FIZIKA A 9 (2000) 4 , 159-168

IONIC TRANSPORT IN ALKALI HALIDES WITH DOPING-INDUCED DEFECTS AND COLOUR CENTRE MIGRATION BY THERMAL BLEACHING

SATYAJIT KAR, AJAY KUMAR MAITI, MANJUSTRI SENGUPTA and KUSHALENDU GOSWAMI

Department of Physics, Jadavpur University, Calcutta 700032, India

Received 31 May 2000; Accepted 12 February 2001

Measurements of ionic conductivity in pure alkali halides and in alkali halides with doping-induced defects were made to determine the activation energies and mobility of F-centres. The activation energies in NaCl:Cd⁺² were found large in comparison with NaCl with other divalent impurities. The mobilities of F-centre migration on bleaching of injected electrons were measured and the activation energies of bleaching W_F have been found. The results for space-charge-limited conduction of F-centres are explained with the determined values of activation energies W and W_F.

PACS numbers: 61.72.Ww, 61.72.Ji, 66.10.Ed
UDC 537.311.32

Keywords: pure alkali halides, alkali halides with doping-induced defects, divalent impurities, activation energies, mobility of F-centres, space-charge-limited conduction

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