KBi2F7
KBi2F7 is a metastable, wide-band-gap fluoride material studied for its structural properties within the halide perovskite class.
About KBi2F7
KBi2F7 is a complex fluoride-based material categorized within the broader family of halide perovskite-related structures. Its electronic character is defined by a wide band gap, classifying it as an insulator rather than a traditional semiconductor, which distinguishes its functional potential in solid-state systems.
As a metastable phase, this compound represents an intriguing target for materials synthesis and structural characterization. Its unique composition of potassium, bismuth, and fluorine provides a distinct chemical environment that researchers study to understand stability and structural diversity in halide-based materials.
Key Properties
Cross-validated computational properties for KBi2F7, 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 KBi2F7, 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. |
|---|---|---|---|---|---|
| P1 (No. 1) | triclinic | 4.68 | 0.0692 | -5.018 | 5.92 |
| P1 (No. 1) | triclinic | 3.58 | 0.1055 | -4.982 | 5.46 |
| P1 (No. 1) | — | — | — | — | — |
| P1 (No. 1) | Triclinic | — | — | — | 5.92 |
| P1 (No. 1) | Triclinic | — | — | — | 5.74 |
| P1 (No. 1) | Triclinic | — | — | — | 5.46 |
| P1 (No. 1) | Triclinic | — | — | — | 6.12 |
| P1 (No. 1) | Triclinic | — | — | — | 6.27 |
| P1 (No. 1) | Triclinic | — | — | — | 5.63 |
Applications
Where KBi2F7 is used.
Frequently Asked Questions
Common questions about KBi2F7, answered from cross-validated data.
What is KBi2F7?
KBi2F7 is a metastable, wide-band-gap fluoride material studied for its structural properties within the halide perovskite class.
What is KBi2F7 used for?
What is the band gap of KBi2F7?
Is KBi2F7 a metal, semiconductor, or insulator?
Is KBi2F7 thermodynamically stable?
What is the crystal structure of KBi2F7?
What is the density of KBi2F7?
How many polymorphs of KBi2F7 are known?
What elements does KBi2F7 contain?
Where does the data for KBi2F7 come from?
How It Compares
Within the halide perovskite photovoltaics class.
Within the diverse class of halide perovskites and related halides, KBi2F7 occupies a niche position compared to more conventional, semiconducting members like CsPbBr3 or CsSnI3. While many of its siblings are optimized for light-harvesting applications due to their favorable electronic properties, KBi2F7 functions primarily as a wide-gap insulator, offering a different structural template for fundamental studies compared to the highly conductive or photoactive members of the group.
Related Compounds
Other Halide Perovskite Photovoltaics in the database.
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.
Analyze KBi2F7 in the Lattice Graph platform
Polymorph comparison, confidence scoring, supply-chain risk, and patent monitoring — across 53 integrated data sources.
Explore the Platform →