SrO
strontium oxide · strontia
Strontium oxide is a stable, insulating binary compound widely utilized as a chemical modifier in glass, ceramics, and electronic materials.
About strontium oxide
Strontium oxide is a robust, thermodynamically stable binary compound that serves as a fundamental building block in materials science. As a wide-band-gap insulator, it exhibits excellent dielectric properties and chemical resilience, making it a reliable component in high-performance material systems. Its structural versatility is highlighted by the extensive number of reported phases documented across scientific databases. Beyond its basic structural role, this compound is valued for its ability to modify the properties of glass and ceramic matrices. By influencing the thermal and optical characteristics of these materials, strontium oxide plays a critical role in the development of advanced coatings and specialized electronic components where insulating behavior is paramount.
Key Properties
Cross-validated computational properties for strontium oxide, 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 SrO. 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 SrO, 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. |
|---|---|---|---|---|---|
| Fm-3m (No. 225) | cubic | 3.40 | 0.0000 | -3.026 | — |
| Fm-3m (No. 225) | cubic | 3.28 | 0.0000 | -6.396 | 4.99 |
| — | — | 3.48 | 0.0004 | -2.945 | — |
| — | — | 3.52 | 0.0015 | -2.944 | — |
| — | — | 3.29 | 0.0016 | -2.944 | — |
| — | — | 3.29 | 0.0017 | -2.944 | — |
| — | — | 3.36 | 0.0019 | -2.944 | — |
| — | — | 3.39 | 0.0044 | -2.941 | — |
| — | — | 3.36 | 0.0046 | -2.941 | — |
| — | — | 3.08 | 0.0576 | -2.888 | — |
| P63/mmc (No. 194) | hexagonal | 2.57 | 0.0880 | -6.308 | 4.22 |
| — | — | 3.19 | 0.0913 | -2.854 | — |
Synthesis Routes
Literature-extracted synthesis procedures targeting SrO.
Applications
Where strontium oxide is used.
Patent Landscape
4 patents reference SrO or close compositional variants.
| Patent | Title | Assignee | Granted |
|---|---|---|---|
| 5641440 | Sintering aids for producing BaO.Al.sub.2 O.sub.3.2SiO.sub.2 and SrO.Al.sub. O.sub.3.2SiO.sub.2 ceramic materi | — | — |
| 3966421 | Ultra-high strength steel containing CaO, MgO, BaO or SrO having improved resistance to environmental stress c | — | — |
| 5538925 | Si.sub.3 N.sub.4 reinforced monoclinic BaO.Al.sub.2 O.sub.3 .circle-solid.2S.sub.2 and SrO.Al.sub.2 O.sub.3.2S | — | — |
| 5578534 | Method of producing Sl.sub.3 N.sub.4 reinforced monoclinic BaO.multidot.Al.sub.2 O.sub.3 .multidot.2SiO.sub.2 | — | — |
Frequently Asked Questions
Common questions about strontium oxide, answered from cross-validated data.
What is SrO?
Strontium oxide is a stable, insulating binary compound widely utilized as a chemical modifier in glass, ceramics, and electronic materials.
What is SrO used for?
What is the band gap of SrO?
Is SrO a metal, semiconductor, or insulator?
Is SrO thermodynamically stable?
What is the crystal structure of SrO?
How many polymorphs of SrO are known?
How is SrO synthesized?
What elements does SrO contain?
Where does the data for SrO come from?
How It Compares
As a foundational binary oxide, strontium oxide serves as a primary reference point for alkaline earth metal oxides, providing a stable and well-characterized insulating framework that informs the development of more complex multi-component systems.
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)
- 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)
- mpaloe — Data from MP-ALOE. Cite: Kuner et al., npj Comput. Mater. (2025), doi:10.1038/s41524-025-01834-9.
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