Ge–Hf phases

11 phases (tier A 8, tier C 2, liquid 1); 10 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 · Ge–Hf system page · Markdown · field reference

Phases of the Ge–Hf system (11)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:ge-hf: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(Hf) 0–0	3	1
BCC_A2 phase:ge-hf:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 2015.94–3999.33 K, x(Hf) 0.99993–1	4	1
FCC_A1 phase:ge-hf:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
GE2HF_C49 phase:ge-hf:ge2hf-c49	ZrSi2 · C49 · oC12 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2022.59 K, x(Hf) 0.33333–0.33333	5	1
GE2HF3_D5A phase:ge-hf:ge2hf3-d5a	Si2U3 · D5_a · tP10 · P4/mbm (127)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1514.4–2433.25 K, x(Hf) 0.6–0.6	6	1
GE3HF5_D88 phase:ge-hf:ge3hf5-d88	Mn5Si3 · D8_8 · hP16 · P6_3/mcm (193)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2466.19 K, x(Hf) 0.625–0.625	8	1
GE4HF5 phase:ge-hf:ge4hf5	Ge4Sm5 · oP36 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2415.3 K, x(Hf) 0.55556–0.55556	6	1
GEHF2_C16 phase:ge-hf:gehf2-c16	Al2Cu · C16 · tI12 · I4/mcm (140)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2294.83 K, x(Hf) 0.66667–0.66667	4	1
GEHF3 phase:ge-hf:gehf3	Ti3P · tP32 · P4_2/n (86)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–2257.18 K, x(Hf) 0.75–0.75	6	1
HCP_A3 phase:ge-hf:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2015.94 K, x(Hf) 0.99996–1	2	1
LIQUID phase:ge-hf:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1206.82–4000 K, x(Hf) 0–1	18	1

DIAMOND_A4 (Ge–Hf)

Id: phase:ge-hf: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(Hf) 0–0
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ge-hf:a4-diamond, corpus:phase:ge-hf:diamond-a4
paper: paper:10.1007/s10853-013-7814-7:(Ge)
tdb: tdb:GeHf-14Tan.tdb:DIAMOND_A4

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

GeHf-14Tan.tdb: DIAMOND_A4, type code %, sha256 574342ac8bd9d16b…

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

Example references (1 of 1; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase

BCC_A2 (Ge–Hf)

Id: phase:ge-hf: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): 2015.94–3999.33 K, x(Hf) 0.99993–1
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-hf:bcc-a2
paper: paper:10.1007/s10853-013-7814-7:(βHf)
tdb: tdb:GeHf-14Tan.tdb:BCC_A2

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

GeHf-14Tan.tdb: BCC_A2, type code %B, sha256 574342ac8bd9d16b…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : GE HF% : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase

FCC_A1 (Ge–Hf)

Id: phase:ge-hf: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:ge-hf:fcc-a1
tdb: tdb:GeHf-14Tan.tdb:FCC_A1

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

GeHf-14Tan.tdb: FCC_A1, type code %A, sha256 574342ac8bd9d16b…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : GE HF : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase

GE2HF_C49 (Ge–Hf)

Id: phase:ge-hf:ge2hf-c49; status assigned
Structure: ZrSi2 · C49 · oC12 · Cmcm (63); type st:c49-zrsi2-oc12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaugh and oqmd-3543, space group 63
Stoichiometry: Ge 0.6667, Hf 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–2022.59 K, x(Hf) 0.33333–0.33333
Literature: 5 values (5 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ge-hf:ge2hf-c49
mp: mp:mp-aaaaaugh
oqmd: oqmd:oqmd-3543
paper: paper:10.1007/s10853-013-7814-7:HfGe2
tdb: tdb:GeHf-14Tan.tdb:GE2HF_C49

TDB models of GE2HF_C49 (1): PHASE and CONSTITUENT statements as written

GeHf-14Tan.tdb: GE2HF_C49, type code %, sha256 574342ac8bd9d16b…

52: PHASE GE2HF_C49 % 2 2 1 !
53: CONST GE2HF_C49 : GE : HF : !

Example references (1 of 1; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase

GE2HF3_D5A (Ge–Hf)

Id: phase:ge-hf:ge2hf3-d5a; status assigned
Structure: Si2U3 · D5_a · tP10 · P4/mbm (127); type st:d5-a-si2u3-tp10; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacdoez and oqmd-30438, space group 127
Stoichiometry: Ge 0.4000, Hf 0.6000
Stability: stable in 1 of 1 calculated diagram(s): 1514.4–2433.25 K, x(Hf) 0.6–0.6
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ge-hf:ge2hf3-d5a
mp: mp:mp-aaacdoez
oqmd: oqmd:oqmd-30438
paper: paper:10.1007/s10853-013-7814-7:Hf3Ge2
tdb: tdb:GeHf-14Tan.tdb:GE2HF3_D5A

TDB models of GE2HF3_D5A (1): PHASE and CONSTITUENT statements as written

GeHf-14Tan.tdb: GE2HF3_D5A, type code %, sha256 574342ac8bd9d16b…

62: PHASE GE2HF3_D5A % 2 2 3 !
63: CONST GE2HF3_D5A : GE : HF : !

