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Nanoscale magnesium as a hydrogen storage material

Paloumpi, Athanasia (2010)
M.Res. thesis, University of Birmingham.

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Abstract

This work investigates the structural and hydrogenation properties of nanoscale magnesium in various forms (powders and thin films). A structure consisting of Mg and Ti multilayered thin films is also proposed and studied. The Mg and Mg/Ti thin film samples were fabricated using a magnetron sputtering system. SEM and XRD allowed the study of the structures and composition of the Mg and Mg/Ti thin film samples. XRD confirmed a (002) preferential orientation of the films in agreement with literature. Differences in the sputtering conditions of the Mg/Ti samples also showed differences in their XRD patterns. Furthermore, the XRD results also showed the existence of intrinsic stresses within the films. Hydrogenation properties were studied mainly using thermo-volumetric and gravimetric analysis. The hydrogenation of the samples was confirmed using XRD. Sorption enthalpies of the films were calculated through van’t Hoff plots and were found to be quite high. However, the 40 layer Mg/Ti sample displayed the lowest enthalpy of all (due to the cooperative phenomena). Studies on sorption kinetics showed the fastest absorption kinetics for the 40 layer Mg/Ti sample while the 20 layered sample exhibited the fastest desorption. Finally, TPD results showed a possible presence of the metastable \(\gamma\)-MgH\(_2\) phase.

Type of Work:M.Res. thesis.
Supervisor(s):Book, David
School/Faculty:Schools (1998 to 2008) > School of Engineering
Department:Department of Metallurgy and Materials
Subjects:TP Chemical technology
TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:1382
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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