Anisotropy of Hydrogen Diffusivity in ZnO

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Hydrogen absorption and diffusivity in high quality ZnO crystals were investigated in this work by X-ray diffraction combined with slow positron implantation spectroscopy and electrical resistometry. ZnO crystals were covered by a thin Pd over-layer and electrochemically charged with hydrogen. It was found that absorbed hydrogen causes plastic deformation in a sub-surface region. The depth profile of hydrogen concentration introduced into the crystal was determined by nuclear reaction analysis. Enhanced hydrogen concentration was found in the sub-surface region due to excess hydrogen atoms trapped at defects introduced by plastic deformation. Hydrogen diffusion in ZnO crystals with various orientations was studied by in-situ electrical resistometry. It was found that hydrogen diffusion in the c-direction is faster than hydrogen diffusion in the a-direction most probably due to open channels existing in the wurtzite structure along the c-axis.

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Edited by:

Prof. Andreas Öchsner, Prof. Irina V. Belova and Prof. Graeme E. Murch

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39-49

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J. Čížek et al., "Anisotropy of Hydrogen Diffusivity in ZnO", Defect and Diffusion Forum, Vol. 333, pp. 39-49, 2013

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January 2013

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$41.00

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