BiO2
Bismuth dioxide is a binary oxide of bismuth that exists as an inorganic compound. It is primarily studied for its potential roles in electrochemical applications and as a precursor in the synthesis of more complex bismuth-based materials.
BiO
Overview
Key Properties
Cross-validated computational properties for BiO2, 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.
0.03–1.16 eV
Range across DFT structures
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.
0.000 eV/atom
Best (lowest) across sources
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.
On hull (stable)
3 DFT sources
StructuresCount of reported calculated crystal structures for this formula, including alternate polymorphs, source databases, and observed space groups.
263
5 databases, 37 space groups
Validation
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of BiO2. 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.
1.00 / 1.00
Trust tier: high
Hull SpreadDifference between the highest and lowest energy-above-hull values reported by comparable sources. Smaller spread means less thermodynamic disagreement.
0.000 eV
EAH spread across sources
Sources ComparedNumber and names of computational sources with comparable entries for this formula.
3
jarvis, materials_project, nomad
Space Group ConsensusWhether independent sources predict the same crystal symmetry for the lowest-energy structure.
All match
Crystallography
Reported Structures
Lowest-energy structures reported for BiO2, 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. |
|---|---|---|---|---|---|
| C2/c (No. 15) | monoclinic | 1.16 | 0.0000 | -6.055 | 9.36 |
| Imma (No. 74) | orthorhombic | 0.00 | 0.0207 | -6.034 | 8.38 |
| R3m (No. 160) | trigonal | 0.00 | 0.0716 | -5.983 | 9.19 |
| P42/mnm (No. 136) | tetragonal | 0.00 | 0.0724 | -5.983 | 8.66 |
| Pmc21 (No. 26) | orthorhombic | 0.52 | 0.0791 | -5.976 | 7.28 |
| P1 (No. 1) | triclinic | 0.03 | 0.0859 | -5.969 | 8.16 |
| I4/m (No. 87) | tetragonal | 0.00 | 0.0897 | -5.965 | 6.54 |
| C2/c (No. 15) | monoclinic | 0.00 | 0.1019 | -5.953 | 7.59 |
| Fm-3m (No. 225) | cubic | 0.00 | 0.1020 | -5.953 | 9.56 |
| Cm (No. 8) | monoclinic | 0.42 | 0.1574 | -5.898 | 7.18 |
| Cmcm (No. 63) | orthorhombic | 0.00 | 0.1670 | -5.888 | 7.15 |
| P1 (No. 1) | triclinic | 0.35 | 0.1738 | -5.881 | 6.67 |
Uses
Applications
Where BiO2 is used.
Electrochemical researchMaterials science synthesisCatalysis studies
Reference
Frequently Asked Questions
Common questions about BiO2, answered from cross-validated data.
What is BiO2?
Bismuth dioxide is a binary oxide of bismuth that exists as an inorganic compound. It is primarily studied for its potential roles in electrochemical applications and as a precursor in the synthesis of more complex bismuth-based materials.
More questions
What is BiO2 used for?
BiO2 is used in electrochemical research, materials science synthesis, and catalysis studies.
What is the band gap of BiO2?
BiO2 has a DFT-computed band gap of 0.03–1.16 eV across 263 reported structures.
Is BiO2 a metal, semiconductor, or insulator?
With a band gap up to 1.16 eV it is a semiconductor.
Is BiO2 thermodynamically stable?
Yes — BiO2 sits on the convex hull (energy above hull 0 eV/atom), i.e. on hull (stable).
What is the crystal structure of BiO2?
The lowest-energy reported polymorph of BiO2 is monoclinic symmetry, space group C2/c (No. 15).
What is the density of BiO2?
The computed density of the ground-state structure of BiO2 is 9.36 g/cm³.
How many polymorphs of BiO2 are known?
263 structures of BiO2 are reported across 5 databases, spanning 37 distinct space groups.
What elements does BiO2 contain?
BiO2 contains Bi and O (2 elements).
Where does the data for BiO2 come from?
BiO2 data is cross-referenced from materials_project, jarvis, mpaloe.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- mpaloe — Data from mpaloe.
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