Br4Nb
Niobium(IV) bromide
Niobium(IV) bromide is a dark-colored inorganic compound composed of niobium and bromine. It is primarily utilized as a precursor in chemical synthesis and as a starting material for the preparation of other niobium-based compounds in research settings.
Key Properties
Cross-validated computational properties for Br4Nb, 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of Br4Nb. 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 Br4Nb, 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/m (No. 12) | monoclinic | 0.87 | 0.0000 | -4.656 | 4.42 |
| — | — | — | — | — | 2.90 |
| No. 0 | unknown | — | — | — | 0.40 |
| — | — | — | — | — | 2.90 |
Applications
Where Br4Nb is used.
Frequently Asked Questions
Common questions about Br4Nb, answered from cross-validated data.
What is Br4Nb?
Niobium(IV) bromide is a dark-colored inorganic compound composed of niobium and bromine. It is primarily utilized as a precursor in chemical synthesis and as a starting material for the preparation of other niobium-based compounds in research settings.
What is Br4Nb used for?
What is the band gap of Br4Nb?
Is Br4Nb a metal, semiconductor, or insulator?
Is Br4Nb thermodynamically stable?
What is the crystal structure of Br4Nb?
What is the density of Br4Nb?
How many polymorphs of Br4Nb are known?
What elements does Br4Nb contain?
Where does the data for Br4Nb come from?
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- 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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