On the time delay of the photoplastic effect
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ences between metallic glasses and quasicrystals seems preferable to the "universal" view, which may be questioned as simplistic.
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On the time delay of the photoplastic effect Joseph Pellegrino and J. M. Galligan Department of'Metallurgy and Institute of'Materials Science, University of Connecticut, Storrs, Connecticut 06268 (Received 17 December 1985; accepted 30 December 1985) Photoplasticity in mercury cadmium telluride, Hgj _ x Cdx Te with x = 0.3, has been studied as a function of light frequency and deformation temperature. We show that there is an easily measurable time delay accompanying irradiation of the crystal and the change in stress. This time delay is temperature dependent, suggesting a diffusion of charge carriers, introduced by the light, to the interior of the crystal. A simple analysis is given of the observed temperature dependence that is consistent with the experiments.
Defects in semiconductor crystals are of importance in determining their electronic behavior. An interesting aspect of defect behavior in many semiconductor crystals, especially II-VI compounds, is the influence of incident light on the plastic behavior of these materials. If, during deformation of a II-VI compound it is irradiated with light, then the plastic deformation of the material is altered significantly.1"14 This process involves the introduction of electron-hole pairs, some of which subsequently interact, either directly or indirectly, with mobile dislocations within the m
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