Ho–Ni phases

13 phases (tier A 7, tier B 1, tier C 4, liquid 1); 12 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–Ni system page · Markdown · field reference

Phases of the Ho–Ni system (13)
Phase	Structure	Basis	Stability (calculated)	Literature values	TDB models
BCC_A2 phase:ho-ni:bcc-a2	W · A2 · cI2 · Im-3m (229)	tier A: standard phase name	not stable in 2 calculated diagram(s)	1	2
FCC_A1 phase:ho-ni:fcc-a1	Cu · A1 · cF4 · Fm-3m (225)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–2499.72 K, x(Ni) 0.99998–1	7	2
HCP_A3 phase:ho-ni:hcp-a3	Mg · A3 · hP2 · P6_3/mmc (194)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1782.44 K, x(Ni) 0–8e-05	10	2
HO2NI17 phase:ho-ni:ho2ni17	Ni17Th2 · hP38 · P6_3/mmc (194)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1561.5 K, x(Ni) 0.89474–0.89474	20	2
HO2NI7 phase:ho-ni:ho2ni7	Co7Gd2 · hR18 · R-3m (166)	tier B: DFT-supported (unique MP + OQMD match)	stable in 2 of 2 calculated diagram(s): 300–1592.57 K, x(Ni) 0.77778–0.77778	19	2
HO3NI_D011 phase:ho-ni:ho3ni-d011	Fe3C · D0_11 · oP16 · Pnma (62)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1027.44 K, x(Ni) 0.25–0.25	18	2
HO3NI2_HT phase:ho-ni:ho3ni2-ht	Er3Ni2 · hR15 · R-3 (148)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 1030.24–1254.92 K, x(Ni) 0.4–0.4	15	2
HO3NI2_LT phase:ho-ni:ho3ni2-lt	Dy3Ni2 · mC20 · C2/m (12)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1031 K, x(Ni) 0.4–0.4	20	2
HONI_B27 phase:ho-ni:honi-b27	FeB · B27 · oP8 · Pnma (62)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1341.68 K, x(Ni) 0.5–0.5	27	2
HONI2_C15 phase:ho-ni:honi2-c15	Cu2Mg · C15 · cF24 · Fd-3m (227)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1469.69 K, x(Ni) 0.65686–0.66667	18	2
HONI3 phase:ho-ni:honi3	Ni3Pu · hR12 · R-3m (166)	tier C: assessor-stated (Hallstedt 2025 crystallographic table)	stable in 2 of 2 calculated diagram(s): 300–1560.42 K, x(Ni) 0.75–0.75	19	2
HONI5_D2D phase:ho-ni:honi5-d2d	CaCu5 · D2_d · hP6 · P6/mmm (191)	tier A: standard phase name	stable in 2 of 2 calculated diagram(s): 300–1645.82 K, x(Ni) 0.83333–0.83333	24	2
LIQUID phase:ho-ni:liquid	liquid	liquid	stable in 2 of 2 calculated diagram(s): 1002.77–2500 K, x(Ni) 0–1	73	2

BCC_A2 (Ho–Ni)

Id: phase:ho-ni: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 2 calculated diagram(s)
Literature: 1 values (1 accepted) from 1 papers
Interactive: phase registry entry

Names (4): corpus: corpus:phase:ho-ni:bcc-a2
paper: paper:10.1007/s10853-022-08039-1:bcc(Ho)
tdb: tdb:HoNi-15Kar.tdb:BCC_A2, tdb:HoNi-23Ye.tdb:BCC_A2

TDB models of BCC_A2 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: BCC_A2, type code %B, sha256 177f346c93bb8894…

37: PHASE BCC_A2 %B 2 1 3 !
38: CONST BCC_A2 : HO NI : VA : !

