (11 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:er-ge:er3ge4
mp: mp:mp-aaaaacnv
oqmd: oqmd:oqmd-14536
paper: paper:10.1016/j.jallcom.2017.07.129:Er3Ge4
tdb: tdb:ErGe-17Ach.tdb:ER3GE4

TDB models of ER3GE4 (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ER3GE4, type code %, sha256 734d825c539b2116…

71: PHASE ER3GE4 % 2 3 4 !
72: CONST ER3GE4 : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ER5GE3_D88 (Er–Ge)

Id: phase:er-ge:er5ge3-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): 300–2224.69 K, x(Ge) 0.375–0.39509
Literature: 21 values (21 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-ge:er5ge3-d88
paper: paper:10.1016/j.jallcom.2017.07.129:Er5Ge3
tdb: tdb:ErGe-17Ach.tdb:ER5GE3_D88

TDB models of ER5GE3_D88 (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ER5GE3_D88, type code %, sha256 734d825c539b2116…

51: PHASE ER5GE3_D88 % 2 5 3 !
52: CONST ER5GE3_D88 : ER% GE : GE : !

Example references (5 of 5; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase
doi:10.1051/jcp/1997940928 SV Meschel, OJ Klepp, Recent thermochemical studies of the binary alloys of Er with group IVB elements by high temperature direct synthesis calorimetry, J. Chim. Phys. 94, 928-938 (1997).
cited as the source of values for this phase

ER5GE4 (Er–Ge)

Id: phase:er-ge:er5ge4; status assigned
Structure: Ge4Sm5 · oP36 · Pnma (62); type st:ge4sm5-op36; 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_oqmd, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Er 0.5556, Ge 0.4444
Stability: stable in 1 of 1 calculated diagram(s): 300–2153.29 K, x(Ge) 0.44444–0.44444
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-ge:er5ge4
paper: paper:10.1016/j.jallcom.2017.07.129:Er5Ge4
tdb: tdb:ErGe-17Ach.tdb:ER5GE4

TDB models of ER5GE4 (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ER5GE4, type code %, sha256 734d825c539b2116…

56: PHASE ER5GE4 % 2 5 4 !
57: CONST ER5GE4 : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ERGE_B33 (Er–Ge)

Id: phase:er-ge:erge-b33; status assigned
Structure: CrB · B33 · oC8 · Cmcm (63); type st:b33-crb-oc8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaadjc and oqmd-7744, space group 63
Stoichiometry: Er 0.5000, Ge 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1739.39 K, x(Ge) 0.5–0.5
Literature: 15 values (15 accepted) from 1 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:er-ge:erge-b33
mp: mp:mp-aaaaadjc
oqmd: oqmd:oqmd-7744
paper: paper:10.1016/j.jallcom.2017.07.129:Er Ge, paper:10.1016/j.jallcom.2017.07.129:ErGe
tdb: tdb:ErGe-17Ach.tdb:ERGE_B33

TDB models of ERGE_B33 (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ERGE_B33, type code %, sha256 734d825c539b2116…

66: PHASE ERGE_B33 % 2 1 1 !
67: CONST ERGE_B33 : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ERGE2_HT (Er–Ge)

Id: phase:er-ge:erge2-ht; status needs_review
No structure assigned. Why: no_structure_token; polymorph_family:other phases of this system have the same composition; sgte_mmc2_row_incomplete
Candidate (literature_printed): ErGe2-ht · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): ErGe2-ht — Hallstedt 2025 mmc2 row for ERGE2_HT: ErGe2 (high T)
Stoichiometry: Er 0.3333, Ge 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 1234.45–1313.59 K, x(Ge) 0.66667–0.66667
Literature: 9 values (9 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:er-ge:erge2-ht
paper: paper:10.1016/j.jallcom.2017.07.129:Er Ge2, paper:10.1016/j.jallcom.2017.07.129:HT_ErGe2
tdb: tdb:ErGe-17Ach.tdb:ERGE2_HT

TDB models of ERGE2_HT (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ERGE2_HT, type code %, sha256 734d825c539b2116…

96: PHASE ERGE2_HT % 2 1 2 !
97: CONST ERGE2_HT : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ERGE2_LT (Er–Ge)

