Ge–Na phases

8 phases (tier A 4, tier C 1, liquid 1, needs_review 2); 6 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–Na system page · Markdown · field reference

Phases of the Ge–Na system (8)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
DIAMOND_A4 phase:ge-na:a4-diamond	C (diamond) · A4 · cF8 · Fd-3m (227)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1216.5 K, x(Na) 0–0	0	1
BCC_A2 phase:ge-na:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–370.83 K, x(Na) 1–1	0	1
FCC_A1 phase:ge-na:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	0	1
GE4NA phase:ge-na:ge4na		needs_review	stable in 1 of 1 calculated diagram(s): 300–1430.13 K, x(Na) 0.2–0.2	1	1
GENA phase:ge-na:gena	GeNa · mP32 · P2_1/c (14)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1426.36 K, x(Na) 0.5–0.5	7	1
GENA3 phase:ge-na:gena3		needs_review	stable in 1 of 1 calculated diagram(s): 300–1104.2 K, x(Na) 0.75–0.75	0	1
HCP_A3 phase:ge-na: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:ge-na:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 370.83–2500 K, x(Na) 0–1	0	1

DIAMOND_A4 (Ge–Na)

Id: phase:ge-na: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): 300–1216.5 K, x(Na) 0–0
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-na:a4-diamond
tdb: tdb:GeNa-12Wan.tdb:DIAMOND_A4

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

GeNa-12Wan.tdb: DIAMOND_A4, type code %, sha256 7b555c87d0a1d637…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.01.004 Yaru Wang, Peisheng Wang, Dongdong Zhao, Biao Hu, Yong Du, Honghui Xu et al., Thermodynamic description of the Ge–Na and Ge–K systems using the CALPHAD approach supported by first-principles calculations, Calphad 37, 72-76 (2012).
assessment that models this phase

BCC_A2 (Ge–Na)

Id: phase:ge-na: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): 300–370.83 K, x(Na) 1–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-na:bcc-a2
tdb: tdb:GeNa-12Wan.tdb:BCC_A2

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

GeNa-12Wan.tdb: BCC_A2, type code %B, sha256 7b555c87d0a1d637…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.01.004 Yaru Wang, Peisheng Wang, Dongdong Zhao, Biao Hu, Yong Du, Honghui Xu et al., Thermodynamic description of the Ge–Na and Ge–K systems using the CALPHAD approach supported by first-principles calculations, Calphad 37, 72-76 (2012).
assessment that models this phase

FCC_A1 (Ge–Na)

Id: phase:ge-na: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-na:fcc-a1
tdb: tdb:GeNa-12Wan.tdb:FCC_A1

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

GeNa-12Wan.tdb: FCC_A1, type code %A, sha256 7b555c87d0a1d637…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.01.004 Yaru Wang, Peisheng Wang, Dongdong Zhao, Biao Hu, Yong Du, Honghui Xu et al., Thermodynamic description of the Ge–Na and Ge–K systems using the CALPHAD approach supported by first-principles calculations, Calphad 37, 72-76 (2012).
assessment that models this phase

GE4NA (Ge–Na)

Id: phase:ge-na:ge4na; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (Ge4Na) — Hallstedt 2025 mmc2 row for GE4NA: Ge4Na
Stoichiometry: Ge 0.8000, Na 0.2000
Stability: stable in 1 of 1 calculated diagram(s): 300–1430.13 K, x(Na) 0.2–0.2
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-na:ge4na
paper: paper:10.1016/j.calphad.2012.01.004:Ge4Na
tdb: tdb:GeNa-12Wan.tdb:GE4NA

TDB models of GE4NA (1): PHASE and CONSTITUENT statements as written

GeNa-12Wan.tdb: GE4NA, type code %, sha256 7b555c87d0a1d637…

48: PHASE GE4NA % 2 4 1 !
49: CONST GE4NA : GE : NA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.01.004 Yaru Wang, Peisheng Wang, Dongdong Zhao, Biao Hu, Yong Du, Honghui Xu et al., Thermodynamic description of the Ge–Na and Ge–K systems using the CALPHAD approach supported by first-principles calculations, Calphad 37, 72-76 (2012).
assessment that models this phase; reports values for this phase

GENA (Ge–Na)

Id: phase:ge-na:gena; status assigned
Structure: GeNa · mP32 · P2_1/c (14); type st:gena-mp32; 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_14_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ge 0.5000, Na 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1426.36 K, x(Na) 0.5–0.5
Literature: 7 values (7 accepted) from 1 papers
Interactive: phase registry entry

Names (3): corpus: corpus:phase:ge-na:gena
paper: paper:10.1016/j.calphad.2012.01.004:GeNa
tdb: tdb:GeNa-12Wan.tdb:GENA

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

GeNa-12Wan.tdb: GENA, type code %, sha256 7b555c87d0a1d637…

53: PHASE GENA % 2 1 1 !
54: CONST GENA : GE : NA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.01.004 Yaru Wang, Peisheng Wang, Dongdong Zhao, Biao Hu, Yong Du, Honghui Xu et al., Thermodynamic description of the Ge–Na and Ge–K systems using the CALPHAD approach supported by first-principles calculations, Calphad 37, 72-76 (2012).
assessment that models this phase; reports values for this phase

GENA3 (Ge–Na)

Id: phase:ge-na:gena3; status needs_review
No structure assigned. Why: no_on_hull_entry_in_both; no_structure_token; sgte_mmc2_row_incomplete
Candidate (sgte_mmc2): (GeNa3) — Hallstedt 2025 mmc2 row for GENA3: GeNa3
Stoichiometry: Ge 0.2500, Na 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1104.2 K, x(Na) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-na:gena3
tdb: tdb:GeNa-12Wan.tdb:GENA3

TDB models of GENA3 (1): PHASE and CONSTITUENT statements as written

GeNa-12Wan.tdb: GENA3, type code %, sha256 7b555c87d0a1d637…

58: PHASE GENA3 % 2 1 3 !
59: CONST GENA3 : GE : NA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.01.004 Yaru Wang, Peisheng Wang, Dongdong Zhao, Biao Hu, Yong Du, Honghui Xu et al., Thermodynamic description of the Ge–Na and Ge–K systems using the CALPHAD approach supported by first-principles calculations, Calphad 37, 72-76 (2012).
assessment that models this phase

HCP_A3 (Ge–Na)

Id: phase:ge-na: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:ge-na:hcp-a3
tdb: tdb:GeNa-12Wan.tdb:HCP_A3

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

GeNa-12Wan.tdb: HCP_A3, type code %A, sha256 7b555c87d0a1d637…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.01.004 Yaru Wang, Peisheng Wang, Dongdong Zhao, Biao Hu, Yong Du, Honghui Xu et al., Thermodynamic description of the Ge–Na and Ge–K systems using the CALPHAD approach supported by first-principles calculations, Calphad 37, 72-76 (2012).
assessment that models this phase

LIQUID (Ge–Na)

Id: phase:ge-na:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 370.83–2500 K, x(Na) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ge-na:liquid
tdb: tdb:GeNa-12Wan.tdb:LIQUID

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

GeNa-12Wan.tdb: LIQUID, type code %, sha256 7b555c87d0a1d637…

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

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2012.01.004 Yaru Wang, Peisheng Wang, Dongdong Zhao, Biao Hu, Yong Du, Honghui Xu et al., Thermodynamic description of the Ge–Na and Ge–K systems using the CALPHAD approach supported by first-principles calculations, Calphad 37, 72-76 (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}
}