Ganesamoorthy, S. ; Bhaumik, Indranil ; Bhatt, R. ; Karnal, A. K. ; Gupta, P. K. ; Kumaragurubaran, S. ; Mohankumar, R. ; Kitamura, Kenji ; Takekawa, Shunji ; Nakamura, Masaru (2008) A comparative study of dielectric relaxation in Sr0.61Ba0.39Nb2O6 and Sr0.75Ba0.25Nb2O6 single crystals Japanese Journal of Applied Physics, 47 . pp. 1012-1015. ISSN 0021-4922
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Official URL: http://jjap.jsap.jp/link?JJAP/47/1012/
Related URL: http://dx.doi.org/10.1143/JJAP.47.1012
Abstract
Dielectric behaviour of Sr0.61Ba0.39Nb2O6 (61SBN) and Sr0.75Ba0.25Nb2O6 (75SBN) single crystals has been studied. It is observed that 61SBN has relatively low diffuseness as well as smaller relaxation compared to 75SBN. Increase in the configurational entropy imposed by the change in defect structure is suggested to be the origin of this behaviour. Analysis using Vogel-Fulcher expression and modified Curie-Weiss law give a signature of long-range polar order in 61SBN. The value of γ for 61SBN is closer to unity (1.14), where as for 75SBN it is 1.52. The fluctuation (in the orientation) of dipoles near dielectric maxima in SBN system is mediated by a paraelectric state.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Institute of Pure and Applied Physics. |
| ID Code: | 83695 |
| Deposited On: | 22 Feb 2012 12:49 |
| Last Modified: | 22 Feb 2012 12:49 |
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