Material Technology

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
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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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