The theory of the deformation population of dislocation bands in coloured alkali halide crystals was considered. It was shown that, in the lattice surrounding an edge dislocation in a coloured alkali halide crystals, some F-centres lay in the compression region and some lay in the expansion region of the dislocation. Because of their lower density in the expansion region, the gap between the dislocation band (just above the F-centre level) and F-centre level could decrease and become comparable with kT. Consequently, F-centre electrons could jump into the dislocation band. Thus, the deformation population of the dislocation band could arise during the interaction of moving dislocations with F-centres. This model was able to explain several processes which occurred during the mechanical deformation of coloured alkali halide crystals. These included mechanoluminescence, dislocation exo-electron emission, deformation bleaching of F-centres, deformation quenching of thermoluminescence and the coloration decay of microcrystalline powders.

Deformation Population of Dislocation-Band in Coloured Alkali Halide Crystals. B.P.Chandra, R.K.Tiwari, B.Ojha, B.Selot, R.K.Kuraria: Indian Journal of Pure and Applied Physics, 1996, 34[4], 211-7