Bi–Ho system

26 accepted literature values from 1 paper(s) (experimental 8, model 6, DFT 8, unspecified 4); 1 calculated phase diagram(s). 1 further extracted value(s) not accepted by the reader-agreement checks are only in the JSON/CSV.

Data: JSON · CSV · interactive explorer · interactive phase diagram · phases (7) · papers (bibliography) · Markdown

Accepted values by evidence class
Evidence class	Values
experimental	8
model	6
DFT	8
unspecified	4

Accepted values by property group
Property group	Values
invariant reaction	11
phase transition	1
formation	4
crystal structure	10

Calculated phase diagrams

Binary phase diagrams calculated with pycalphad 0.11.2 from the SGTE binary collection (Hallstedt 2025, CC BY 4.0). Evidence class: model.

Assessments with a calculated phase diagram
TDB file	Assessment	SHA-256	Links
BiHo-13Wan.tdb	J. Wang, C. Li, C. Guo, Z. Du, B. Wu, Calphad, 41, 1-5(2013). doi:10.1016/j.calphad.2013.01.003	`9736aaaf125291af70ca6339bcc9ac76fad99e4ea6a14836a060811db1e49022`	viewer · TDB · JSON

Calculated three-phase invariants (model, mole fraction of the second component)
TDB file	T (K)	Phases at the invariant
BiHo-13Wan.tdb	1696.49	BIHO_B1 (x(Ho) 0.5) + BI3HO5 (x(Ho) 0.625) + LIQUID (x(Ho) 0.68294)
BiHo-13Wan.tdb	1696.49	BIHO_B1 (x(Ho) 0.5) + BI3HO5 (x(Ho) 0.625) + LIQUID (x(Ho) 0.68299)
BiHo-13Wan.tdb	1696.49	BIHO_B1 (x(Ho) 0.5) + BI3HO5 (x(Ho) 0.625) + LIQUID (x(Ho) 0.6829)
BiHo-13Wan.tdb	1433.14	BI3HO5 (x(Ho) 0.625) + LIQUID (x(Ho) 0.82032) + HCP_A3 (x(Ho) 0.98448)
BiHo-13Wan.tdb	1433.14	BI3HO5 (x(Ho) 0.625) + LIQUID (x(Ho) 0.82033) + HCP_A3 (x(Ho) 0.98448)
BiHo-13Wan.tdb	543.95	RHOMBOHEDRAL_A7 (x(Ho) 0) + LIQUID (x(Ho) 0.00275) + BIHO_B1 (x(Ho) 0.5)
BiHo-13Wan.tdb	543.95	RHOMBOHEDRAL_A7 (x(Ho) 0) + LIQUID (x(Ho) 0.00269) + BIHO_B1 (x(Ho) 0.5)

Convex hulls: Materials Project DFT hull · OQMD DFT hull

Invariant reactions (literature)

Invariant reactions reported in the literature for the Bi–Ho system (11)
T (K)	Reaction / phases	Compositions (mole fraction)	Class	Source	Location	Quote
2048	congruent melting: L -> HoBi	L: Bi 0.5; HoBi: Bi 0.5, Ho 0.5	unspecified	[1] Wang 2013 cites Abulkhaev 1993	Table 2, p. 2, row 5 report
2048	congruent melting: L -> HoBi	L: Bi 0.5; HoBi: Bi 0.5, Ho 0.5	model	[1] Wang 2013	Table 2, p. 2, row 6 report
1693	peritectic: L + HoBi -> Ho5Bi3	L: Bi 0.315; HoBi: Bi 0.5, Ho 0.5; Ho5Bi3: Bi 0.375, Ho 0.625	model	[1] Wang 2013	Table 2, p. 2, row 4 report
1693	peritectic: L + HoBi -> Ho5Bi3	L: Bi 0.31; HoBi: Bi 0.5, Ho 0.5; Ho5Bi3: Bi 0.375, Ho 0.625	unspecified	[1] Wang 2013 cites Abulkhaev 1993	Table 2, p. 2, row 3 report
1693	peritectic: L + HoBi -> Ho5Bi3		experimental	[1] Wang 2013	p. 2 report	was formed by the peritectic reactions, LþHoBi2Ho5Bi3 at 1693 K.
1428	eutectic: L -> Ho5Bi3 + Hcp_A3 (Ho)	L: Bi 0.18; Ho5Bi3: Bi 0.375, Ho 0.625	unspecified	[1] Wang 2013 cites Abulkhaev 1993	Table 2, p. 2, row 1 report
1428	eutectic: L -> Hcp_A3 (Ho) + Ho5Bi3		experimental	[1] Wang 2013	p. 2 report	There were two eutectic reactions, L2Hcp_A3 (Ho)þ Ho5Bi3 at 1428 K and L2Rhomb (Bi)þHoBi at 544 K.
1428	eutectic: L -> Ho5Bi3 + Hcp_A3 (Ho)	L: Bi 0.179; Ho5Bi3: Bi 0.375, Ho 0.625	model	[1] Wang 2013	Table 2, p. 2, row 2 report
544	eutectic: L -> HoBi + Rhomb_A7 (Bi)	L: Bi 0.99; HoBi: Bi 0.5, Ho 0.5	unspecified	[1] Wang 2013 cites Abulkhaev 1993	Table 2, p. 2, row 7 report
544	eutectic: L -> Rhomb (Bi) + HoBi		experimental	[1] Wang 2013	p. 2 report	There were two eutectic reactions, L2Hcp_A3 (Ho)þ Ho5Bi3 at 1428 K and L2Rhomb (Bi)þHoBi at 544 K.
543.9	eutectic: L -> HoBi + Rhomb_A7 (Bi)	L: Bi 0.995; HoBi: Bi 0.5, Ho 0.5	model	[1] Wang 2013	Table 2, p. 2, row 8 report

Formation enthalpies

Literature values in kJ/mol-atom where the per-atom basis is known. DFT columns: the lowest-energy entry at the same composition (Materials Project 2026.04.13, OQMD v1.8; different energy references, never averaged), from dft_parity.json.

