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      https://www.ias.ac.in/article/fulltext/pram/025/06/0723-0731

    • Keywords

       

      Mechanoluminescence; triboluminescence; colour centres; dislocations; alkali halides

    • Abstract

       

      The mechanoluminescence (ML) of NaCl, NaBr, NaF, LiCl and LiF crystals ceases at 105, 58, 170, 151 and 175°C respectively. Both the temperatureTc at whichML disappears and the temperatureTs 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.

    • Author Affiliations

       

      B P Chandra1 R D Verma1 2 M S K Khokhar1 2 S V Moharil1 3 K K Batra1 3 B T Deshmukh1 3

      1. Department of Physics, Rani Durgavati University, Jabalpur - 482 001, India
      2. Department of Physics, Government Science College, Raipur - 492 002, India
      3. Department of Physics, Nagpur University, Nagpur - 440 010, India

    • Dates

       
      Published
      December 1985
      Manuscript received
      9 May 1985
      Manuscript revised
      19 August 1985

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