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Title: Spectroscopic and transport studies of Cu2+ doped in (30-x)Na2O-xNaF-50B2O3-20Bi2O3 glass system
Authors: Suresh, Swapna S
Chandramouli, V
Keywords: (30-x) Na2O-x NaF-50 B2O3-20 Bi2O3
Spectroscopic properties
Electrical conductivity
Issue Date: Aug-2004
Publisher: CSIR
IPC CodeG 01 J 3/12
Abstract: ESR, optical absorption, IR and dc electrical conductivity of (30-x)Na2O-xNaF-50B2O3-20 Bi2O3 glass system have been investigated. From infrared results, it is observed that the glass is made up of [BO3] and [BO4] units and in fluorine rich glass B-F bonds are formed. ESR results show that Cu2+ has tetragonal distorted octahedral coordination and its ground state is dx2-y2. The observed changes in spin-Hamiltonian parameters with increasing concentration of NaF can be attributed to the decrease in the field strength at Cu2+ ion site .The decrease in a value can be attributed to decreasing ionic character of the glass. The existence of maxima of optical absorption at x =18 mole% of NaF is attributed to the formation of BO2F2 structural units. The dc electrtrical conductivity studies show that mobile ions are Na+ and the activation energy is attaining a maximum value at x =18 mole% of NaF characterizing a mixed anion effect.
Page(s): 560-564
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.42(08) [August 2004]

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