HoNi-23Ye.tdb: BCC_A2, type code %B, sha256 56caf76fef5f3fb0…

35: PHASE BCC_A2 %B 2 1 3 !
36: CONST BCC_A2 : HO NI : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase
doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase

FCC_A1 (Ho–Ni)

Id: phase:ho-ni: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 2 of 2 calculated diagram(s): 300–2499.72 K, x(Ni) 0.99998–1
Literature: 7 values (7 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:ho-ni:fcc-a1
paper: paper:10.1007/s10853-022-08039-1:fcc(Ni), paper:10.1007/s10973-014-4189-1:(Ni), paper:10.1007/s10973-014-4189-1:fcc_A1
tdb: tdb:HoNi-15Kar.tdb:FCC_A1, tdb:HoNi-23Ye.tdb:FCC_A1

TDB models of FCC_A1 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: FCC_A1, type code %A, sha256 177f346c93bb8894…

32: PHASE FCC_A1 %A 2 1 1 !
33: CONST FCC_A1 : HO NI% : VA : !

HoNi-23Ye.tdb: FCC_A1, type code %A, sha256 56caf76fef5f3fb0…

30: PHASE FCC_A1 %A 2 1 1 !
31: CONST FCC_A1 : HO NI% : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase

HCP_A3 (Ho–Ni)

Id: phase:ho-ni: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 2 of 2 calculated diagram(s): 300–1782.44 K, x(Ni) 0–8e-05
Literature: 10 values (10 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:ho-ni:hcp-a3
paper: paper:10.1007/s10853-022-08039-1:hcp(Ho), paper:10.1007/s10973-014-4189-1:(Ho), paper:10.1007/s10973-014-4189-1:Ho
tdb: tdb:HoNi-15Kar.tdb:HCP_A3, tdb:HoNi-23Ye.tdb:HCP_A3

TDB models of HCP_A3 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HCP_A3, type code %, sha256 177f346c93bb8894…

42: PHASE HCP_A3 % 2 1 0.5 !
43: CONST HCP_A3 : HO% NI : VA : !

HoNi-23Ye.tdb: HCP_A3, type code %, sha256 56caf76fef5f3fb0…

40: PHASE HCP_A3 % 2 1 0.5 !
41: CONST HCP_A3 : HO% NI : VA : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase

HO2NI17 (Ho–Ni)

Id: phase:ho-ni:ho2ni17; 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_on_hull_entry_in_both, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ho 0.1053, Ni 0.8947
Stability: stable in 2 of 2 calculated diagram(s): 300–1561.5 K, x(Ni) 0.89474–0.89474
Literature: 20 values (20 accepted) from 2 papers
Interactive: phase registry entry

Names (6): corpus: corpus:phase:ho-ni:ho2ni17
paper: paper:10.1007/s10853-022-08039-1:Ho2Ni17, paper:10.1007/s10973-014-4189-1:Ho17Ni2, paper:10.1007/s10973-014-4189-1:Ho2Ni17
tdb: tdb:HoNi-15Kar.tdb:HO2NI17, tdb:HoNi-23Ye.tdb:HO2NI17

TDB models of HO2NI17 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HO2NI17, type code %, sha256 177f346c93bb8894…

87: PHASE HO2NI17 % 2 2 17 !
88: CONST HO2NI17 : HO : NI : !

HoNi-23Ye.tdb: HO2NI17, type code %, sha256 56caf76fef5f3fb0…

85: PHASE HO2NI17 % 2 2 17 !
86: CONST HO2NI17 : HO : NI : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2005.03.002 D. Gozzi, M. Iervolino, Thermodynamics of Ni richest intermetallics along the rare-earth series, Intermetallics 13, 1172-1183 (2005).
cited as the source of values for this phase

HO2NI7 (Ho–Ni)

Id: phase:ho-ni:ho2ni7; status assigned
Structure: Co7Gd2 · hR18 · R-3m (166); type st:co7gd2-hr18; tier B: DFT-supported (unique MP + OQMD match); confidence high
Stoichiometry: Ho 0.2222, Ni 0.7778
Stability: stable in 2 of 2 calculated diagram(s): 300–1592.57 K, x(Ni) 0.77778–0.77778
Literature: 19 values (19 accepted) from 2 papers
Interactive: phase registry entry

Names (8): corpus: corpus:phase:ho-ni:ho2ni7
mp: mp:mp-aaacpsuu
oqmd: oqmd:oqmd-1483994
paper: paper:10.1007/s10853-022-08039-1:Ho2Ni7, paper:10.1007/s10973-014-4189-1:Ho2Ni7, paper:10.1007/s10973-014-4189-1:Ho7Ni2
tdb: tdb:HoNi-15Kar.tdb:HO2NI7, tdb:HoNi-23Ye.tdb:HO2NI7

TDB models of HO2NI7 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HO2NI7, type code %, sha256 177f346c93bb8894…

77: PHASE HO2NI7 % 2 2 7 !
78: CONST HO2NI7 : HO : NI : !

