An in situ neutron diffraction measurement of the pressure-temperature evolution of a MgD2:TiD2 mixture

Moser, D; Bull, DJ; Cowpe, JS; Roach, D; Ross, DK; Noreus, D; Tucker, MG

Abstract

The hydrogen storage capacity of Mg–Ti–H films is approximately five times that of conventional metal
hydride electrodes in NiMH-batteries. Mg and Ti are considered to be immiscible in the bulk and the
ambient pressure phase diagram of Mg and Ti indicates that no binary stable bulk compounds are formed.
However, in the presence of hydrogen, an Mg–Ti–H phase has been obtained by Kyoi et al. using a high
pressure synthesis – where magnesium hydride is compacted with different TM-hydrides in an anvil cell at
pressures of the order several GPa (4–8 GPa) and at a temperature of 873 K. In this work, we have proved
the feasibility of in situ powder diffraction using the Paris–Edinburgh high pressure cell for the observation
of structural changes on this system and we propose modifications to improve the output of the experiment.
Keywords: structure; phase transition; metal hydrides; neutron diffraction; high pressure cell

Citation

Moser, D., Bull, D., Cowpe, J., Roach, D., Ross, D., Noreus, D., & Tucker, M. (2010). An in situ neutron diffraction measurement of the pressure-temperature evolution of a MgD2:TiD2 mixture. High Pressure Research, 30(4), 643-652. https://doi.org/10.1080/08957959.2010.533664

• Journal Article Type: Article
• Publication Date: Jan 1, 2010
• Deposit Date: Jun 22, 2011
• Journal: High Pressure Research
• Print ISSN: 0895-7959
• Publisher: Taylor and Francis
• Peer Reviewed: Peer Reviewed
• Volume: 30
• Issue: 4
• Pages: 643-652
• DOI: https://doi.org/10.1080/08957959.2010.533664
• Publisher URL: http://dx.doi.org/10.1080/08957959.2010.533664
• Additional Information: Corporate Creators : Centre for Materials and Physics Research, Structural Chemistry, Stockholm University, STFC Rutherford Appleton Laboratory