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| Title: | SYNTHESIS AND MODIFICATION OF LIGHT METAL AND COMPLEX HYDRIDES BY HIGH-ENERGY BALL MILLING | |
| DOI No: | 10.1142/9789812838025_0013 | |
| Source: | MATERIALS ISSUES IN A HYDROGEN ECONOMY (pp 138-143) | |
| Author(s): | I. LLAMAS-JANSA
IFW Dresden, Institute for Metallic Materials, P.O. Box 270016, D-01171 Dresden, Germany C. RONGEAT IFW Dresden, Institute for Metallic Materials, P.O. Box 270016, D-01171 Dresden, Germany S. DOPPIU IFW Dresden, Institute for Metallic Materials, P.O. Box 270016, D-01171 Dresden, Germany O. GUTFLEISCH IFW Dresden, Institute for Metallic Materials, P.O. Box 270016, D-01171 Dresden, Germany |
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| Abstract: | High-energy ball milling was used for the synthesis and modification of a variety of light metal hydrides (MgH2) and complex hydrides (LiAlH4, NaAlH4, and LiBH4) by changing the milling conditions and the added catalyst (Ti, TiCl3, ScCl3, and MgCl2). The combination of the milling technique with a specially designed vial allowed the in-situ monitoring of the reaction pressure and vial temperature variations taking place during the milling process. This provided immediate and valuable information about the efficiency of the reactions before removing the products from the vial. The dependence of the powder composition with the milling conditions and the catalyst was carried out by X-ray diffraction and Raman spectroscopy at room temperature. The use of different catalysts and milling pressures was found to have a profound effect on the reaction efficiencies during the synthesis of doped NaAlH4 from a mixture of NaH + Al + (4% mol) catalyst. Different milling pressures were also found to change the reactivity of the Mg99Nil alloy during the synthesis of MgH2. The use of catalysts was observed to affect the milling of LiAlH4 and LiAlH4 + TiCl3 and the synthesis of Mg(BH4)2 from a mixture of LiBH4 and MgCl2. | |
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