HoNi-23Ye.tdb: HO2NI7, type code %, sha256 56caf76fef5f3fb0…

75: PHASE HO2NI7 % 2 2 7 !
76: CONST HO2NI7 : HO : NI : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase

HO3NI_D011 (Ho–Ni)

Id: phase:ho-ni:ho3ni-d011; status assigned
Structure: Fe3C · D0_11 · oP16 · Pnma (62); type st:d0-11-fe3c-op16; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaacprea and oqmd-30550, space group 62
Stoichiometry: Ho 0.7500, Ni 0.2500
Stability: stable in 2 of 2 calculated diagram(s): 300–1027.44 K, x(Ni) 0.25–0.25
Literature: 18 values (18 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:ho-ni:ho3ni-d011
mp: mp:mp-aaacprea
oqmd: oqmd:oqmd-30550
paper: paper:10.1007/s10853-022-08039-1:Ho3Ni, paper:10.1007/s10973-014-4189-1:Ho3Ni
tdb: tdb:HoNi-15Kar.tdb:HO3NI_D011, tdb:HoNi-23Ye.tdb:HO3NI_D011

TDB models of HO3NI_D011 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HO3NI_D011, type code %, sha256 177f346c93bb8894…

47: PHASE HO3NI_D011 % 2 3 1 !
48: CONST HO3NI_D011 : HO : NI : !

HoNi-23Ye.tdb: HO3NI_D011, type code %, sha256 56caf76fef5f3fb0…

45: PHASE HO3NI_D011 % 2 3 1 !
46: CONST HO3NI_D011 : HO : NI : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase

HO3NI2_HT (Ho–Ni)

Id: phase:ho-ni:ho3ni2-ht; status assigned
Structure: Er3Ni2 · hR15 · R-3 (148); type st:er3ni2-hr15; 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 0.6000, Ni 0.4000
Stability: stable in 2 of 2 calculated diagram(s): 1030.24–1254.92 K, x(Ni) 0.4–0.4
Literature: 15 values (15 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ho-ni:ho3ni2-ht
paper: paper:10.1007/s10853-022-08039-1:Ho3Ni2_HT, paper:10.1007/s10973-014-4189-1:Ho3Ni2_HT
tdb: tdb:HoNi-15Kar.tdb:HO3NI2_HT, tdb:HoNi-23Ye.tdb:HO3NI2_HT

TDB models of HO3NI2_HT (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HO3NI2_HT, type code %, sha256 177f346c93bb8894…

57: PHASE HO3NI2_HT % 2 3 2 !
58: CONST HO3NI2_HT : HO : NI : !

HoNi-23Ye.tdb: HO3NI2_HT, type code %, sha256 56caf76fef5f3fb0…

55: PHASE HO3NI2_HT % 2 3 2 !
56: CONST HO3NI2_HT : HO : NI : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase

HO3NI2_LT (Ho–Ni)

Id: phase:ho-ni:ho3ni2-lt; status assigned
Structure: Dy3Ni2 · mC20 · C2/m (12); type st:dy3ni2-mc20; 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 0.6000, Ni 0.4000
Stability: stable in 2 of 2 calculated diagram(s): 300–1031 K, x(Ni) 0.4–0.4
Literature: 20 values (20 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ho-ni:ho3ni2-lt
paper: paper:10.1007/s10853-022-08039-1:Ho3Ni2_LT, paper:10.1007/s10973-014-4189-1:Ho3Ni2_LT
tdb: tdb:HoNi-15Kar.tdb:HO3NI2_LT, tdb:HoNi-23Ye.tdb:HO3NI2_LT

TDB models of HO3NI2_LT (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HO3NI2_LT, type code %, sha256 177f346c93bb8894…

52: PHASE HO3NI2_LT % 2 3 2 !
53: CONST HO3NI2_LT : HO : NI : !

