Bi4Br2O9Te2
Bi4Br2O9Te2 is a metastable semiconducting compound containing bismuth, bromine, oxygen, and tellurium.
About Bi4Br2O9Te2
Bi4Br2O9Te2 is a complex quaternary compound composed of bismuth, bromine, oxygen, and tellurium. As a semiconducting material, it exhibits electronic properties that make it a subject of interest for researchers investigating specialized solid-state systems. Its composition suggests a unique structural arrangement that warrants further exploration in materials science.
Due to its metastable nature, this compound represents a delicate balance of chemical components that can be sensitive to synthesis conditions. It is currently documented across multiple databases, reflecting its status as a niche material that provides insight into the diverse phase space of bismuth-based oxyhalides and tellurides.
Key Properties
Cross-validated computational properties for Bi4Br2O9Te2, 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 Bi4Br2O9Te2, 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. |
|---|---|---|---|---|---|
| P4mm (No. 99) | tetragonal | 1.83 | 0.0456 | -5.645 | 7.60 |
| P4mm (No. 99) | tetragonal | 0.86 | 0.1678 | -5.523 | 7.28 |
| P4mm (No. 99) | — | — | — | — | — |
| — | — | — | — | — | 6.57 |
Frequently Asked Questions
Common questions about Bi4Br2O9Te2, answered from cross-validated data.
What is Bi4Br2O9Te2?
Bi4Br2O9Te2 is a metastable semiconducting compound containing bismuth, bromine, oxygen, and tellurium.
What is the band gap of Bi4Br2O9Te2?
Is Bi4Br2O9Te2 a metal, semiconductor, or insulator?
Is Bi4Br2O9Te2 thermodynamically stable?
What is the crystal structure of Bi4Br2O9Te2?
What is the density of Bi4Br2O9Te2?
How many polymorphs of Bi4Br2O9Te2 are known?
What elements does Bi4Br2O9Te2 contain?
Where does the data for Bi4Br2O9Te2 come from?
How It Compares
As a unique quaternary phase, Bi4Br2O9Te2 occupies a distinct position within the landscape of complex bismuth-based materials. While it lacks direct structural siblings in this specific grouping, it serves as an important example of how combining heavy p-block elements with halides and oxygen can yield metastable semiconducting phases with complex coordination environments.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
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