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Title: Effect of strontium impurity ions on conductivity of KBr:Sr
Authors: Saibabu, G
Kumar, N Yasanth
Reddy, C Suresh
Kanth, D Sri
Reddy, A Ramachandra
Issue Date: Apr-2002
Publisher: NISCAIR-CSIR, India
Abstract: The study on ionic conductivity versus reciprocal temperature of pure KBr and KBr crystals doped with 0.075, 0.35 and 0.75 mole % strontium has been carried out in as -grown quenched from elevated temperatures (200, 300 and 400 °C) and deformed by different percentages. The plots exhibits three well-known regions as II, III and IV (extrinsic regions). But the region IV is not shown in the plots. The intrinsic region I was not observed in the plots as the conductivity measurements were taken up to 575 °C. From the analysis of these plots activation energies for the migration of cation vacancy, the association of strontium ion with cation vacancy in the lattice of KBr crystals are calculated. The values are compared with previously reported values. Further the variation in conductivity is explained on the basis of formation of impurity-vacancy dipoles, vacancy-vacancy pairs (which appear in the form of precipitation), storage of cation vacancies in a form or defects; introduction of fresh dislocations etc.
Page(s): 290-296
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.40(04) [April 2002]

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