Mechanoluminescence excitation in alkali halide crystals and colouration decay in microcrystalline powders |
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| Authors: | B P Chandra R D Verma M S K Khokhar S V Moharil K K Batra B T Deshmukh |
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| Institution: | (1) Department of Physics, Rani Durgavati University, 482 001 Jabalpur, India;(2) Department of Physics, Government Science College, 492 002 Raipur, India;(3) Department of Physics, Nagpur University, 440 010 Nagpur, India |
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| 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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| Keywords: | Mechanoluminescence triboluminescence colour centres dislocations alkali halides |
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