Ca–Ge phases

10 phases (tier A 8, tier C 1, liquid 1); 9 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 · Ca–Ge system page · Markdown · field reference

Phases of the Ca–Ge system (10)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:ca-ge:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2499.8 K, x(Ge) 1–1	3	1
BCC_A2 phase:ca-ge:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 716.03–1115 K, x(Ge) 0–0	3	1
CA2GE_C37 phase:ca-ge:ca2ge-c37	Co2Si · C37 · oP12 · Pnma (62)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1579.56 K, x(Ge) 0.33333–0.33333	13	1
CA5GE3_D8L phase:ca-ge:ca5ge3-d8l	Cr5B3 · D8_l · tI32 · I4/mcm (140)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1505.68 K, x(Ge) 0.375–0.375	10	1
CA7GE6 phase:ca-ge:ca7ge6	Ca7Sn6 · oP52 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1441.44 K, x(Ge) 0.46154–0.46154	8	1
CAGE_B33 phase:ca-ge:cage-b33	CrB · B33 · oC8 · Cmcm (63)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1447.01 K, x(Ge) 0.5–0.5	14	1
CAGE2_C12 phase:ca-ge:cage2-c12	CaSi2 · C12 · hR6 · R-3m (166)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1116.25 K, x(Ge) 0.66667–0.66667	14	1
FCC_A1 phase:ca-ge:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–716.03 K, x(Ge) 0–0	0	1
HCP_A3 phase:ca-ge:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
LIQUID phase:ca-ge:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1045.38–2500 K, x(Ge) 0–1	22	1

DIAMOND_A4 (Ca–Ge)

Id: phase:ca-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): 300–2499.8 K, x(Ge) 1–1
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ca-ge:a4-diamond, corpus:phase:ca-ge:diamond-a4
paper: paper:10.1016/j.jallcom.2010.02.189:Ge
tdb: tdb:CaGe-10Dja.tdb:DIAMOND_A4

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

CaGe-10Dja.tdb: DIAMOND_A4, type code %, sha256 cb8f461fa9247dd9…

43: PHASE DIAMOND_A4 % 1 1 !
44: CONST DIAMOND_A4 : GE : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(02)00326-2 A Palenzona, P Manfrinetti, M.L Fornasini, The phase diagram of the Ca–Ge system, Journal of Alloys and Compounds 345, 144-147 (2002).
cited as the source of values for this phase

BCC_A2 (Ca–Ge)

Id: phase:ca-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: stable in 1 of 1 calculated diagram(s): 716.03–1115 K, x(Ge) 0–0
Literature: 3 values (3 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ca-ge:bcc-a2
paper: paper:10.1016/j.jallcom.2010.02.189:βCa
tdb: tdb:CaGe-10Dja.tdb:BCC_A2

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

CaGe-10Dja.tdb: BCC_A2, type code %B, sha256 cb8f461fa9247dd9…

33: PHASE BCC_A2 %B 2 1 3 !
34: CONST BCC_A2 : CA% GE : VA : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(02)00326-2 A Palenzona, P Manfrinetti, M.L Fornasini, The phase diagram of the Ca–Ge system, Journal of Alloys and Compounds 345, 144-147 (2002).
cited as the source of values for this phase

CA2GE_C37 (Ca–Ge)

Id: phase:ca-ge:ca2ge-c37; status assigned
Structure: Co2Si · C37 · oP12 · Pnma (62); type st:c37-co2si-op12; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaaals and oqmd-7763, space group 62
Stoichiometry: Ca 0.6667, Ge 0.3333
Stability: stable in 1 of 1 calculated diagram(s): 300–1579.56 K, x(Ge) 0.33333–0.33333
Literature: 13 values (13 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ca-ge:ca2ge-c37
mp: mp:mp-aaaaaals
oqmd: oqmd:oqmd-7763
paper: paper:10.1016/j.jallcom.2010.02.189:Ca2Ge
tdb: tdb:CaGe-10Dja.tdb:CA2GE_C37

