The 50K transition in β-phase palladium deuteride observed by neutron scattering
- 14 May 1978
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 11 (9) , L381-L384
- https://doi.org/10.1088/0022-3719/11/9/005
Abstract
A first direct observation of the '50K' structural transition in beta -phase palladium hydride has been made using neutron scattering. This observation, of a superlattice reflection at (1/210), allows us to conclude that the transition is essentially an order-disorder transition involving a local rearrangement of deuterium atoms and vacancies between the eight indifferent interpenetrating FCC sublattices having twice the original lattice parameter. The low intensity of the reflection corresponds to a small value for the long-range order parameter and its dimensions in reciprocal space indicate that the long-range order only extends to about 25 AA.Keywords
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