La2W2O9
La2W2O9 is a wide-band-gap insulating ternary oxide that is considered a viable candidate for experimental synthesis due to its favorable thermodynamic stability.
About La2W2O9
La2W2O9 is a complex oxide composed of lanthanum, tungsten, and oxygen. As a wide-band-gap insulator, it exhibits electronic properties characteristic of stable dielectric materials, making it a subject of interest for fundamental solid-state studies.
Its position near the thermodynamic hull suggests that this compound is likely synthesizable under appropriate experimental conditions. The existence of multiple reported structural configurations highlights its versatility and structural complexity within the landscape of ternary metal oxides.
Key Properties
Cross-validated computational properties for La2W2O9, 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 La2W2O9, 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. |
|---|---|---|---|---|---|
| P-1 (No. 2) | triclinic | 3.45 | 0.0162 | -9.123 | 7.46 |
| No. 0 | unknown | — | — | — | 3.77 |
| P-1 (No. 2) | — | — | — | — | — |
Synthesis Routes
Literature-extracted synthesis procedures targeting La2W2O9.
Applications
Where La2W2O9 is used.
Frequently Asked Questions
Common questions about La2W2O9, answered from cross-validated data.
What is La2W2O9?
La2W2O9 is a wide-band-gap insulating ternary oxide that is considered a viable candidate for experimental synthesis due to its favorable thermodynamic stability.
What is La2W2O9 used for?
What is the band gap of La2W2O9?
Is La2W2O9 a metal, semiconductor, or insulator?
Is La2W2O9 thermodynamically stable?
What is the crystal structure of La2W2O9?
What is the density of La2W2O9?
How many polymorphs of La2W2O9 are known?
How is La2W2O9 synthesized?
What elements does La2W2O9 contain?
Where does the data for La2W2O9 come from?
How It Compares
As a unique ternary oxide, La2W2O9 serves as an important reference point for studying the interplay between lanthanum and tungsten in oxygen-rich environments. It occupies a distinct niche in materials science, providing a baseline for understanding the structural stability and electronic behavior of similar rare-earth tungstate systems.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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