Electrical relaxation in CdI2 doped silver vanadate superionic glasses

Ghosh, Aloka ; Dutta, D. ; Kabi, S. ; Ghosh, A. (2009) Electrical relaxation in CdI2 doped silver vanadate superionic glasses Journal of Applied Physics, 105 (6). 064107_1-064107_5. ISSN 0021-8979

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Official URL: http://jap.aip.org/resource/1/japiau/v105/i6/p0641...

Related URL: http://dx.doi.org/10.1063/1.3095512


In this paper we have studied electrical relaxation in several compositions of CdI2-Ag2O-V2O5 superionic glasses in wide frequency and temperature ranges. We have used the power law formalism as well as the electric modulus formalism to analyze the experimental results. We have observed that the dc conductivity increases and the activation energy decreases with the increase of the CdI2 content in the compositions. We have also observed that the concentration of mobile Ag+ ions is not thermally activated and is almost independent of CdI2 content. The mobile ion concentration is also less than that of the total Ag+ ions present in the compositions. The conductivity is primarily determined by the mobility rather than the ion concentration. The conductivity relaxation time shows Arrhenius behavior with an activation energy, which is almost equal to that of the dc conductivity, indicating that the same ions take part in the dc and the ac conduction. The values of frequency exponent and stretching exponent are observed to be almost temperature and composition independent. The exponents are less than unity and obey the relationship proposed by Ngai.

Item Type:Article
Source:Copyright of this article belongs to American Institute of Physics.
Keywords:Cadmium Compounds; Glass; Silver Compounds; Superionic Conductivity; Vanadium Compounds
ID Code:72812
Deposited On:29 Nov 2011 13:27
Last Modified:29 Nov 2011 13:27

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