Sm2Ti2O7
Sm2Ti2O7 is a semiconducting samarium titanium oxide that is thermodynamically stable and holds potential for use in advanced functional ceramic materials.
About Sm2Ti2O7
Sm2Ti2O7 is a complex oxide composed of samarium, titanium, and oxygen. As a semiconducting material that sits near the thermodynamic hull, it represents a stable configuration that is highly relevant for researchers investigating functional ceramic oxides. Its electronic nature makes it a subject of interest for specialized applications requiring specific charge transport characteristics.
Because it is considered likely synthesizable, this compound serves as a valuable candidate for experimental validation in materials science. Its structural stability underpins its potential utility in high-performance environments where thermal and chemical robustness are required.
Key Properties
Cross-validated computational properties for Sm2Ti2O7, aggregated across 2 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 Sm2Ti2O7. 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 Sm2Ti2O7, 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. |
|---|---|---|---|---|---|
| Fd-3m (No. 227) | cubic | 2.77 | 0.0000 | -3.537 | — |
| — | — | 2.69 | 0.0006 | -3.517 | — |
| Fd-3m (No. 227) | cubic | 2.73 | 0.0120 | -9.167 | 6.29 |
Synthesis Routes
Literature-extracted synthesis procedures targeting Sm2Ti2O7.
Applications
Where Sm2Ti2O7 is used.
Frequently Asked Questions
Common questions about Sm2Ti2O7, answered from cross-validated data.
What is Sm2Ti2O7?
Sm2Ti2O7 is a semiconducting samarium titanium oxide that is thermodynamically stable and holds potential for use in advanced functional ceramic materials.
What is Sm2Ti2O7 used for?
What is the band gap of Sm2Ti2O7?
Is Sm2Ti2O7 a metal, semiconductor, or insulator?
Is Sm2Ti2O7 thermodynamically stable?
What is the crystal structure of Sm2Ti2O7?
How many polymorphs of Sm2Ti2O7 are known?
How is Sm2Ti2O7 synthesized?
What elements does Sm2Ti2O7 contain?
Where does the data for Sm2Ti2O7 come from?
How It Compares
As a unique oxide in its compositional space, Sm2Ti2O7 serves as a representative example of how rare-earth elements can be integrated into titanium-based lattices to tune electronic and structural properties, providing a baseline for future exploration of similar ternary oxide 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)
- 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)
- 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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