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The structure of magnesium alanate.
Maximilian Fichtner1, Jens Engel, Olaf Fuhr
1Karlsruhe Research Center, Institute of Nanotechnology, POB 3640, D-76021 Karlsruhe, Germany. fichtner@int.fzk.de
Inorganic Chemistry
|October 28, 2003
Summary
Magnesium alanate, Mg(AlH4)2, was synthesized as a nanocrystalline powder. Quantum chemical calculations confirmed its CdI2 layer structure, matching experimental X-ray diffraction data.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Computational Chemistry
Background:
- Magnesium alanate (Mg(AlH4)2) is a material of interest for hydrogen storage.
- Understanding its crystal structure is crucial for optimizing its properties.
- Previous structural information was limited.
Purpose of the Study:
- To determine the crystal structure of nanocrystalline magnesium alanate.
- To validate computational methods against experimental data.
- To elucidate the atomic arrangement in Mg(AlH4)2.
Main Methods:
- Synthesis of Mg(AlH4)2 via metathesis reaction.
- Fourier-transform infrared (FTIR) spectroscopy for initial structure estimation.
- Density functional theory (DFT) calculations for atomic positions.
- Simulation of X-ray powder diffraction (XRD) patterns.
Main Results:
- Mg(AlH4)2 was successfully produced as a nanocrystalline powder.
- DFT calculations predicted atomic positions consistent with a trigonal unit cell.
- Simulated XRD patterns matched experimental data.
- The structure was identified as a CdI2 layer type.
Conclusions:
- Magnesium alanate crystallizes in a CdI2 layer structure.
- Mg atoms occupy Cd sites, and AlH4 tetrahedra occupy iodine sites.
- The combined experimental and computational approach accurately determined the crystal structure.