La4Mg2O8
La4Mg2O8 is a metastable insulating oxide containing lanthanum and magnesium that is primarily studied for its structural properties.
About La4Mg2O8
La4Mg2O8 is a complex oxide composed of lanthanum, magnesium, and oxygen. As a wide-gap insulator, it exhibits electronic characteristics typical of stable dielectric materials, though it exists in a metastable state that makes its synthesis and structural characterization a point of interest in materials science research. The compound is primarily investigated for its structural diversity, with multiple reported configurations across various databases. Its role as a metastable phase provides researchers with insights into the phase stability and structural evolution of rare-earth magnesium oxides.
Key Properties
Cross-validated computational properties for La4Mg2O8, 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 La4Mg2O8, 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. |
|---|---|---|---|---|---|
| Cmce (No. 64) | orthorhombic | 3.43 | 0.0712 | -8.036 | 6.17 |
| I4/mmm (No. 139) | tetragonal | 2.53 | 0.0873 | -8.020 | 6.27 |
| — | — | — | — | — | 5.71 |
| Fd-3m (No. 227) | — | — | — | — | — |
Applications
Where La4Mg2O8 is used.
Frequently Asked Questions
Common questions about La4Mg2O8, answered from cross-validated data.
What is La4Mg2O8?
La4Mg2O8 is a metastable insulating oxide containing lanthanum and magnesium that is primarily studied for its structural properties.
What is La4Mg2O8 used for?
What is the band gap of La4Mg2O8?
Is La4Mg2O8 a metal, semiconductor, or insulator?
Is La4Mg2O8 thermodynamically stable?
What is the crystal structure of La4Mg2O8?
What is the density of La4Mg2O8?
How many polymorphs of La4Mg2O8 are known?
What elements does La4Mg2O8 contain?
Where does the data for La4Mg2O8 come from?
How It Compares
As a unique member of the rare-earth magnesium oxide family, La4Mg2O8 represents a specialized structural arrangement that highlights the complex interplay between lanthanum and magnesium cations within an oxygen framework.
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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