SrTiO3
Strontium titanate · ST, STO
Strontium titanate is a stable, semiconducting perovskite oxide widely used as a substrate in thin-film electronics and optical components.
About Strontium titanate
Strontium titanate is a prominent member of the perovskite oxide family, characterized by its robust thermodynamic stability. As a semiconducting material, it serves as a foundational building block in condensed matter physics and materials science research due to its structural versatility and reliable performance. Its ability to host various dopants makes it highly adaptable for complex electronic systems. The compound is widely utilized in the development of high-k dielectrics, thin-film substrates, and optoelectronic devices. Its structural integrity under diverse conditions ensures its continued relevance in both academic studies and industrial technological 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.
Cross-Source DFT Agreement
How well independent DFT databases agree on the thermodynamics of SrTiO3. 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 SrTiO3, 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. |
|---|---|---|---|---|---|
| — | — | 2.01 | 0.0000 | -3.354 | — |
| I4/mcm (No. 140) | tetragonal | 1.91 | 0.0000 | -3.419 | — |
| I4/mcm (No. 140) | tetragonal | 1.91 | 0.0000 | -3.419 | — |
| I4/mcm (No. 140) | tetragonal | 1.86 | 0.0000 | -8.438 | 5.09 |
| I4/mcm (No. 140) | tetragonal | 1.79 | 0.0001 | -8.438 | 5.09 |
| — | — | 2.01 | 0.0003 | -3.354 | — |
| — | — | 2.02 | 0.0003 | -3.354 | — |
| Pm-3m (No. 221) | cubic | 1.77 | 0.0005 | -8.438 | 5.09 |
| — | — | 1.94 | 0.0007 | -3.353 | — |
| — | — | 1.71 | 0.0008 | -3.353 | — |
| — | — | 1.96 | 0.0011 | -3.353 | — |
| Pm-3m (No. 221) | cubic | 1.81 | 0.0013 | -3.417 | — |
Synthesis Routes
Literature-extracted synthesis procedures targeting SrTiO3.
Applications
Where Strontium titanate is used.
Patent Landscape
8 patents reference SrTiO3 or close compositional variants.
| Patent | Title | Assignee | Granted |
|---|---|---|---|
| 7714695 | Method for manufacturing SrTiO3 series varistor using grain boundary segregation | — | — |
| 6292355 | SrTiO3-based grain boundary barrier layer capacitor | — | — |
| 6514476 | Anisotropically shaped SrTiO3 single crystal particles | — | — |
| 8361550 | Method for forming SrTiO3 film and storage medium | — | — |
| 6790278 | Method for preparing low-resistant p-type SrTiO3 | — | — |
| 4419310 | SrTiO.sub.3 barrier layer capacitor | — | — |
| 7604892 | Y and Nb-doped SrTiO3 as a mixed conducting anode for solid oxide fuel cells | — | — |
| 7816282 | Method for forming SrTiO3 film | — | — |
Frequently Asked Questions
Common questions about Strontium titanate, answered from cross-validated data.
What is SrTiO3?
Strontium titanate is a stable, semiconducting perovskite oxide widely used as a substrate in thin-film electronics and optical components.
What is SrTiO3 used for?
What is the band gap of SrTiO3?
Is SrTiO3 a metal, semiconductor, or insulator?
Is SrTiO3 thermodynamically stable?
What is the crystal structure of SrTiO3?
What is the density of SrTiO3?
How many polymorphs of SrTiO3 are known?
How is SrTiO3 synthesized?
What elements does SrTiO3 contain?
Where does the data for SrTiO3 come from?
How It Compares
Within the perovskite oxides class.
Within the diverse group of perovskite oxides, SrTiO3 stands out as a highly stable and well-characterized material compared to more complex or magnetic counterparts like LaMnO3 or BiFeO3. While materials such as BaTiO3 are frequently utilized for their strong ferroelectric responses, SrTiO3 is often preferred as a high-quality substrate for epitaxial growth due to its excellent lattice matching and consistent semiconducting behavior, making it a cornerstone of modern thin-film engineering.
Related Compounds
Other Perovskite Oxides in the database.
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)
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