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Title: Spectroscopic and transport studies of Cu<sup>2+ </sup>doped in (30-<i>x</i>)Na<sub>2</sub>O-<i>x</i>NaF-50B<sub>2</sub>O<sub>3</sub>-20Bi<sub>2</sub>O<sub>3</sub> glass system<b style=""></b>
Authors: Suresh, Swapna S
Chandramouli, V
Keywords: (30-<i>x</i>) Na<sub>2</sub>O-<i>x</i> NaF-50 B<sub>2</sub>O<sub>3</sub>-20 Bi<sub>2</sub>O<sub>3</sub>
Spectroscopic properties
Electrical conductivity
Issue Date: Aug-2004
Publisher: CSIR
Series/Report no.: G 01 J 3/12
Abstract: ESR, optical absorption, IR and dc electrical conductivity of (30-<i>x</i>)Na<sub>2</sub>O-<i>x</i>NaF-50B<sub>2</sub>O<sub>3</sub>-20 Bi<sub>2</sub>O<sub>3</sub> glass system have been investigated. From infrared results, it is observed that the glass is made up of [BO<sub>3</sub>] and [BO<sub>4</sub>] units and in fluorine rich glass B-F bonds are formed. ESR results show that Cu<sup>2+</sup> has tetragonal distorted<sup> </sup>octahedral coordination and its ground state is d<sub>x</sub><sup>2</sup><sub>-y</sub><sup>2</sup>. The observed changes in spin-Hamiltonian parameters with increasing concentration of NaF can be attributed to the decrease in the field strength at Cu<sup>2+</sup> 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 <i>x</i> =18 mole% of NaF is attributed to the formation of BO<sub>2</sub>F<sub>2</sub> structural units. The dc electrtrical conductivity studies show that mobile ions are Na<sup>+</sup> and the activation energy is attaining a maximum value at <i>x</i> =18 mole% of NaF characterizing a mixed anion effect.
Description: 560-564
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.42(08) [August 2004]

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