Effect of doping concentration on electrical and spectral properties of doped glasses

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.