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

D. Moser; D. J. Bull; J. S. Cowpe; D. L. Roach; D. K. Ross; D. Noreus; M. G. Tucker

doi:10.1080/08957959.2010.533664

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

D. Moser, D. J. Bull, J. S. Cowpe, D. L. Roach, D. K. Ross, D. Noreus, M. G. Tucker

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

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 (4-8GPa) and at a temperature of 873K. 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.

Original language	English
Pages (from-to)	643-652
Number of pages	10
Journal	High Pressure Research
Volume	30
Issue number	4
DOIs	https://doi.org/10.1080/08957959.2010.533664
State	Published - Dec 2010
Externally published	Yes

Funding

Funding from the European Commission DG Research through contracts MRTN-CT-2004-512443/HYTRAIN (DM) and SES6-2006-518271/NESSHY (DN, DJB, DKR) is greatefully acknowledged. The authors are indebted to the ISIS Pulsed Neutron Facility for provision of beam-time.

Keywords

high pressure cell
metal hydrides
neutron diffraction
phase transition
structure

Access to Document

10.1080/08957959.2010.533664

Cite this

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

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 (4-8GPa) and at a temperature of 873K. 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.",

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AU - Moser, D.

AU - Bull, D. J.

AU - Cowpe, J. S.

AU - Roach, D. L.

AU - Ross, D. K.

AU - Noreus, D.

AU - Tucker, M. G.

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