Influence of titanium ions on spectroscopic and dielectric properties of PbO-Bi2O3-As2O3 glasses

PbO-Bi2O3-As2O3 glasses mixed with different concentrations of TiO2 (ranging from 0 to 2.0 mol %) were prepared. The amorphous nature of the samples was confirmed by X-ray diffraction and scanning electron microscopy. Spectroscopic studies (viz., optical absorption, IR and ESR) and dielectric proper...

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Bibliographic Details
Published in:IOP conference series. Materials Science and Engineering 2009-01, Vol.2 (1), p.012048-4
Main Authors: Reddy, M Srinivasa, Reddy, M Rami, Nagarjuna, M, Rao, P Raghava
Format: Article
Language:English
Subjects:
Absorption
Bismuth oxides
Bismuth trioxide
Conduction heating
Dielectric loss
Dielectric properties
Dielectric relaxation
High temperature
Optical properties
Titanium
Titanium dioxide
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Summary:PbO-Bi2O3-As2O3 glasses mixed with different concentrations of TiO2 (ranging from 0 to 2.0 mol %) were prepared. The amorphous nature of the samples was confirmed by X-ray diffraction and scanning electron microscopy. Spectroscopic studies (viz., optical absorption, IR and ESR) and dielectric properties (viz., dielectric constant, dielectric loss and a.c. conductivity) of these samples have been studied. The optical absorption and ESR spectral studies point out that the titanium ions co-exist in Ti3+ state with Ti4+ state. The dielectric parameters viz., ε', tan δ and σac are found to decrease and the activation energy for a.c. conduction is found to increase with the increase in the concentration of TiO2 beyond 0.8 mol %. The analysis of dielectric relaxation effects exhibited by these glasses indicated that there is a spreading of relaxation times. The conduction in the high-temperature region seems to be connected with both electronic and ionic.
ISSN:1757-899X
1757-8981
1757-899X
DOI:10.1088/1757-899X/2/1/012048