Karthik, C and Ravishankar, N and Varma, KBR and Maglione, Mario and Vondermuhll, R and Etourneau, J (2006) Relaxor behavior of K0.5La0.5Bi2Nb2O9 ceramics. In: Applied Physics Letters, 89 (4). 042905-042905.
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Abstract
K0.5La0.5Bi2Nb2O9, a relaxor, was synthesized and the structural studies confirmed it to be an n = 2 member of the Aurivillius oxides. The ½{h00} and ½{hk0} types of superlattice reflections in the electron diffraction patterns reflected the presence of ordered polar regions. A broad dielectric peak with frequency dependent dielectric maximum temperature was observed. The dielectric relaxation obeyed the Vogel-Fulcher relation wherein Ea = 0.04 eV, Tf = 428 K,and ωo = 1010 Hz. The diffuseness parameter γ = 2.003 established the relaxor nature and it was attributed to the A-site cationic disorder. The piezoelectric d31 coefficient was 0.5 pC/N at 300 K and 2 pC/N at 480 K.
Item Type: | Journal Article |
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Publication: | Applied Physics Letters |
Publisher: | American Institute of Physics |
Additional Information: | Copyright of this article belongs to American Institute of Physics. |
Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
Date Deposited: | 03 Jan 2012 08:53 |
Last Modified: | 03 Jan 2012 08:53 |
URI: | http://eprints.iisc.ac.in/id/eprint/43010 |
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