Sr2Al2SiO7
strontium gehlenite · strontium-gehlenite
Sr2Al2SiO7 is a stable, insulating strontium aluminosilicate used primarily as a structural host material in advanced ceramics.
About strontium gehlenite
Sr2Al2SiO7 is a thermodynamically stable aluminosilicate that exhibits insulating electronic behavior. As a member of the melilite group, its structural framework is defined by the arrangement of aluminum, silicon, and strontium atoms, which contributes to its robust stability profile.
This compound is of significant interest in materials science due to its structural versatility and potential for hosting luminescent dopants. Its stable nature makes it a reliable candidate for high-temperature applications and as a host lattice in advanced optical ceramics.
Key Properties
Cross-validated computational properties for strontium gehlenite, 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 Sr2Al2SiO7. 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 Sr2Al2SiO7, 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. |
|---|---|---|---|---|---|
| P21 (No. 4) | monoclinic | 4.27 | 0.0000 | -3.318 | — |
| P21 (No. 4) | monoclinic | 4.21 | 0.0000 | -7.717 | 3.67 |
| — | — | 4.59 | 0.0064 | -3.285 | — |
| P21 (No. 4) | monoclinic | — | — | — | 3.67 |
| P21 (No. 4) | monoclinic | — | — | — | 3.87 |
| P21 (No. 4) | monoclinic | — | — | — | 3.76 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Sr2Al2SiO7.
Applications
Where strontium gehlenite is used.
Frequently Asked Questions
Common questions about strontium gehlenite, answered from cross-validated data.
What is Sr2Al2SiO7?
Sr2Al2SiO7 is a stable, insulating strontium aluminosilicate used primarily as a structural host material in advanced ceramics.
What is Sr2Al2SiO7 used for?
What is the band gap of Sr2Al2SiO7?
Is Sr2Al2SiO7 a metal, semiconductor, or insulator?
Is Sr2Al2SiO7 thermodynamically stable?
What is the crystal structure of Sr2Al2SiO7?
How many polymorphs of Sr2Al2SiO7 are known?
How is Sr2Al2SiO7 synthesized?
What elements does Sr2Al2SiO7 contain?
Where does the data for Sr2Al2SiO7 come from?
How It Compares
Within the aluminosilicates and zeolite frameworks class.
Within the diverse class of aluminosilicates, Sr2Al2SiO7 is structurally analogous to Ca2Al2SiO7, sharing the same gehlenite-type framework. While other members like the complex Mg2Al4Si5O18 or the simple Al2SiO5 polymorphs exhibit vastly different crystal symmetries and thermodynamic behaviors, Sr2Al2SiO7 remains a distinct, stable representative of the alkaline-earth aluminosilicate family.
Related Compounds
Other Aluminosilicates and Zeolite Frameworks in the database.
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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