HoNi2
HoNi2 is a stable metallic intermetallic compound formed from holmium and nickel.
About HoNi2
HoNi2 is a metallic intermetallic compound composed of holmium and nickel. As a thermodynamically stable phase located on the convex hull, it represents a robust structural arrangement of these elements, making it a reliable subject for fundamental solid-state studies. Its metallic nature is defined by the absence of a band gap, facilitating efficient electron transport characteristic of rare-earth transition metal alloys. The compound has been extensively documented across multiple structural databases, reflecting its significance in the study of intermetallic phase stability. This material serves as a key reference point for understanding the interactions between lanthanide magnetism and transition metal electronic behavior in binary systems.
Key Properties
Cross-validated computational properties for HoNi2, aggregated across 5 databases.
Band GapEnergy needed to move an electron from the valence band to the conduction band. Lower or zero values tend to behave more metallic; larger gaps are more insulating or semiconducting.
Energy Above HullThermodynamic distance from the most stable set of competing phases. 0 eV/atom is on the convex hull; small positive values may still be experimentally accessible.
StabilityA plain-language summary of the best reported energy-above-hull result. It reflects whether the lowest-energy structure is on, near, or far from the stability hull.
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of HoNi2. Tight agreement means computed properties can be trusted without re-running calculations.
Agreement ScoreA normalized confidence score summarizing how closely independent DFT databases agree. Higher scores mean tighter cross-source agreement.
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
Reported Structures
Lowest-energy structures reported for HoNi2, ranked by energy above hull.
| Space GroupSymmetry classification of the crystal arrangement. The number is the international space-group index. | Crystal SystemBroad lattice family, such as cubic, tetragonal, monoclinic, or triclinic, derived from unit-cell symmetry. | Band Gap (eV)Electronic gap calculated for this specific reported structure, measured in electronvolts. | E above hull (eV/atom)Thermodynamic distance from the convex hull for this structure, normalized per atom. Lower is generally more stable. | E/atom (eV)Computed total energy normalized per atom. Use energy above hull, not this value alone, when comparing stability. | Density (g/cm³)Mass per relaxed crystal volume, reported in grams per cubic centimeter. |
|---|---|---|---|---|---|
| Fd-3m (No. 227) | cubic | 0.00 | 0.0000 | -5.845 | 10.63 |
| Fd-3m (No. 227) | — | — | — | — | — |
| Fd-3m (No. 227) | — | — | — | — | — |
| — | — | — | — | — | 9.77 |
| No. 0 | unknown | — | — | — | 5.76 |
| No. 0 | unknown | — | — | — | 5.74 |
Applications
Where HoNi2 is used.
Frequently Asked Questions
Common questions about HoNi2, answered from cross-validated data.
What is HoNi2?
HoNi2 is a stable metallic intermetallic compound formed from holmium and nickel.
What is HoNi2 used for?
What is the band gap of HoNi2?
Is HoNi2 a metal, semiconductor, or insulator?
Is HoNi2 thermodynamically stable?
What is the crystal structure of HoNi2?
What is the density of HoNi2?
How many polymorphs of HoNi2 are known?
What elements does HoNi2 contain?
Where does the data for HoNi2 come from?
How It Compares
As a thermodynamically stable intermetallic, HoNi2 occupies a well-defined position in the landscape of binary rare-earth nickel alloys. It serves as a foundational example of how holmium and nickel organize into stable crystalline structures, providing a baseline for researchers investigating the broader class of metallic intermetallic compounds.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- nomad — Data from NOMAD. Cite: Draxl & Scheffler, J. Phys. Mater. 2, 036001 (2019).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
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