Abstract
Summary form only given. The glasses doped with higher concentration of Transition metal (TM) ions have found important application in semiconducting, memory and switching devices [1]. However, low concentration of certain TM ions are equally important for their use as sensitizer in rare earth doped glasses having great potentiality for laser action [2]. Recently we have reported similar studies for Cr/sup 3+/ in phosphate and chlorophosphate glasses [3]. In this paper the dc conductvity in the temperature range (343-503K) has been studied for Co/sup 2+/ doped phosphate and chlorophosphate glasses (doping concentration are: 0.1, 0.2, 0.3, 0.4, and 0.5 mol%). The observed absorption bands In the region 350-800 nm have been assigned to different transition assuming an octahedral symmetry.
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