Abstract
Abstract The effect of surface deformation on [Li]° coloration in lithium-doped MgO crystals is reported. For chemically etched surfaces, the threshold temperature for [Li]° production in oxygen atmospheres is observed to be 1160 K. For mechanically deformed surfaces, such as are produced by SiC abrasives, sub-threshold production of [Li]° defects was observed down to 1050 K. Upon heating the specimens in oxygen at sub-threshold temperatures, decoration of strained regions in the bulk or surfaces of MgO crystals has been produced using [Li]° coloration. These results provide direct evidence that the formation of [Li]° defects is enhanced by dislocations and/or their debris in the crystal. Sub-threshold [Li]° coloration, in conjunction with optical and transmission electron microscopy, indicates that, at elevated temperatures, deformation bands are propagated from surface microcracks to a depth of the order of 1 mm.
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