Ho–Zn phases

12 phases (tier A 5, tier C 6, 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 · Ho–Zn system page · Markdown · field reference

Phases of the Ho–Zn system (12)
Phase	Structure	Basis	Stability (calculated)	TDB models
BCC_A2 phase:ho-zn:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
FCC_A1 phase:ho-zn:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	not stable in 1 calculated diagram(s)	1
HCP_A3 phase:ho-zn:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–2498.92 K, x(Zn) 0–1	1
HO13ZN58 phase:ho-zn:ho13zn58	Gd13Zn58 · hP142 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1197.16 K, x(Zn) 0.8169–0.8169	1
HO2ZN17_HT phase:ho-zn:ho2zn17-ht	Th2Zn17 · hR19 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 1025.49–1177.13 K, x(Zn) 0.89474–0.89474	1
HO2ZN17_LT phase:ho-zn:ho2zn17-lt	Ni17Th2 · hP38 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1025.49 K, x(Zn) 0.89474–0.89474	1
HOZN_B2 phase:ho-zn:hozn-b2	CsCl · B2 · cP2 · Pm-3m (221)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–1381.44 K, x(Zn) 0.5–0.5	1
HOZN12_D2B phase:ho-zn:hozn12-d2b	Mn12Th · D2_b · tI26 · I4/mmm (139)	tier A: standard phase name	stable in 1 of 1 calculated diagram(s): 300–960.99 K, x(Zn) 0.92308–0.92308	1
HOZN2 phase:ho-zn:hozn2	Hg2K · oI12 · Imma (74)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1327.8 K, x(Zn) 0.66667–0.66667	1
HOZN3 phase:ho-zn:hozn3	YZn3 · oP16 · Pnma (62)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1182.03 K, x(Zn) 0.75–0.75	1
HOZN5 phase:ho-zn:hozn5	ErZn5 · hP36 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 1 of 1 calculated diagram(s): 300–1166.19 K, x(Zn) 0.83333–0.83333	1
LIQUID phase:ho-zn:liquid	liquid	liquid	stable in 1 of 1 calculated diagram(s): 692.67–2500 K, x(Zn) 0–1	1

BCC_A2 (Ho–Zn)

Id: phase:ho-zn: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:ho-zn:bcc-a2
tdb: tdb:HoZn-19Fre.tdb:BCC_A2

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

HoZn-19Fre.tdb: BCC_A2, type code %B, sha256 801cc0583db17e0f…

30: PHASE BCC_A2 %B 2 1 3 !
31: CONST BCC_A2 : HO ZN : VA : !

FCC_A1 (Ho–Zn)

Id: phase:ho-zn:fcc-a1; status assigned
Structure: Cu · A1 · cF4 · Fm-3m (225); type st:a1-cu-cf4; tier A: standard phase name; confidence high
Stoichiometry: Zn 1.0000
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:ho-zn:fcc-a1
tdb: tdb:HoZn-19Fre.tdb:FCC_A1

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

HoZn-19Fre.tdb: FCC_A1, type code %A, sha256 801cc0583db17e0f…

25: PHASE FCC_A1 %A 2 1 1 !
26: CONST FCC_A1 : ZN : VA : !

HCP_A3 (Ho–Zn)

Id: phase:ho-zn: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): 300–2498.92 K, x(Zn) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ho-zn:hcp-a3
tdb: tdb:HoZn-19Fre.tdb:HCP_A3

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

HoZn-19Fre.tdb: HCP_A3, type code %, sha256 801cc0583db17e0f…

35: PHASE HCP_A3 % 2 1 0.5 !
36: CONST HCP_A3 : HO% ZN% : VA : !

HO13ZN58 (Ho–Zn)

Id: phase:ho-zn:ho13zn58; status assigned
Structure: Gd13Zn58 · hP142 · P6_3/mmc (194); type st:gd13zn58-hp142; 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: Ho 0.1831, Zn 0.8169
Stability: stable in 1 of 1 calculated diagram(s): 300–1197.16 K, x(Zn) 0.8169–0.8169
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ho-zn:ho13zn58
tdb: tdb:HoZn-19Fre.tdb:HO13ZN58

TDB models of HO13ZN58 (1): PHASE and CONSTITUENT statements as written

HoZn-19Fre.tdb: HO13ZN58, type code %, sha256 801cc0583db17e0f…

55: PHASE HO13ZN58 % 2 13 58 !
56: CONST HO13ZN58 : HO : ZN : !

HO2ZN17_HT (Ho–Zn)

Id: phase:ho-zn:ho2zn17-ht; status assigned
Structure: Th2Zn17 · hR19 · R-3m (166); type st:th2zn17-hr19; 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: Ho 0.1053, Zn 0.8947
Stability: stable in 1 of 1 calculated diagram(s): 1025.49–1177.13 K, x(Zn) 0.89474–0.89474
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ho-zn:ho2zn17-ht
tdb: tdb:HoZn-19Fre.tdb:HO2ZN17_HT

TDB models of HO2ZN17_HT (1): PHASE and CONSTITUENT statements as written

HoZn-19Fre.tdb: HO2ZN17_HT, type code %, sha256 801cc0583db17e0f…

70: PHASE HO2ZN17_HT % 2 2 17 !
71: CONST HO2ZN17_HT : HO : ZN : !

