La8O28Si8
La8O28Si8 is a thermodynamically stable, insulating lanthanum silicate compound known for its structural complexity.
About La8O28Si8
La8O28Si8 is a complex lanthanum silicate characterized by its wide-band-gap insulating electronic profile. As a material that resides on the convex hull, it exhibits significant thermodynamic stability, making it a robust candidate for structural and functional applications in demanding environments.
Its structural complexity is highlighted by its presence in multiple databases, reflecting a well-documented arrangement of atoms. This stability and electronic nature suggest utility in specialized ceramic or dielectric applications where insulating properties are paramount.
Key Properties
Cross-validated computational properties for La8O28Si8, aggregated across 4 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 La8O28Si8, 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/c (No. 14) | monoclinic | 4.80 | 0.0000 | -8.707 | 4.70 |
| P41 (No. 76) | tetragonal | 4.67 | 0.0086 | -8.698 | 5.11 |
| P-1 (No. 2) | triclinic | 4.56 | 0.0097 | -8.697 | 4.93 |
| P21/c (No. 14) | monoclinic | 4.38 | 0.0247 | -8.682 | 4.97 |
| P21/c (No. 14) | monoclinic | 1.99 | 0.8702 | -7.836 | 3.35 |
| — | — | — | — | — | 3.62 |
| — | — | — | — | — | 4.93 |
| — | — | — | — | — | 4.93 |
| No. 0 | unknown | — | — | — | 1.18 |
| P21/c (No. 14) | — | — | — | — | — |
| — | — | — | — | — | 3.93 |
| P21/c (No. 14) | — | — | — | — | — |
Applications
Where La8O28Si8 is used.
Frequently Asked Questions
Common questions about La8O28Si8, answered from cross-validated data.
What is La8O28Si8?
La8O28Si8 is a thermodynamically stable, insulating lanthanum silicate compound known for its structural complexity.
What is La8O28Si8 used for?
What is the band gap of La8O28Si8?
Is La8O28Si8 a metal, semiconductor, or insulator?
Is La8O28Si8 thermodynamically stable?
What is the crystal structure of La8O28Si8?
What is the density of La8O28Si8?
How many polymorphs of La8O28Si8 are known?
What elements does La8O28Si8 contain?
Where does the data for La8O28Si8 come from?
How It Compares
As a stable lanthanum silicate, this compound represents a well-defined phase within the broader landscape of rare-earth silicates. It serves as a reliable benchmark for studying the structural diversity of lanthanum-based oxide systems.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- omat24 — Data from OMat24 (Meta FAIR). Cite: Barroso-Luque et al., arXiv 2410.12771 (2024).
- cod — Data from the Crystallography Open Database. Cite: Grazulis et al., Nucleic Acids Res. 40, D420 (2012).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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