Majhi, Koushik ; Varma, K. B. R. ; Rao, K. J. (2009) Possible mechanism of charge transport and dielectric relaxation in SrO-Bi2O3-B2O3 glasses Journal of Applied Physics, 106 (8). 084106_1-084106_8. ISSN 0021-8979
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Official URL: http://jap.aip.org/resource/1/japiau/v106/i8/p0841...
Related URL: http://dx.doi.org/10.1063/1.3246810
Abstract
Transparent SrBi2B2O7 glasses were prepared via melt-quenching technique and characterized using differential scanning calorimetry and x-ray powder diffraction. The ac conductivities of the glasses were studied as a function of frequency (100 Hz-10 MHz) at different temperatures. The frequency dependence of conductivity has been analyzed using Almond-West expression. The exponent n was nearly unaffected by temperature. Impedance and modulus spectroscopies were employed to further examine the electrical data. Dielectric relaxation exhibited a stretched exponential behavior with a stretching exponent beta independent of temperature. From conductivity analysis we have proposed that the charge transport occurs through the participation of nonbridging oxygen (NBO), which switches positions in a facile manner. The stretched exponential behavior appears to be a direct consequence of the NBO switching mechanism of charge transport.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Institute of Physics. |
| Keywords: | Bismuth Compounds; Borate Glasses; Dielectric Relaxation; Differential Scanning Calorimetry; Electrical Conductivity; Melt Processing; Optical Glass; Strontium Compounds; X-ray Diffraction |
| ID Code: | 91029 |
| Deposited On: | 16 May 2012 08:35 |
| Last Modified: | 16 May 2012 08:35 |
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