HO2ZN17_LT (Ho–Zn)

Id: phase:ho-zn:ho2zn17-lt; status assigned
Structure: Ni17Th2 · hP38 · P6_3/mmc (194); type st:ni17th2-hp38; 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: Ho 0.1053, Zn 0.8947
Stability: stable in 1 of 1 calculated diagram(s): 300–1025.49 K, x(Zn) 0.89474–0.89474
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ho-zn:ho2zn17-lt
tdb: tdb:HoZn-19Fre.tdb:HO2ZN17_LT

TDB models of HO2ZN17_LT (1): PHASE and CONSTITUENT statements as written

HoZn-19Fre.tdb: HO2ZN17_LT, type code %, sha256 801cc0583db17e0f…

65: PHASE HO2ZN17_LT % 2 2 17 !
66: CONST HO2ZN17_LT : HO : ZN : !

HOZN_B2 (Ho–Zn)

Id: phase:ho-zn:hozn-b2; status assigned
Structure: CsCl · B2 · cP2 · Pm-3m (221); type st:b2-cscl-cp2; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaadin and oqmd-89929, space group 221
Stoichiometry: Ho 0.5000, Zn 0.5000
Stability: stable in 1 of 1 calculated diagram(s): 300–1381.44 K, x(Zn) 0.5–0.5
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ho-zn:hozn-b2
mp: mp:mp-aaaaadin
oqmd: oqmd:oqmd-89929
tdb: tdb:HoZn-19Fre.tdb:HOZN_B2

TDB models of HOZN_B2 (1): PHASE and CONSTITUENT statements as written

HoZn-19Fre.tdb: HOZN_B2, type code %, sha256 801cc0583db17e0f…

40: PHASE HOZN_B2 % 2 1 1 !
41: CONST HOZN_B2 : HO : ZN : !

HOZN12_D2B (Ho–Zn)

Id: phase:ho-zn:hozn12-d2b; status assigned
Structure: Mn12Th · D2_b · tI26 · I4/mmm (139); type st:d2-b-mn12th-ti26; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaackuxh and oqmd-30567, space group 139
Stoichiometry: Ho 0.0769, Zn 0.9231
Stability: stable in 1 of 1 calculated diagram(s): 300–960.99 K, x(Zn) 0.92308–0.92308
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ho-zn:hozn12-d2b
mp: mp:mp-aaackuxh
oqmd: oqmd:oqmd-30567
tdb: tdb:HoZn-19Fre.tdb:HOZN12_D2B

TDB models of HOZN12_D2B (1): PHASE and CONSTITUENT statements as written

HoZn-19Fre.tdb: HOZN12_D2B, type code %, sha256 801cc0583db17e0f…

75: PHASE HOZN12_D2B % 2 1 12 !
76: CONST HOZN12_D2B : HO : ZN : !

HOZN2 (Ho–Zn)

Id: phase:ho-zn:hozn2; status assigned
Structure: Hg2K · oI12 · Imma (74); type st:hg2k-oi12; 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_74_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ho 0.3333, Zn 0.6667
Stability: stable in 1 of 1 calculated diagram(s): 300–1327.8 K, x(Zn) 0.66667–0.66667
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ho-zn:hozn2
tdb: tdb:HoZn-19Fre.tdb:HOZN2

TDB models of HOZN2 (1): PHASE and CONSTITUENT statements as written

HoZn-19Fre.tdb: HOZN2, type code %, sha256 801cc0583db17e0f…

45: PHASE HOZN2 % 2 1 2 !
46: CONST HOZN2 : HO : ZN : !

HOZN3 (Ho–Zn)

Id: phase:ho-zn:hozn3; status assigned
Structure: YZn3 · oP16 · Pnma (62); type st:yzn3-op16; 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_4_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ho 0.2500, Zn 0.7500
Stability: stable in 1 of 1 calculated diagram(s): 300–1182.03 K, x(Zn) 0.75–0.75
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ho-zn:hozn3
tdb: tdb:HoZn-19Fre.tdb:HOZN3

TDB models of HOZN3 (1): PHASE and CONSTITUENT statements as written

HoZn-19Fre.tdb: HOZN3, type code %, sha256 801cc0583db17e0f…

50: PHASE HOZN3 % 2 1 3 !
51: CONST HOZN3 : HO : ZN : !

HOZN5 (Ho–Zn)

Id: phase:ho-zn:hozn5; status assigned
Structure: ErZn5 · hP36 · P6_3/mmc (194); type st:erzn5-hp36; 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: Ho 0.1667, Zn 0.8333
Stability: stable in 1 of 1 calculated diagram(s): 300–1166.19 K, x(Zn) 0.83333–0.83333
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ho-zn:hozn5
tdb: tdb:HoZn-19Fre.tdb:HOZN5

TDB models of HOZN5 (1): PHASE and CONSTITUENT statements as written

HoZn-19Fre.tdb: HOZN5, type code %, sha256 801cc0583db17e0f…

60: PHASE HOZN5 % 2 1 5 !
61: CONST HOZN5 : HO : ZN : !

LIQUID (Ho–Zn)

Id: phase:ho-zn:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 1 of 1 calculated diagram(s): 692.67–2500 K, x(Zn) 0–1
Literature: 0 values (0 accepted) from 0 papers
Interactive: phase registry entry

Names (2): corpus: corpus:phase:ho-zn:liquid
tdb: tdb:HoZn-19Fre.tdb:LIQUID

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

HoZn-19Fre.tdb: LIQUID, type code %, sha256 801cc0583db17e0f…

20: PHASE LIQUID:L % 1 1 !
21: CONST LIQUID:L : HO ZN : !

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}
}