- High temperature-pressure processing of mixed alanate compounds
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Mixtures of light-weight hydrides and elements were investigated to increase the understanding of the chemical reactions that take place between various materials. This report details investigations we have made into mixtures that include NaAlH4, LiAlH4, MgH2, Mg2NiH4, alkali(ne) hydrides, and early third row transition metals (V, Cr, Mn). Experimental parameters such as stoichiometry, heat from ball milling versus hand milling, and varying the temperature of high pressure molten state processing were studied to examine the effects of these parameters on the reactions of the complex metal hydrides.
- Berseth, Polly A.,Pittman, Jennifer,Shanahan, Kirk,Stowe, Ashley C.,Anton, Donald,Zidan, Ragaiy
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- Synthesis of alkali metal hexahydroaluminate complexes using dimethyl ether as a reaction medium
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A novel method of preparation of hexahydroaluminate complexes M3AlH6 (M = Li, Na or K) from the corresponding alkali metal hydride and tetrahydroaluminate has been explored, using dimethyl ether (Me2O) as a solvent at near-ambient temperatures. The results are compared with those obtained using a recently established mechanochemical approach. Characterization of the products by powder X-ray diffraction revealed M3AlH6 to be formed in high yield for M = Li and Na, but not for M = K. The attempted preparation of Li2NaAlH6 and Li2KAlH6 was unsuccessful.
- Santhanam, Ranganathan,Sean McGrady
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- Thermal Decomposition of Potassium Tetrahydridoaluminate as Probed by 27Al and 39K NMR
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Polycrystalline samples of potassium tetrahydridoaluminate KAlH4 subjected to various degrees of thermolysis were studied by 27Al and 39K NMR. The contents of solid products and their compositions were determined. The major products of decomposition are aluminum metal, potassium hydride KH, and potassium hexahydridoaluminate K3AlH6. The concentration of K3AlH6 nonlinearly depends on the degree of thermolysis and is roughly two times lower than the value that follows from the reaction of decomposition. Possible reasons for this difference are discussed.
- Tarasov,Bakum,Novikov
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p. 409 - 414
(2008/10/08)
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