SrF2
strontium fluoride · strontian fluorite
Strontium fluoride is a stable, transparent insulating material primarily used for its specialized optical properties in advanced manufacturing.
About strontium fluoride
Strontium fluoride is a thermodynamically stable inorganic compound that exhibits characteristic wide-band-gap insulating behavior. Its structural integrity and chemical robustness make it a reliable material for high-performance applications requiring specific dielectric or optical properties.
Due to its favorable electronic structure and stability, this compound is widely utilized in the production of optical components, including high-quality lenses and windows. It serves as a critical material in thin-film deposition processes where transparency across a broad spectrum is essential.
Key Properties
Cross-validated computational properties for strontium fluoride, 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 SrF2. 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 SrF2, 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. |
|---|---|---|---|---|---|
| — | — | 7.43 | 0.0000 | -4.206 | — |
| Pnma (No. 62) | orthorhombic | 7.24 | 0.0000 | -4.161 | — |
| Fm-3m (No. 225) | cubic | 6.75 | 0.0000 | -6.070 | 4.28 |
| Fm-3m (No. 225) | cubic | 7.08 | 0.0032 | -4.157 | — |
| Fm-3m (No. 225) | cubic | 7.07 | 0.0035 | -4.157 | — |
| — | — | 7.40 | 0.0039 | -4.202 | — |
| — | — | 7.38 | 0.0049 | -4.201 | — |
| — | — | 7.34 | 0.0052 | -4.201 | — |
| Pnma (No. 62) | orthorhombic | 7.01 | 0.0267 | -6.043 | 4.73 |
| — | — | 7.23 | 0.0617 | -4.144 | — |
| Pnma (No. 62) | orthorhombic | 6.35 | 0.0646 | -6.005 | 3.78 |
| — | — | 7.99 | 0.0872 | -4.119 | — |
Applications
Where strontium fluoride is used.
Frequently Asked Questions
Common questions about strontium fluoride, answered from cross-validated data.
What is SrF2?
Strontium fluoride is a stable, transparent insulating material primarily used for its specialized optical properties in advanced manufacturing.
What is SrF2 used for?
What is the band gap of SrF2?
Is SrF2 a metal, semiconductor, or insulator?
Is SrF2 thermodynamically stable?
What is the crystal structure of SrF2?
What is the density of SrF2?
How many polymorphs of SrF2 are known?
What elements does SrF2 contain?
Where does the data for SrF2 come from?
How It Compares
As a prominent fluoride compound, strontium fluoride represents a foundational material in its chemical class, often serving as a benchmark for stability and optical performance compared to other alkaline earth metal halides.
Data sources & attribution
- oqmd — Data from the OQMD (oqmd.org). Cite: Saal et al., JOM 65, 1501 (2013); Kirklin et al., npj Comp. Mater. 1, 15010 (2015). (CC-BY-4.0)
- 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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