TDB models of CA2GE_C37 (1): PHASE and CONSTITUENT statements as written

CaGe-10Dja.tdb: CA2GE_C37, type code %, sha256 cb8f461fa9247dd9…

48: PHASE CA2GE_C37 % 2 2 1 !
49: CONST CA2GE_C37 : CA : GE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(02)00326-2 A Palenzona, P Manfrinetti, M.L Fornasini, The phase diagram of the Ca–Ge system, Journal of Alloys and Compounds 345, 144-147 (2002).
cited as the source of values for this phase
doi:10.1016/j.jssc.2009.11.007 Zhiwen Yang, Dongmin Shi, Bin Wen, Roderick Melnik, Shan Yao, Tingju Li, First-principle studies of Ca–X (X=Si,Ge,Sn,Pb) intermetallic compounds, Journal of Solid State Chemistry 183, 136-143 (2010).
cited as the source of values for this phase

CA5GE3_D8L (Ca–Ge)

Id: phase:ca-ge:ca5ge3-d8l; status assigned
Structure: Cr5B3 · D8_l · tI32 · I4/mcm (140); type st:d8-l-cr5b3-ti32; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaacum and oqmd-7694, space group 140
Stoichiometry: Ca 0.6250, Ge 0.3750
Stability: stable in 1 of 1 calculated diagram(s): 300–1505.68 K, x(Ge) 0.375–0.375
Literature: 10 values (10 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ca-ge:ca5ge3-d8l
mp: mp:mp-aaaaacum
oqmd: oqmd:oqmd-7694
paper: paper:10.1016/j.jallcom.2010.02.189:Ca5Ge3
tdb: tdb:CaGe-10Dja.tdb:CA5GE3_D8L

TDB models of CA5GE3_D8L (1): PHASE and CONSTITUENT statements as written

CaGe-10Dja.tdb: CA5GE3_D8L, type code %, sha256 cb8f461fa9247dd9…

53: PHASE CA5GE3_D8L % 2 5 3 !
54: CONST CA5GE3_D8L : CA : GE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(02)00326-2 A Palenzona, P Manfrinetti, M.L Fornasini, The phase diagram of the Ca–Ge system, Journal of Alloys and Compounds 345, 144-147 (2002).
cited as the source of values for this phase
doi:10.1016/j.jssc.2009.11.007 Zhiwen Yang, Dongmin Shi, Bin Wen, Roderick Melnik, Shan Yao, Tingju Li, First-principle studies of Ca–X (X=Si,Ge,Sn,Pb) intermetallic compounds, Journal of Solid State Chemistry 183, 136-143 (2010).
cited as the source of values for this phase

CA7GE6 (Ca–Ge)

Id: phase:ca-ge:ca7ge6; status assigned
Structure: Ca7Sn6 · oP52 · Pnma (62); type st:ca7sn6-op52; 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: Ca 0.5385, Ge 0.4615
Stability: stable in 1 of 1 calculated diagram(s): 300–1441.44 K, x(Ge) 0.46154–0.46154
Literature: 8 values (8 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ca-ge:ca7ge6
paper: paper:10.1016/j.jallcom.2010.02.189:Ca7Ge6
tdb: tdb:CaGe-10Dja.tdb:CA7GE6

TDB models of CA7GE6 (1): PHASE and CONSTITUENT statements as written

CaGe-10Dja.tdb: CA7GE6, type code %, sha256 cb8f461fa9247dd9…

58: PHASE CA7GE6 % 2 7 6 !
59: CONST CA7GE6 : CA : GE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(02)00326-2 A Palenzona, P Manfrinetti, M.L Fornasini, The phase diagram of the Ca–Ge system, Journal of Alloys and Compounds 345, 144-147 (2002).
cited as the source of values for this phase
doi:10.1016/j.jssc.2009.11.007 Zhiwen Yang, Dongmin Shi, Bin Wen, Roderick Melnik, Shan Yao, Tingju Li, First-principle studies of Ca–X (X=Si,Ge,Sn,Pb) intermetallic compounds, Journal of Solid State Chemistry 183, 136-143 (2010).
cited as the source of values for this phase

CAGE_B33 (Ca–Ge)

Id: phase:ca-ge:cage-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-aaaaadmu and oqmd-7940, space group 63
Stoichiometry: Ca 0.5000, Ge 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1447.01 K, x(Ge) 0.5–0.5
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ca-ge:cage-b33
mp: mp:mp-aaaaadmu
oqmd: oqmd:oqmd-7940
paper: paper:10.1016/j.jallcom.2010.02.189:CaGe
tdb: tdb:CaGe-10Dja.tdb:CAGE_B33

