Structural stability of mechanically alloyed (Mg+10Nb) and (MgH2+10Nb) powder mixtures

Shang, CX, Bououdina, M and Guo, ZX (2003) Structural stability of mechanically alloyed (Mg+10Nb) and (MgH2+10Nb) powder mixtures. Journal of Alloys and Compounds, 349 (1-2). pp. 217-223. ISSN 1873-4669

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In order to improve the hydrogen storage characteristics of magnesium, both chemical alloying by Nb and mechanical alloying (MA) of (Mg+10 wt.%Nb) and (MgH2+10 wt.%Nb) powder mixtures were investigated, with particular attention paid to their structural stability. Extensive powder refinement was noted for both compositions within 20 h of milling at 250 rpm. Even nano-sized particles were generated in the hydride mixture. XRD and Rietveld analyses show the formation of a bcc phase in each case. The amount of the bcc phase increases with increasing milling time to the detriment of Nb. For the (Mg+10 wt.%Nb) mixture, it is confirmed that the newly formed phase is a bcc-(Nb,Mg) solid solution, with an extended solubility of Nb in Mg. However, for the (MgH2+10 wt.%Nb) powder mixture, the new bcc phase can be a Nb hydride (NbHx, x<1.0), or a bcc-(Nb,Mg) solid solution, or a (Nb,Mg)Hx solid solution, or even a mixture of the three.

Item Type: Article
Faculty \ School: Faculty of Science > School of Environmental Sciences
UEA Research Groups: Faculty of Science > Research Groups > Geosciences
Depositing User: Rachel Snow
Date Deposited: 16 Mar 2011 14:40
Last Modified: 11 Jan 2023 15:34
DOI: 10.1016/S0925-8388(02)00920-9

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