H–Nd phases

7 phases (tier A 3, tier C 1, liquid 1, gas 1, unresolved_no_candidates 1); 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 · Markdown · field reference

Phases of the H–Nd system (7)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:h-nd:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 1086.59–2361.45 K, x(H) 0–0.54516	1
DHCP phase:h-nd:dhcp-a3	alpha-La · A3' · hP4 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1203 K, x(H) 0–0.17182	1
FCC_A1 phase:h-nd:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
GAS phase:h-nd:gas	gas	gas	stable in 1 of 1 calculated diagram(s): 300–2500 K, x(H) 0.9817–1	1
LIQUID phase:h-nd:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 1215.19–2500 K, x(H) 0–0.00503	1
NDH_GAMMA phase:h-nd:ndh-gamma		unresolved_no_candidates	stable in 1 of 1 calculated diagram(s): 947.8–1159.89 K, x(H) 0.18876–0.33765	1
NDH2 phase:h-nd:ndh2	CeH3 · cF44 · Fm-3m (225)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1373.17 K, x(H) 0.65323–0.66844	1

BCC_A2 (H–Nd)

Id: phase:h-nd: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): 1086.59–2361.45 K, x(H) 0–0.54516
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-nd:bcc-a2
tdb: tdb:NdH-15Luo.tdb:BCC_A2

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

NdH-15Luo.tdb: BCC_A2, type code %B, sha256 f14a165b6109893d…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : ND : H VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.009 Q. Luo, S.-L. Chen, J.-Y. Zhang, L. Li, K.-C. Chou, Q. Li, Calphad, 51, 282-91(2015).
assessment that models this phase

DHCP (H–Nd)

Id: phase:h-nd:dhcp-a3; status assigned
Structure: alpha-La · A3' · hP4 · P6_3/mmc (194); type st:a3-alpha-la-hp4; tier A: standard phase name; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–1203 K, x(H) 0–0.17182
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-nd:dhcp-a3
tdb: tdb:NdH-15Luo.tdb:DHCP

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

NdH-15Luo.tdb: DHCP, type code %, sha256 f14a165b6109893d…

40: PHASE DHCP % 2 1 2 !
41: CONST DHCP : ND : H VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.009 Q. Luo, S.-L. Chen, J.-Y. Zhang, L. Li, K.-C. Chou, Q. Li, Calphad, 51, 282-91(2015).
assessment that models this phase

FCC_A1 (H–Nd)

Id: phase:h-nd: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:h-nd:fcc-a1
tdb: tdb:NdH-15Luo.tdb:FCC_A1

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

NdH-15Luo.tdb: FCC_A1, type code %A, sha256 f14a165b6109893d…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : ND : H VA% : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.009 Q. Luo, S.-L. Chen, J.-Y. Zhang, L. Li, K.-C. Chou, Q. Li, Calphad, 51, 282-91(2015).
assessment that models this phase

GAS (H–Nd)

Id: phase:h-nd:gas; status assigned
Structure: gas; type st:gas; gas; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 300–2500 K, x(H) 0.9817–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-nd:gas
tdb: tdb:NdH-15Luo.tdb:GAS

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

NdH-15Luo.tdb: GAS, type code %, sha256 f14a165b6109893d…

54: PHASE GAS:G % 1 1 !
55: CONST GAS:G : ND H H2 : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.009 Q. Luo, S.-L. Chen, J.-Y. Zhang, L. Li, K.-C. Chou, Q. Li, Calphad, 51, 282-91(2015).
assessment that models this phase

LIQUID (H–Nd)

Id: phase:h-nd:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 1215.19–2500 K, x(H) 0–0.00503
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-nd:liquid
tdb: tdb:NdH-15Luo.tdb:LIQUID

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

NdH-15Luo.tdb: LIQUID, type code %, sha256 f14a165b6109893d…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : H ND : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.009 Q. Luo, S.-L. Chen, J.-Y. Zhang, L. Li, K.-C. Chou, Q. Li, Calphad, 51, 282-91(2015).
assessment that models this phase

NDH_GAMMA (H–Nd)

Id: phase:h-nd:ndh-gamma; status unresolved_no_candidates
No structure assigned. Why: no_structure_token; off_stoichiometric_model
Stability: stable in 1 of 1 calculated diagram(s): 947.8–1159.89 K, x(H) 0.18876–0.33765
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-nd:ndh-gamma
tdb: tdb:NdH-15Luo.tdb:NDH_GAMMA

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

NdH-15Luo.tdb: NDH_GAMMA, type code %, sha256 f14a165b6109893d…

45: PHASE NDH_GAMMA % 2 1 2 !
46: CONST NDH_GAMMA : ND : H VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.009 Q. Luo, S.-L. Chen, J.-Y. Zhang, L. Li, K.-C. Chou, Q. Li, Calphad, 51, 282-91(2015).
assessment that models this phase

NDH2 (H–Nd)

Id: phase:h-nd:ndh2; status assigned
Structure: CeH3 · cF44 · Fm-3m (225); type st:ceh3-cf44; 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, off_stoichiometric_model); structure as stated in the SGTE crystallographic table for this phase name and system
Stability: stable in 1 of 1 calculated diagram(s): 300–1373.17 K, x(H) 0.65323–0.66844
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:h-nd:ndh2
tdb: tdb:NdH-15Luo.tdb:NDH2

TDB models of NDH2 (1): PHASE and CONSTITUENT statements as written

NdH-15Luo.tdb: NDH2, type code %, sha256 f14a165b6109893d…

51: PHASE NDH2 % 3 1 2 1 !
52: CONST NDH2 : ND : H VA : H VA : !

Example references (1 of 1; assessments first):

doi:10.1016/j.calphad.2015.10.009 Q. Luo, S.-L. Chen, J.-Y. Zhang, L. Li, K.-C. Chou, Q. Li, Calphad, 51, 282-91(2015).
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}
}