BaSr2I6
BaSr2I6 is a wide-gap insulating halide compound that is theoretically stable and of interest for potential use in high-performance optoelectronic applications.
About BaSr2I6
BaSr2I6 is a complex halide material characterized by its wide-gap insulating electronic structure. As a multi-cation iodide, it represents a specialized class of inorganic compounds that are increasingly explored for their potential in radiation detection and scintillation technologies.
Due to its near-hull thermodynamic stability, this material is considered a viable candidate for experimental synthesis. The significant number of reported structural variations suggests a flexible lattice architecture that can be tuned for specific physical properties.
Key Properties
Cross-validated computational properties for BaSr2I6, aggregated across 2 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 BaSr2I6. 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 BaSr2I6, 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 | 3.38 | 0.0077 | -1.818 | — |
| C2/c (No. 15) | monoclinic | 3.86 | 0.0102 | -3.586 | 4.21 |
| P-31m (No. 162) | trigonal | 3.98 | 0.0143 | -3.582 | 3.92 |
| Pbcn (No. 60) | orthorhombic | 3.95 | 0.0171 | -3.579 | 3.93 |
| P42/mnm (No. 136) | tetragonal | 3.76 | 0.0198 | -3.577 | 3.80 |
| P321 (No. 150) | trigonal | 3.83 | 0.0269 | -3.569 | 3.91 |
| C2/c (No. 15) | monoclinic | 3.60 | 0.0297 | -3.567 | 4.28 |
| P21/c (No. 14) | monoclinic | 3.44 | 0.0304 | -3.566 | 4.09 |
| P-4b2 (No. 117) | tetragonal | 3.28 | 0.0325 | -3.564 | 4.35 |
| Cmce (No. 64) | orthorhombic | 3.37 | 0.0348 | -3.562 | 4.35 |
| P21/c (No. 14) | monoclinic | 3.62 | 0.0505 | -3.546 | 4.00 |
| C2/c (No. 15) | monoclinic | 3.67 | 0.0515 | -3.545 | 3.84 |
Applications
Where BaSr2I6 is used.
Frequently Asked Questions
Common questions about BaSr2I6, answered from cross-validated data.
What is BaSr2I6?
BaSr2I6 is a wide-gap insulating halide compound that is theoretically stable and of interest for potential use in high-performance optoelectronic applications.
What is BaSr2I6 used for?
What is the band gap of BaSr2I6?
Is BaSr2I6 a metal, semiconductor, or insulator?
Is BaSr2I6 thermodynamically stable?
What is the crystal structure of BaSr2I6?
How many polymorphs of BaSr2I6 are known?
What elements does BaSr2I6 contain?
Where does the data for BaSr2I6 come from?
How It Compares
As a unique halide system, BaSr2I6 occupies a distinct niche within the broader landscape of alkaline-earth metal iodides. While it lacks direct structural siblings in this specific dataset, it serves as a representative example of how mixed-cation halide frameworks can achieve the structural stability required for advanced material development.
Data sources & attribution
- jarvis — Data from JARVIS (jarvis.nist.gov), NIST. Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020). (LicenseRef-US-Gov-PD)
- materials_project — Data from the Materials Project (materialsproject.org). Cite: Jain et al., APL Materials 1, 011002 (2013). (CC-BY-4.0)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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