NaAl11O17
Beta-alumina · Sodium beta-alumina
NaAl11O17 is a stable, insulating oxide material widely utilized as a solid electrolyte for sodium-ion conduction in electrochemical devices.
About Beta-alumina
NaAl11O17 is a structurally distinct oxide known for its robust thermodynamic stability and insulating electronic character. As a member of the broader oxide family, it serves as a critical material for ion transport applications where structural integrity and chemical resistance are paramount.
This compound is widely recognized for its unique ability to facilitate rapid sodium-ion mobility within its crystal lattice. Because of this specialized behavior, it is a foundational material in the development of high-temperature energy storage systems and electrochemical sensors.
Key Properties
Cross-validated computational properties for Beta-alumina, 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 NaAl11O17, 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. |
|---|---|---|---|---|---|
| P63/mmc (No. 194) | hexagonal | 4.49 | 0.0000 | -7.728 | 3.22 |
| R3m (No. 160) | trigonal | 4.45 | 0.0024 | -7.726 | 3.22 |
| Cm (No. 8) | monoclinic | 4.41 | 0.0037 | -7.724 | 3.13 |
| P63/mmc (No. 194) | hexagonal | 4.37 | 0.0082 | -7.720 | 3.12 |
| R3m (No. 160) | Trigonal | — | — | — | 3.13 |
| R3m (No. 160) | Trigonal | — | — | — | 3.32 |
| R3m (No. 160) | Trigonal | — | — | — | 3.22 |
| R3m (No. 160) | — | — | — | — | — |
Applications
Where Beta-alumina is used.
Frequently Asked Questions
Common questions about Beta-alumina, answered from cross-validated data.
What is NaAl11O17?
NaAl11O17 is a stable, insulating oxide material widely utilized as a solid electrolyte for sodium-ion conduction in electrochemical devices.
What is NaAl11O17 used for?
What is the band gap of NaAl11O17?
Is NaAl11O17 a metal, semiconductor, or insulator?
Is NaAl11O17 thermodynamically stable?
What is the crystal structure of NaAl11O17?
What is the density of NaAl11O17?
How many polymorphs of NaAl11O17 are known?
What elements does NaAl11O17 contain?
Where does the data for NaAl11O17 come from?
How It Compares
Within the perovskite oxides class.
Unlike perovskite oxides such as BaTiO3 or LaMnO3, which are frequently studied for their ferroelectric or magnetic properties, NaAl11O17 is primarily valued for its ionic conductivity. While siblings like LaAlO3 are often utilized as substrate materials in thin-film electronics, NaAl11O17 occupies a niche as a functional electrolyte due to its specific structural framework that allows for efficient cation migration.
Related Compounds
Other Perovskite Oxides in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- mpaloe — Data from mpaloe.
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
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