HoNi-23Ye.tdb: HO3NI2_LT, type code %, sha256 56caf76fef5f3fb0…

50: PHASE HO3NI2_LT % 2 3 2 !
51: CONST HO3NI2_LT : HO : NI : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase

HONI_B27 (Ho–Ni)

Id: phase:ho-ni:honi-b27; status assigned
Structure: FeB · B27 · oP8 · Pnma (62); type st:b27-feb-op8; tier A: standard phase name; confidence high
Caveat: DFT agrees: on-hull mp-aaaaarop and oqmd-18379, space group 62
Stoichiometry: Ho 0.5000, Ni 0.5000
Stability: stable in 2 of 2 calculated diagram(s): 300–1341.68 K, x(Ni) 0.5–0.5
Literature: 27 values (27 accepted) from 2 papers
Interactive: phase registry entry

Names (7): corpus: corpus:phase:ho-ni:honi-b27
mp: mp:mp-aaaaarop
oqmd: oqmd:oqmd-18379
paper: paper:10.1007/s10853-022-08039-1:HoNi, paper:10.1007/s10973-014-4189-1:HoNi
tdb: tdb:HoNi-15Kar.tdb:HONI_B27, tdb:HoNi-23Ye.tdb:HONI_B27

TDB models of HONI_B27 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HONI_B27, type code %, sha256 177f346c93bb8894…

62: PHASE HONI_B27 % 2 1 1 !
63: CONST HONI_B27 : HO : NI : !

HoNi-23Ye.tdb: HONI_B27, type code %, sha256 56caf76fef5f3fb0…

60: PHASE HONI_B27 % 2 1 1 !
61: CONST HONI_B27 : HO : NI : !

Example references (4 of 4; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase
doi:10.1016/j.intermet.2005.03.002 D. Gozzi, M. Iervolino, Thermodynamics of Ni richest intermetallics along the rare-earth series, Intermetallics 13, 1172-1183 (2005).
cited as the source of values for this phase
doi:10.1016/s0925-8388(98)00509-x Qiti Guo, Ole J Kleppa, Standard enthalpies of formation of CeNi5 and of RENi (RE=Ce, Pr, Nd, Sm, Gd, Tb, Ho, Tm and Lu), determined by high-temperature direct synthesis calorimetry, Journal of Alloys and Compounds 270, 212-217 (1998).
cited as the source of values for this phase

HONI2_C15 (Ho–Ni)

Id: phase:ho-ni:honi2-c15; status assigned
Structure: Cu2Mg · C15 · cF24 · Fd-3m (227); type st:c15-cu2mg-cf24; tier A: standard phase name; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 300–1469.69 K, x(Ni) 0.65686–0.66667
Literature: 18 values (18 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ho-ni:honi2-c15
paper: paper:10.1007/s10853-022-08039-1:HoNi2, paper:10.1007/s10973-014-4189-1:HoNi2
tdb: tdb:HoNi-15Kar.tdb:HONI2_C15, tdb:HoNi-23Ye.tdb:HONI2_C15

TDB models of HONI2_C15 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HONI2_C15, type code %, sha256 177f346c93bb8894…

67: PHASE HONI2_C15 % 2 1 2 !
68: CONST HONI2_C15 : HO : HO NI% : !

HoNi-23Ye.tdb: HONI2_C15, type code %, sha256 56caf76fef5f3fb0…

65: PHASE HONI2_C15 % 2 1 2 !
66: CONST HONI2_C15 : HO : HO NI% : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase

HONI3 (Ho–Ni)

Id: phase:ho-ni:honi3; status assigned
Structure: Ni3Pu · hR12 · R-3m (166); type st:ni3pu-hr12; 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_166_matches_2_structure_types, no_structure_token); structure as stated in the SGTE crystallographic table for this phase name and system
Stoichiometry: Ho 0.2500, Ni 0.7500
Stability: stable in 2 of 2 calculated diagram(s): 300–1560.42 K, x(Ni) 0.75–0.75
Literature: 19 values (19 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ho-ni:honi3
paper: paper:10.1007/s10853-022-08039-1:HoNi3, paper:10.1007/s10973-014-4189-1:HoNi3
tdb: tdb:HoNi-15Kar.tdb:HONI3, tdb:HoNi-23Ye.tdb:HONI3

TDB models of HONI3 (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HONI3, type code %, sha256 177f346c93bb8894…

72: PHASE HONI3 % 2 1 3 !
73: CONST HONI3 : HO : NI : !