Example references (2 of 2; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase
doi:10.1007/bf03029294 Gokhale AB, Abbaschian R (1990) Bull Alloy Phase Diagr 11(3):253
cited as the source of values for this phase

GE3HF5_D88 (Ge–Hf)

Id: phase:ge-hf:ge3hf5-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
Stoichiometry: Ge 0.3750, Hf 0.6250
Stability: stable in 1 of 1 calculated diagram(s): 300–2466.19 K, x(Hf) 0.625–0.625
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-hf:ge3hf5-d88
paper: paper:10.1007/s10853-013-7814-7:Hf5Ge3
tdb: tdb:GeHf-14Tan.tdb:GE3HF5_D88

TDB models of GE3HF5_D88 (1): PHASE and CONSTITUENT statements as written

GeHf-14Tan.tdb: GE3HF5_D88, type code %, sha256 574342ac8bd9d16b…

67: PHASE GE3HF5_D88 % 2 3 5 !
68: CONST GE3HF5_D88 : GE : HF : !

Example references (2 of 2; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase
doi:10.1007/bf03029294 Gokhale AB, Abbaschian R (1990) Bull Alloy Phase Diagr 11(3):253
cited as the source of values for this phase

GE4HF5 (Ge–Hf)

Id: phase:ge-hf:ge4hf5; 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 (dft_space_group_62_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ge 0.4444, Hf 0.5556
Stability: stable in 1 of 1 calculated diagram(s): 300–2415.3 K, x(Hf) 0.55556–0.55556
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-hf:ge4hf5
paper: paper:10.1007/s10853-013-7814-7:Hf5Ge4
tdb: tdb:GeHf-14Tan.tdb:GE4HF5

TDB models of GE4HF5 (1): PHASE and CONSTITUENT statements as written

GeHf-14Tan.tdb: GE4HF5, type code %, sha256 574342ac8bd9d16b…

57: PHASE GE4HF5 % 2 4 5 !
58: CONST GE4HF5 : GE : HF : !

Example references (1 of 1; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase

GEHF2_C16 (Ge–Hf)

Id: phase:ge-hf:gehf2-c16; status assigned
Structure: Al2Cu · C16 · tI12 · I4/mcm (140); type st:c16-al2cu-ti12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaosh and oqmd-7794, space group 140
Stoichiometry: Ge 0.3333, Hf 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–2294.83 K, x(Hf) 0.66667–0.66667
Literature: 4 values (4 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ge-hf:gehf2-c16
mp: mp:mp-aaaaaosh
oqmd: oqmd:oqmd-7794
paper: paper:10.1007/s10853-013-7814-7:Hf2Ge
tdb: tdb:GeHf-14Tan.tdb:GEHF2_C16

TDB models of GEHF2_C16 (1): PHASE and CONSTITUENT statements as written

GeHf-14Tan.tdb: GEHF2_C16, type code %, sha256 574342ac8bd9d16b…

72: PHASE GEHF2_C16 % 2 1 2 !
73: CONST GEHF2_C16 : GE : HF : !

Example references (2 of 2; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase
doi:10.1007/bf03029294 Gokhale AB, Abbaschian R (1990) Bull Alloy Phase Diagr 11(3):253
cited as the source of values for this phase

GEHF3 (Ge–Hf)

Id: phase:ge-hf:gehf3; status assigned
Structure: Ti3P · tP32 · P4_2/n (86); type st:ti3p-tp32; 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: Ge 0.2500, Hf 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–2257.18 K, x(Hf) 0.75–0.75
Literature: 6 values (6 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-hf:gehf3
paper: paper:10.1007/s10853-013-7814-7:Hf3Ge
tdb: tdb:GeHf-14Tan.tdb:GEHF3

TDB models of GEHF3 (1): PHASE and CONSTITUENT statements as written

GeHf-14Tan.tdb: GEHF3, type code %, sha256 574342ac8bd9d16b…

77: PHASE GEHF3 % 2 1 3 !
78: CONST GEHF3 : GE : HF : !

Example references (2 of 2; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase
doi:10.1007/bf03029294 Gokhale AB, Abbaschian R (1990) Bull Alloy Phase Diagr 11(3):253
cited as the source of values for this phase

HCP_A3 (Ge–Hf)

Id: phase:ge-hf: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): 300–2015.94 K, x(Hf) 0.99996–1
Literature: 2 values (2 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-hf:hcp-a3
paper: paper:10.1007/s10853-013-7814-7:(αHf)
tdb: tdb:GeHf-14Tan.tdb:HCP_A3

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

GeHf-14Tan.tdb: HCP_A3, type code %, sha256 574342ac8bd9d16b…

42: PHASE HCP_A3 % 2 1 0.5 !
43: CONST HCP_A3 : GE HF% : VA : !

Example references (1 of 1; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase

LIQUID (Ge–Hf)

Id: phase:ge-hf:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1206.82–4000 K, x(Hf) 0–1
Literature: 18 values (18 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-hf:liquid
paper: paper:10.1007/s10853-013-7814-7:Liquid
tdb: tdb:GeHf-14Tan.tdb:LIQUID

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

GeHf-14Tan.tdb: LIQUID, type code %, sha256 574342ac8bd9d16b…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : GE HF : !

Example references (2 of 2; assessments first):

doi:10.1007/s10853-013-7814-7 Ying Tang, Biao Hu, Jiong Wang, Yong Du, Kaiming Cheng, Dandan Liu et al., Experimental investigation and thermodynamic assessment of the Hf–Ge system, J Mater Sci 49, 1306-1316 (2014).
assessment that models this phase; reports values for this phase
doi:10.1007/bf03029294 Gokhale AB, Abbaschian R (1990) Bull Alloy Phase Diagr 11(3):253
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}
}