Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1816592 | Physica B: Condensed Matter | 2006 | 4 Pages |
Abstract
In ZrBe2H0.56, Be planes are separated by hexagonal Zr planes in the AlB2 structure with the H atoms occupying interstitial sites that form a honeycomb net in the Zr planes. The data from quasielastic neutron scattering above 500 K using two spectrometers covering a wide range of resolutions from 1 to 64 μeV can be fitted with a simple model using only two parameters for all momentum transfers at each temperature. The parameters are an elastic-like fraction and the hopping rate of a quasielastic contribution consisting of 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 energy of 0.30±0.02 eV.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
R.L. Cappelletti, T.J. Udovic, Z. Chowdhuri, B.C. Hauback, A.J. Maeland, R.M. Dimeo,