Abstract
The mechanoluminescence (ML) of NaCl, NaBr, NaF, LiCl and LiF crystals ceases at 105, 58, 170, 151 and 175°C respectively. Both the temperatureT c at whichML disappears and the temperatureT s required to induce a particular percentage of colouration decay in a given time, decreases with increasing nearest neighbour distance in alkali halide crystals. This perhaps suggests that similar processes cause the disappearance ofml in alkali halide crystals and the colouration decay in their microcrystalline powders. It is shown that mobile dislocations may cause the leakage of surface charge and the decay of colouration in microcrystalline powders.
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Chandra, B.P., Verma, R.D., Khokhar, M.S.K. et al. Mechanoluminescence excitation in alkali halide crystals and colouration decay in microcrystalline powders. Pramana - J Phys 25, 723–731 (1985). https://doi.org/10.1007/BF02847733
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DOI: https://doi.org/10.1007/BF02847733