La4O8Sr2
La4O8Sr2 is a metastable, insulating oxide compound consisting of lanthanum, strontium, and oxygen atoms.
About La4O8Sr2
La4O8Sr2 is an insulating oxide compound composed of lanthanum, strontium, and oxygen. As a metastable phase, it represents a complex structural arrangement that highlights the intricate coordination chemistry possible within lanthanum-strontium-oxygen systems. Its electronic character as a wide-gap material suggests potential utility in dielectric applications or as a specialized substrate. The existence of multiple reported structures across databases underscores its significance in fundamental materials science studies, where researchers investigate the stability and synthesis pathways of such complex oxides. It serves as a valuable case study for understanding phase competition and structural diversity in ternary oxide systems.
Key Properties
Cross-validated computational properties for La4O8Sr2, 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 La4O8Sr2, 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 | 3.79 | 0.0488 | -8.078 | 5.14 |
| Pnma (No. 62) | orthorhombic | 3.54 | 0.0574 | -8.069 | 5.88 |
| Cmcm (No. 63) | orthorhombic | 2.79 | 0.0784 | -8.048 | 5.76 |
| — | — | — | — | — | 5.13 |
| Fd-3m (No. 227) | — | — | — | — | — |
Applications
Where La4O8Sr2 is used.
Frequently Asked Questions
Common questions about La4O8Sr2, answered from cross-validated data.
What is La4O8Sr2?
La4O8Sr2 is a metastable, insulating oxide compound consisting of lanthanum, strontium, and oxygen atoms.
What is La4O8Sr2 used for?
What is the band gap of La4O8Sr2?
Is La4O8Sr2 a metal, semiconductor, or insulator?
Is La4O8Sr2 thermodynamically stable?
What is the crystal structure of La4O8Sr2?
What is the density of La4O8Sr2?
How many polymorphs of La4O8Sr2 are known?
What elements does La4O8Sr2 contain?
Where does the data for La4O8Sr2 come from?
How It Compares
As a unique oxide phase, La4O8Sr2 occupies a distinct position in the landscape of lanthanum-strontium-based ceramics. While it lacks direct structural siblings in this specific dataset, its metastable nature distinguishes it from more common, highly stable perovskite-type oxides, making it a subject of interest for those exploring non-equilibrium materials and phase transitions.
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).
- aflow — Data from AFLOW. Cite: Curtarolo et al., Comp. Mater. Sci. 58, 218 (2012).
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