K0.46Na0.54NbO3 ferroelectric ceramics: chemical synthesis, electro-mechanical characteristics, local crystal chemistry and elastic anomalies

Yi, Zhiguo and Liu, Yun and Carpenter, Michael A. and Schiemer, Jason and Withers, Ray L. (2011) K0.46Na0.54NbO3 ferroelectric ceramics: chemical synthesis, electro-mechanical characteristics, local crystal chemistry and elastic anomalies. Dalton Transactions, 40 (18). pp. 5066-5072. ISSN 1477-9226 1477-9234 DOI 10.1039/C0DT01666G

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Official URL: http://dx.doi.org/10.1039/C0DT01666G

Abstract

K0.46Na0.54NbO3 ceramics have been fabricated via a chemical synthesis route. It was found that 500 [degree]C heat treatment is sufficient to crystallize the niobate powder and the ceramic sintered at 1080 [degree]C in air shows good ferroelectric and piezoelectric properties (Pr [similar] 15 [small mu ]C cm-2, d33 [similar] 120 pC N-1). Electron diffraction patterns not only determine the space group symmetry of Pcm21 for the first time, but also reveal structural disorder in K0.46Na0.54NbO3, and 1-D correlated strings of Nb-O atomic displacements are suggested to account for the polar behaviour. Elastic constants such as the bulk and shear moduli as well as their evolution with temperature were also measured using the resonant ultrasound spectroscopy method.

Item Type: Article
Uncontrolled Keywords: 2011AREP; IA63;
Subjects: 03 - Mineral Sciences
Journal or Publication Title: Dalton Transactions
Volume: 40
Page Range: pp. 5066-5072
Identification Number: 10.1039/C0DT01666G
Depositing User: Sarah Humbert
Date Deposited: 12 Aug 2011 16:50
Last Modified: 23 Jul 2013 10:02
URI: http://eprints.esc.cam.ac.uk/id/eprint/2158

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