Sr2TiO4
strontium titanate · strontium orthotitanate
Sr2TiO4 is a stable, layered perovskite oxide semiconductor used in materials research for its unique electronic and structural properties.
About strontium titanate
Sr2TiO4 is a thermodynamically stable member of the perovskite oxide family, characterized by its semiconducting electronic nature. Its structural integrity and well-defined composition make it a significant subject of research in materials science, supported by multiple documented structural configurations.
This compound plays a vital role in the development of functional oxides, where its stable lattice framework allows for precise tuning of electronic properties. It is primarily utilized in advanced material research, particularly in the study of thin-film growth and potential catalytic or optoelectronic applications.
Key Properties
Cross-validated computational properties for strontium titanate, 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 Sr2TiO4, 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. |
|---|---|---|---|---|---|
| I4/mmm (No. 139) | tetragonal | 1.91 | 0.0000 | -7.882 | 4.99 |
| I4/mmm (No. 139) | Tetragonal | — | — | — | 4.87 |
| I4/mmm (No. 139) | Tetragonal | — | — | — | 5.09 |
| I4/mmm (No. 139) | Tetragonal | — | — | — | 4.98 |
| I4/mmm (No. 139) | — | — | — | — | — |
Applications
Where strontium titanate is used.
Frequently Asked Questions
Common questions about strontium titanate, answered from cross-validated data.
What is Sr2TiO4?
Sr2TiO4 is a stable, layered perovskite oxide semiconductor used in materials research for its unique electronic and structural properties.
What is Sr2TiO4 used for?
What is the band gap of Sr2TiO4?
Is Sr2TiO4 a metal, semiconductor, or insulator?
Is Sr2TiO4 thermodynamically stable?
What is the crystal structure of Sr2TiO4?
What is the density of Sr2TiO4?
How many polymorphs of Sr2TiO4 are known?
What elements does Sr2TiO4 contain?
Where does the data for Sr2TiO4 come from?
How It Compares
Within the perovskite oxides class.
As a Ruddlesden-Popper phase, Sr2TiO4 occupies a distinct structural niche compared to the cubic perovskite BaTiO3. While BaTiO3 is widely recognized for its ferroelectric properties, Sr2TiO4 offers a layered structural alternative that facilitates different charge transport mechanisms and surface interactions, distinguishing it from the more complex magnetic perovskites like LaMnO3 or LaFeO3.
Related Compounds
Other Perovskite Oxides in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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