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Metal hydride formation in palladium and palladium rich intermetallic compounds studied by in situ neutron diffraction

Published online by Cambridge University Press:  14 November 2013

H. Kohlmann ,
N. Kurtzemann  and
T. C. Hansen
H. Kohlmann*
Affiliation:
Institute of Inorganic Chemistry, Leipzig University, Leipzig, Germany
N. Kurtzemann
Affiliation:
Institute of Inorganic Solid State Chemistry, Saarland University, Saarbrücken, Germany
T. C. Hansen
Affiliation:
Institut Laue-Langevin, Grenoble, France
*
*Correspondence author, holger.kohlmann@uni-leipzig.de, +49 341 97 36201
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Abstract

In order to investigate the hydrogenation of intermetallic compounds, a gas pressure cell for in situ neutron powder diffraction based on a sapphire crystal tube was constructed. By proper orientation of the single crystal Bragg peaks of the container material can be avoided, resulting in a very low diffraction background. Using a laser heating and gas pressure controller, the hydrogenation (deuteration) of palladium and palladium rich intermetallics was studied in real time up to 8 MPa gas pressure and 700 K. Crystal structure parameters of palladium deuterides could be obtained under various deuterium gas pressures, corresponding to compositional ranges of 0.04≤x≤0.11 for the α-phase and 0.52≤x≤0.72 for the β-phase at 446 K. In situ neutron powder diffraction of the deuteration of a thallium lead palladium intermetallic Tl1-xPbxPd3 shows two superstructures of the cubic closest packing (ccp) to transform independently into a AuCu3 type structure. This proves a direct reaction to the deuterium filled AuCu3 type structure instead of a reaction cascade involving different ccp superstructures and thus gives new insights into the reaction pathways of palladium rich intermetallic compounds.

Keywords

in situ neutron diffractionmetal hydrideshydrogen storagehydrogenationreaction pathwayspalladium deuteride
Type
Technical Articles
Information
Powder Diffraction , Volume 28 , Supplement S2 , September 2013 , pp. S242 - S255
Copyright
Copyright © International Centre for Diffraction Data 2013 

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