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Dielectric dispersion in PbO-PbF₂-B₂O₃ glass system doped with Cr₂O₃

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Title Dielectric dispersion in PbO-PbF₂-B₂O₃ glass system doped with Cr₂O₃
 
Creator Rao, A Veerabhadra
Reddy, M Srinivasa
Kumar, V Ravi
Veeraiah, N
 
Subject Glasses
Dielectric properties
Optical absorption
ESR
IR spectra
 
Description 926-934
PbO-PbF₂-B₂O₃ glasses containing different concentrations of chromium ions (introduced as Cr₂O₃) ranging from 0 to 0.4 mol % were prepared. The dielectric properties i.e., constant Ɛ', loss tan δ, ac conductivity σac over a range of frequency and temperature of Pb glasses have been carried out. The results have been analyzed in the light of different oxidation states of chromium ions with aid of the data on differential scanning calorimetry, infrared, optical absorption and ESR spectra. The analysis indicates that when the concentration of chromium ions is up to ~ 0.3 mol %, these ions mostly exist in Cr₃₊ state, occupy network-modifying positions with CrO₆ structural units and at about 0.4 mol % a part of chromium ions seems to exist in Cr⁶⁺ state, adopting network forming positions with CrO₄²⁻structural units and causing an increase in the insulating strength of the glass.
 
Date 2008-12-30T05:16:29Z
2008-12-30T05:16:29Z
2007-11
 
Type Article
 
Identifier 0019-5596
http://hdl.handle.net/123456789/2695
 
Language en_US
 
Relation GOIR 27/26, F21K 2/04
 
Publisher CSIR
 
Source IJPAP Vol.45(11) [November 2007]