KAlH4
Potassium alanate · Potassium tetrahydroaluminate
Potassium alanate is a complex metal hydride used primarily as a chemical reagent in organic synthesis. It serves as a powerful reducing agent capable of converting various functional groups and is studied for its potential in hydrogen storage applications.
Key Properties
Cross-validated computational properties for Potassium alanate, 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 KAlH4, 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. |
|---|---|---|---|---|---|
| Pnma (No. 62) | orthorhombic | 5.07 | 0.0000 | -4.704 | 1.28 |
| I41/a (No. 88) | tetragonal | 4.80 | 0.0048 | -4.700 | 1.31 |
| Pnma (No. 62) | — | — | — | — | — |
| I41/a (No. 88) | — | — | — | — | — |
| I41/a (No. 88) | Tetragonal | — | — | — | 1.28 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 1.22 |
| I41/a (No. 88) | Tetragonal | — | — | — | 1.27 |
| I41/a (No. 88) | Tetragonal | — | — | — | 1.28 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 1.24 |
| Pnma (No. 62) | Orthorhombic | — | — | — | 1.24 |
Applications
Where Potassium alanate is used.
Frequently Asked Questions
Common questions about Potassium alanate, answered from cross-validated data.
What is KAlH4?
Potassium alanate is a complex metal hydride used primarily as a chemical reagent in organic synthesis. It serves as a powerful reducing agent capable of converting various functional groups and is studied for its potential in hydrogen storage applications.
What is KAlH4 used for?
What is the band gap of KAlH4?
Is KAlH4 a metal, semiconductor, or insulator?
Is KAlH4 thermodynamically stable?
What is the crystal structure of KAlH4?
What is the density of KAlH4?
How many polymorphs of KAlH4 are known?
What elements does KAlH4 contain?
Where does the data for KAlH4 come from?
Related Compounds
Other Hydrogen Storage Hydrides in the database.
Data sources & attribution
- materials_project — Data from the Materials Project. Cite: Jain et al., APL Materials 1, 011002 (2013).
- jarvis — Data from JARVIS (NIST). Cite: Choudhary et al., npj Comp. Mater. 6, 173 (2020).
- mpaloe — Data from mpaloe.
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