Id: phase:er-ge:erge2-lt; status assigned
Structure: DyGe2 · oC24 · Cmc2_1 (36); type st:dyge2-oc24; 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: Er 0.3333, Ge 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1179.78 K, x(Ge) 0.66667–0.66667
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-ge:erge2-lt
paper: paper:10.1016/j.jallcom.2017.07.129:LT_ErGe2
tdb: tdb:ErGe-17Ach.tdb:ERGE2_LT

TDB models of ERGE2_LT (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ERGE2_LT, type code %, sha256 734d825c539b2116…

86: PHASE ERGE2_LT % 2 1 2 !
87: CONST ERGE2_LT : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

ERGE2_MT (Er–Ge)

Id: phase:er-ge:erge2-mt; status needs_review
No structure assigned. Why: name_has_descriptive_tokens:MT; no_structure_token; sgte_mmc2_row_incomplete
Candidate (literature_printed): ErGe2-mt · ? — printed with a label mapped to this phase
Candidate (sgte_mmc2): ErGe2-mt — Hallstedt 2025 mmc2 row for ERGE2_MT: ErGe2 (medium T)
Stoichiometry: Er 0.3333, Ge 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 1179.78–1234.45 K, x(Ge) 0.66667–0.66667
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-ge:erge2-mt
paper: paper:10.1016/j.jallcom.2017.07.129:MT_ErGe2
tdb: tdb:ErGe-17Ach.tdb:ERGE2_MT

TDB models of ERGE2_MT (1): PHASE and CONSTITUENT statements as written

ErGe-17Ach.tdb: ERGE2_MT, type code %, sha256 734d825c539b2116…

91: PHASE ERGE2_MT % 2 1 2 !
92: CONST ERGE2_MT : ER : GE : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

FCC_A1 (Er–Ge)

Id: phase:er-ge: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:er-ge:fcc-a1
tdb: tdb:ErGe-17Ach.tdb:FCC_A1

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

ErGe-17Ach.tdb: FCC_A1, type code %A, sha256 734d825c539b2116…

31: PHASE FCC_A1 %A 2 1 1 !
32: CONST FCC_A1 : ER GE : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase

HCP_A3 (Er–Ge)

Id: phase:er-ge: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): 300–1807 K, x(Ge) 0–0
Literature: 7 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:er-ge:hcp-a3
paper: paper:10.1016/j.jallcom.2017.07.129:Er
tdb: tdb:ErGe-17Ach.tdb:HCP_A3

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

ErGe-17Ach.tdb: HCP_A3, type code %, sha256 734d825c539b2116…

41: PHASE HCP_A3 % 2 1 0.5 !
42: CONST HCP_A3 : ER% GE : VA : !

Example references (4 of 4; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase

LIQUID (Er–Ge)

Id: phase:er-ge:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1139.25–2500 K, x(Ge) 0–1
Literature: 34 values (32 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:er-ge:liquid
paper: paper:10.1016/j.jallcom.2017.07.129:L, paper:10.1016/j.jallcom.2017.07.129:liquid
tdb: tdb:ErGe-17Ach.tdb:LIQUID

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

ErGe-17Ach.tdb: LIQUID, type code %, sha256 734d825c539b2116…

26: PHASE LIQUID:L % 1 1 !
27: CONST LIQUID:L : ER GE : !

Example references (5 of 5; assessments first):

doi:10.1016/j.jallcom.2017.07.129 Khadija Achgar, Saïd Kardellass, Najim Selhaoui, Lahcen Bouirden, Thermodynamic optimization of the Erbium-Germanium binary system, Journal of Alloys and Compounds 724, 1157-1166 (2017).
assessment that models this phase; reports values for this phase
doi:10.1016/j.calphad.2007.10.002 G. Kaptay, Calphad 32e2 (2008) 338e352.
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:10.1021/ie50458a036 Otto Redlich, A. T. Kister, Algebraic Representation of Thermodynamic Properties and the Classification of Solutions, Ind. Eng. Chem. 40, 345-348 (1948).
cited as the source of values for this phase
doi:10.1143/jjap.45.2925 Yoshinori Tsuchiya, Masato Koyama, Junji Koga, Akira Nishiyama, Material Characterization of Metal Germanide Gate Electrodes Formed by Fully Germanided Gate Process, jjap 45, 2925 (2006).
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}
}