Diffusive hydrogen motion in ZrBe2H0.56: A quasielastic neutron scattering study

Diffusive hydrogen motion in ZrBe2H0.56: A quasielastic neutron scattering study

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 500K using two spectrometers covering a wide range of resolutions from 1 t...

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Veröffentlicht in:Physica. B, Condensed matter Condensed matter, 2006-11, Vol.385-386, p.208-211, Article 208
Hauptverfasser: Cappelletti, R.L., Udovic, T.J., Chowdhuri, Z., Hauback, B.C., Maeland, A.J., Dimeo, R.M.
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container_title Physica. B, Condensed matter
container_volume 385-386
creator Cappelletti, R.L.
Udovic, T.J.
Chowdhuri, Z.
Hauback, B.C.
Maeland, A.J.
Dimeo, R.M.
description 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 500K using two spectrometers covering a wide range of resolutions from 1 to 64mueV 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+/-0.02eV.
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