TDB models of CAGE_B33 (1): PHASE and CONSTITUENT statements as written

CaGe-10Dja.tdb: CAGE_B33, type code %, sha256 cb8f461fa9247dd9…

63: PHASE CAGE_B33 % 2 1 1 !
64: CONST CAGE_B33 : CA : GE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(02)00326-2 A Palenzona, P Manfrinetti, M.L Fornasini, The phase diagram of the Ca–Ge system, Journal of Alloys and Compounds 345, 144-147 (2002).
cited as the source of values for this phase
doi:10.1016/j.jssc.2009.11.007 Zhiwen Yang, Dongmin Shi, Bin Wen, Roderick Melnik, Shan Yao, Tingju Li, First-principle studies of Ca–X (X=Si,Ge,Sn,Pb) intermetallic compounds, Journal of Solid State Chemistry 183, 136-143 (2010).
cited as the source of values for this phase

CAGE2_C12 (Ca–Ge)

Id: phase:ca-ge:cage2-c12; status assigned
Structure: CaSi2 · C12 · hR6 · R-3m (166); type st:c12-casi2-hr6; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaabghlg and oqmd-13940, space group 166
Stoichiometry: Ca 0.3333, Ge 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1116.25 K, x(Ge) 0.66667–0.66667
Literature: 14 values (14 accepted) from 1 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ca-ge:cage2-c12
mp: mp:mp-aaabghlg
oqmd: oqmd:oqmd-13940
paper: paper:10.1016/j.jallcom.2010.02.189:CaGe2
tdb: tdb:CaGe-10Dja.tdb:CAGE2_C12

TDB models of CAGE2_C12 (1): PHASE and CONSTITUENT statements as written

CaGe-10Dja.tdb: CAGE2_C12, type code %, sha256 cb8f461fa9247dd9…

68: PHASE CAGE2_C12 % 2 1 2 !
69: CONST CAGE2_C12 : CA : GE : !

Example references (3 of 3; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(02)00326-2 A Palenzona, P Manfrinetti, M.L Fornasini, The phase diagram of the Ca–Ge system, Journal of Alloys and Compounds 345, 144-147 (2002).
cited as the source of values for this phase
doi:10.1016/j.jssc.2009.11.007 Zhiwen Yang, Dongmin Shi, Bin Wen, Roderick Melnik, Shan Yao, Tingju Li, First-principle studies of Ca–X (X=Si,Ge,Sn,Pb) intermetallic compounds, Journal of Solid State Chemistry 183, 136-143 (2010).
cited as the source of values for this phase

FCC_A1 (Ca–Ge)

Id: phase:ca-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: stable in 1 of 1 calculated diagram(s): 300–716.03 K, x(Ge) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ca-ge:fcc-a1
tdb: tdb:CaGe-10Dja.tdb:FCC_A1

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

CaGe-10Dja.tdb: FCC_A1, type code %A, sha256 cb8f461fa9247dd9…

28: PHASE FCC_A1 %A 2 1 1 !
29: CONST FCC_A1 : CA% GE : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase

HCP_A3 (Ca–Ge)

Id: phase:ca-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: not stable in 1 calculated diagram(s)
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ca-ge:hcp-a3
tdb: tdb:CaGe-10Dja.tdb:HCP_A3

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

CaGe-10Dja.tdb: HCP_A3, type code %A, sha256 cb8f461fa9247dd9…

38: PHASE HCP_A3 %A 2 1 0.5 !
39: CONST HCP_A3 : CA GE : VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase

LIQUID (Ca–Ge)

Id: phase:ca-ge:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1045.38–2500 K, x(Ge) 0–1
Literature: 22 values (22 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ca-ge:liquid
paper: paper:10.1016/j.jallcom.2010.02.189:Liq
tdb: tdb:CaGe-10Dja.tdb:LIQUID

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

CaGe-10Dja.tdb: LIQUID, type code %, sha256 cb8f461fa9247dd9…

23: PHASE LIQUID:L % 1 1 !
24: CONST LIQUID:L : CA GE : !

Example references (2 of 2; assessments first):

doi:10.1016/j.jallcom.2010.02.189 Y. Djaballah, A. Pasturel, A. Belgacem-Bouzida, Thermodynamic assessment of the calcium–germanium system, Journal of Alloys and Compounds 497, 74-79 (2010).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(02)00326-2 A Palenzona, P Manfrinetti, M.L Fornasini, The phase diagram of the Ca–Ge system, Journal of Alloys and Compounds 345, 144-147 (2002).
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}
}