Enthalpies of formation, Bi–Ho system (4)
Phase	Compound	Value	Class	MP DFT (kJ/mol-atom)	OQMD DFT (kJ/mol-atom)	Source	Location
Ho5Bi3	Bi3Ho5	-71 kJ/mol-atom	model	-64.046 (mp-aaaabuof)	-66.027 (oqmd-18566)	[1] Wang 2013 cites Colinet 1984 doi	Table 5, p. 3, row 21 report
Ho5Bi3		-67.807 kJ/mol-atom	DFT			[1] Wang 2013	Table 5, p. 3, row 20 report
HoBi		-84.4462 kJ/mol-atom	DFT			[1] Wang 2013	Table 5, p. 3, row 22 report
HoBi	BiHo	-77 kJ/mol-atom	model	-79.808 (mp-aaaabhvm)	-82.775 (oqmd-1926646)	[1] Wang 2013 cites Colinet 1984 doi	Table 5, p. 3, row 23 report

Other properties

Phase transition (1)

Phase transition, Bi–Ho system
Property	Value	T (K)	Phases / composition	Class	Source	Location	Quote
Phase transition	2048 K	2048	congruent melting	experimental	[1] Wang 2013	p. 2 report	The compound HoBi melted congruently at about 2048 K.

Crystal structure (10)

Crystal structure, Bi–Ho system
Property	Value	T (K)	Phases / composition	Class	Source	Location
Lattice a	8.194 Å	0	Ho5Bi3 alloy: Ho 0.625	DFT	[1] Wang 2013	Table 3, p. 3, row 7 report
Lattice a	6.2853 Å	0	HoBi alloy: Ho 0.5	DFT	[1] Wang 2013	Table 3, p. 3, row 9 report
Lattice a	8.128 Å	298.15	Ho5Bi3 alloy: Ho 0.625	experimental	[1] Wang 2013 cites Drzyzga 2001 doi	Table 3, p. 3, row 8 report
Lattice a	6.2291 Å	298.15	HoBi alloy: Ho 0.5	experimental	[1] Wang 2013 cites Yoshihara 1975 doi	Table 3, p. 3, row 10 report
Lattice b	9.469 Å	0	Ho5Bi3 alloy: Ho 0.625	DFT	[1] Wang 2013	Table 3, p. 3, row 7 report
Lattice b	9.385 Å	298.15	Ho5Bi3 alloy: Ho 0.625	experimental	[1] Wang 2013 cites Drzyzga 2001 doi	Table 3, p. 3, row 8 report
Lattice c	11.942 Å	0	Ho5Bi3 alloy: Ho 0.625	DFT	[1] Wang 2013	Table 3, p. 3, row 7 report
Lattice c	11.874 Å	298.15	Ho5Bi3 alloy: Ho 0.625	experimental	[1] Wang 2013 cites Drzyzga 2001 doi	Table 3, p. 3, row 8 report
Molar volume printed: V0	926.568 Å3	0	Ho5Bi3 alloy: Ho 0.625	DFT	[1] Wang 2013	Table 4, p. 3, row 4 report
Molar volume printed: V0	62.075 Å3	0	HoBi alloy: Ho 0.5	DFT	[1] Wang 2013	Table 4, p. 3, row 5 report

Sources

Reporting papers the values were read from (a value cited from another work names that work in its row).

Jinsan Wang, Changrong Li, Cuiping Guo, Zhenmin Du, Bo Wu, Thermodynamic assessment of the Gd–Bi and the Ho–Bi systems, Calphad 41, 1-5 (2013). doi:10.1016/j.calphad.2013.01.003

Please cite

R. Arróyave, J. Saal, D. Shin, ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature (version 2026.10; Version 1, machine-extracted), Zenodo (2026). doi:10.5281/zenodo.23735569
R. Arróyave, J. Saal, D. Shin, ORCHID-Diagrams: calculated binary phase diagrams (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735859
R. Arróyave, J. Saal, D. Shin, ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD) (version 2026.10), Zenodo (2026). doi:10.5281/zenodo.23735891
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 the original source of every value you use (paper_citation / paper_doi, and cited_dois for values the paper cites from earlier work); 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). 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_literature_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Values: thermodynamic and phase-equilibrium values read from the literature}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735569},
  url       = {https://doi.org/10.5281/zenodo.23735569},
  note      = {Version 1, machine-extracted}
}

@misc{orchid_phase_diagrams_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Diagrams: calculated binary phase diagrams}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735859},
  url       = {https://doi.org/10.5281/zenodo.23735859}
}

@misc{orchid_hulls_2026,
  author    = {Arr{\'o}yave, Raymundo and Saal, James and Shin, Dongwon},
  title     = {{ORCHID-Hulls: binary convex hulls (Materials Project, OQMD, assessed CALPHAD)}},
  version   = {2026.10},
  publisher = {Zenodo},
  year      = {2026},
  doi       = {10.5281/zenodo.23735891},
  url       = {https://doi.org/10.5281/zenodo.23735891}
}

@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}
}