HoNi-23Ye.tdb: HONI3, type code %, sha256 56caf76fef5f3fb0…

70: PHASE HONI3 % 2 1 3 !
71: CONST HONI3 : HO : NI : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase

HONI5_D2D (Ho–Ni)

Id: phase:ho-ni:honi5-d2d; status assigned
Structure: CaCu5 · D2_d · hP6 · P6/mmm (191); type st:d2-d-cacu5-hp6; tier A: standard phase name; confidence high
Stoichiometry: Ho 0.1667, Ni 0.8333
Stability: stable in 2 of 2 calculated diagram(s): 300–1645.82 K, x(Ni) 0.83333–0.83333
Literature: 24 values (24 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ho-ni:honi5-d2d
paper: paper:10.1007/s10853-022-08039-1:HoNi5, paper:10.1007/s10973-014-4189-1:HoNi5
tdb: tdb:HoNi-15Kar.tdb:HONI5_D2D, tdb:HoNi-23Ye.tdb:HONI5_D2D

TDB models of HONI5_D2D (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: HONI5_D2D, type code %, sha256 177f346c93bb8894…

82: PHASE HONI5_D2D % 2 1 5 !
83: CONST HONI5_D2D : HO : NI : !

HoNi-23Ye.tdb: HONI5_D2D, type code %, sha256 56caf76fef5f3fb0…

80: PHASE HONI5_D2D % 2 1 5 !
81: CONST HONI5_D2D : HO : NI : !

Example references (3 of 3; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports values for this phase
doi:10.1016/s0925-8388(98)00509-x Qiti Guo, Ole J Kleppa, Standard enthalpies of formation of CeNi5 and of RENi (RE=Ce, Pr, Nd, Sm, Gd, Tb, Ho, Tm and Lu), determined by high-temperature direct synthesis calorimetry, Journal of Alloys and Compounds 270, 212-217 (1998).
cited as the source of values for this phase

LIQUID (Ho–Ni)

Id: phase:ho-ni:liquid; status assigned
Structure: liquid; type st:liquid; liquid; confidence high
Stability: stable in 2 of 2 calculated diagram(s): 1002.77–2500 K, x(Ni) 0–1
Literature: 73 values (73 accepted) from 2 papers
Interactive: phase registry entry

Names (5): corpus: corpus:phase:ho-ni:liquid
paper: paper:10.1007/s10853-022-08039-1:L, paper:10.1007/s10973-014-4189-1:L
tdb: tdb:HoNi-15Kar.tdb:LIQUID, tdb:HoNi-23Ye.tdb:LIQUID

TDB models of LIQUID (2): PHASE and CONSTITUENT statements as written

HoNi-15Kar.tdb: LIQUID, type code %, sha256 177f346c93bb8894…

27: PHASE LIQUID:L % 1 1 !
28: CONST LIQUID:L : HO NI : !

HoNi-23Ye.tdb: LIQUID, type code %, sha256 56caf76fef5f3fb0…

25: PHASE LIQUID:L % 1 1 !
26: CONST LIQUID:L : HO NI : !

Example references (2 of 2; assessments first):

doi:10.1007/s10973-014-4189-1 S. Kardellass, C. Servant, N. Selhaoui, Thermodynamic description of the holmium–nickel system, J Therm Anal Calorim 119, 1225-1234 (2015).
assessment that models this phase; reports values for this phase
doi:10.1007/s10853-022-08039-1 Hongjian Ye, Maohua Rong, Qingrong Yao, Qing Chen, Jiang Wang, Guanghui Rao et al., Phase equilibria and thermodynamic properties in the RE-Ni (RE = rare earth metals) binary systems, J Mater Sci 58, 1260-1292 (2023).
assessment that models this phase; reports 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}
}