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Quasielastic neutron scattering study of diffusive hydrogen motion in Zr Be2 H0.56

Cappelletti, R.L. , Chowdhuri, Z. , Udovic, T.J. , Dimeo, R.M. , Hauback, B.C. , Maeland, A.J.
Physical review B, Vol. 73, no. 22 (2006), 224109
Publ. year
2006
Publ. type
article
Abstract
In Zr Be2 H0.56 above 500 K, Be planes are separated by hexagonal Zr planes in the Al B2 structure with the H atoms occupying interstitial sites that form a honeycomb net in the Zr planes. The data from quasielastic neutron scattering using two spectrometers covering a wide range of resolutions from 1 μ eV to 64 μ eV can be fitted with a simple model using only two parameters for all momentum transfers at each temperature. The parameters are an elasticlike fraction and the hopping rate associated with a quasielastic contribution described by two-dimensional nearest-neighbor uncorrelated hopping among the partially occupied interstitial sites. The temperature dependence of the hopping rate follows an Arrhenius relation with an activation enthalpy of (0.30±0.02) eV. © 2006 The American Physical Society.
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