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Relaxor behavior of K0.5La0.5Bi2Nb2O9 ceramics

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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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
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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