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Measurements are reported for the recovery of stress-induced dichroism in the 9 mu m oxygen infrared absorption band for samples given various treatments prior to stressing. Enhanced hopping rates are observed in samples deliberately contaminated with copper or iron and the degree of enhancement up to a factor of 10 2 depends on the conditions of the stressing treatment. It is also shown that the enhancement is a transient effect. The results are tentatively explained in terms of an oxygen-vacancy interaction with the vacancies being generated by site switching of the metal atoms.
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Newman et al. (1985) studied this question.
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