Br2Na2
sodium bromide · NaBr
Sodium bromide is a stable, insulating salt composed of sodium and bromine that is widely used in chemical synthesis and industrial applications.
About sodium bromide
Sodium bromide is a thermodynamically stable inorganic salt composed of sodium and bromine. As a wide-gap insulating material, it exhibits robust chemical properties that make it a foundational compound in various industrial and laboratory settings. Its stability on the convex hull ensures it remains a reliable subject for structural research.
With numerous reported structures across multiple databases, this compound is a well-documented material in solid-state chemistry. Its insulating nature and predictable behavior under standard conditions allow it to serve as a versatile precursor for synthesizing other bromine-containing materials and as a key component in chemical processing.
Key Properties
Cross-validated computational properties for sodium bromide, 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.
Reported Structures
Lowest-energy structures reported for Br2Na2, 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. |
|---|---|---|---|---|---|
| Fm-3m (No. 225) | cubic | 4.09 | 0.0000 | -3.324 | 3.29 |
| I41/amd (No. 141) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| — | — | — | — | — | 3.10 |
| Pmmn (No. 59) | — | — | — | — | — |
| P4/nmm (No. 129) | — | — | — | — | — |
| Cmcm (No. 63) | — | — | — | — | — |
| I41/amd (No. 141) | — | — | — | — | — |
| Cmcm (No. 63) | — | — | — | — | — |
| Fm-3m (No. 225) | — | — | — | — | — |
Applications
Where sodium bromide is used.
Frequently Asked Questions
Common questions about sodium bromide, answered from cross-validated data.
What is Br2Na2?
Sodium bromide is a stable, insulating salt composed of sodium and bromine that is widely used in chemical synthesis and industrial applications.
What is Br2Na2 used for?
What is the band gap of Br2Na2?
Is Br2Na2 a metal, semiconductor, or insulator?
Is Br2Na2 thermodynamically stable?
What is the crystal structure of Br2Na2?
What is the density of Br2Na2?
How many polymorphs of Br2Na2 are known?
What elements does Br2Na2 contain?
Where does the data for Br2Na2 come from?
How It Compares
As a fundamental halide, sodium bromide represents a classic example of a stable, insulating ionic solid. It serves as a benchmark for understanding the structural and electronic behavior of alkali metal halides, providing a clear reference point for the study of ionic bonding and crystal lattice stability in simpler inorganic systems.
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).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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