VHO
VHO is a semiconducting vanadium-based compound that exists in a metastable state.
About VHO
VHO is a semiconducting compound composed of vanadium, hydrogen, and oxygen. As a material that sits above the thermodynamic hull, it is characterized by its inherent instability under standard conditions, representing a metastable phase of interest for fundamental research into vanadium-oxygen-hydrogen systems. Its existence is documented across multiple structural databases, highlighting its role as a subject of computational investigation. While it lacks the stability of more common binary oxides, its unique electronic nature makes it a notable entry for those studying complex phase spaces in transition metal chemistry.
Key Properties
Cross-validated computational properties for VHO, aggregated across 3 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.
Reported Structures
Lowest-energy structures reported for VHO, 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. |
|---|---|---|---|---|---|
| Pnnm (No. 58) | orthorhombic | 1.40 | 0.1251 | -6.705 | 4.25 |
| C2/m (No. 12) | Monoclinic | — | — | — | 2.82 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.01 |
| C2/m (No. 12) | Monoclinic | — | — | — | 3.71 |
| P-6m2 (No. 187) | — | — | — | — | — |
Frequently Asked Questions
Common questions about VHO, answered from cross-validated data.
What is VHO?
VHO is a semiconducting vanadium-based compound that exists in a metastable state.
What is the band gap of VHO?
Is VHO a metal, semiconductor, or insulator?
Is VHO thermodynamically stable?
What is the crystal structure of VHO?
What is the density of VHO?
How many polymorphs of VHO are known?
What elements does VHO contain?
Where does the data for VHO come from?
How It Compares
As a unique phase within the vanadium-hydrogen-oxygen system, VHO serves as a distinct point of study for researchers exploring metastable inorganic compounds. Without established siblings in this specific compositional class, it stands as a singular example of how vanadium can coordinate with hydrogen and oxygen to form semiconducting structures that challenge conventional thermodynamic stability expectations.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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