Issue 18, 2011

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

Abstract

K0.46Na0.54NbO3 ceramics have been fabricated via a chemical synthesis route. It was found that 500 °C heat treatment is sufficient to crystallize the niobate powder and the ceramic sintered at 1080 °C in air shows good ferroelectric and piezoelectric properties (Pr ∼ 15 μC cm−2, d33 ∼ 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.

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

Article information

Article type
Paper
Submitted
04 Nov 2010
Accepted
25 Feb 2011
First published
31 Mar 2011

Dalton Trans., 2011,40, 5066-5072

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

Z. Yi, Y. Liu, M. A. Carpenter, J. Schiemer and R. L. Withers, Dalton Trans., 2011, 40, 5066 DOI: 10.1039/C0DT01666G

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