SrB4O7
Strontium tetraborate · SBO
Strontium tetraborate is a stable, insulating borate compound widely utilized for its favorable optical properties in advanced material applications.
About Strontium tetraborate
Strontium tetraborate is an insulating borate compound characterized by a wide electronic band gap. Its structural integrity and thermodynamic stability near the hull suggest it is a robust candidate for materials synthesis and long-term functional use in demanding environments.
This material is primarily valued for its optical properties, which are derived from its rigid borate framework. As a stable inorganic compound, it serves as a foundational material in the development of specialized optical components and high-performance dielectric systems.
Key Properties
Cross-validated computational properties for Strontium tetraborate, 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 SrB4O7. 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 SrB4O7, 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. |
|---|---|---|---|---|---|
| — | — | 7.54 | 0.0000 | -2.856 | — |
| Pmn21 (No. 31) | orthorhombic | 7.35 | 0.0000 | -2.810 | — |
| Pmn21 (No. 31) | orthorhombic | 7.12 | 0.0068 | -8.271 | 4.00 |
| P3 (No. 143) | trigonal | 5.18 | 0.0089 | -8.269 | 3.26 |
| Pmn21 (No. 31) | orthorhombic | — | — | — | 3.97 |
| Pmn21 (No. 31) | orthorhombic | — | — | — | 4.06 |
| Pmn21 (No. 31) | orthorhombic | — | — | — | 4.01 |
| Pmn21 (No. 31) | orthorhombic | — | — | — | 3.89 |
| Pmn21 (No. 31) | orthorhombic | — | — | — | 4.02 |
| Pmn21 (No. 31) | orthorhombic | — | — | — | 3.99 |
| P3 (No. 143) | trigonal | — | — | — | 3.35 |
Synthesis Routes
Literature-extracted synthesis procedures targeting SrB4O7.
Applications
Where Strontium tetraborate is used.
Frequently Asked Questions
Common questions about Strontium tetraborate, answered from cross-validated data.
What is SrB4O7?
Strontium tetraborate is a stable, insulating borate compound widely utilized for its favorable optical properties in advanced material applications.
What is SrB4O7 used for?
What is the band gap of SrB4O7?
Is SrB4O7 a metal, semiconductor, or insulator?
Is SrB4O7 thermodynamically stable?
What is the crystal structure of SrB4O7?
How many polymorphs of SrB4O7 are known?
How is SrB4O7 synthesized?
What elements does SrB4O7 contain?
Where does the data for SrB4O7 come from?
How It Compares
As a distinct member of the strontium borate family, this compound is recognized for its structural stability and insulating nature, positioning it as a reliable material for optical research compared to more volatile or less chemically stable borate phases.
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.
- cod — Data from the Crystallography Open Database (crystallography.net/cod/). Cite: Grazulis et al., J. Appl. Cryst. 42, 726 (2009). (CC0-1.0)
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