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Issue 10, 2013
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High temperature Aurivillius piezoelectrics: the effect of (Li, Ln) modification on the structure and properties of (Li, Ln)0.06(Na, Bi)0.44Bi2Nb2O9 (Ln = Ce, Nd, La and Y)

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Abstract

High temperature Aurivillius piezoelectrics, (Li, Ln)0.06(Na, Bi)0.44Bi2Nb2O9 (NBN-LiLn), with Li and Ln (Ce, Nd, La and Y) co-substitution at the A site, were prepared using a solid-state reaction process. Taking cation disordering between A site and the (Bi2O2)2+ layers into consideration, the crystal structure of (Li, Nd)0.06(Na, Bi)0.44Bi2Nb2O9 (NBN-LiNd) was refined by using the Rietveld method with powder X-ray diffraction, which was confirmed to be a two-layer Aurivillius oxide with an orthorhombic space group, A21am [a = 5.48666(9) Å, b = 5.46046(8) Å, c = 24.9122(4) Å and Z = 4], at room temperature. LiNd substitution induced a decrease in cation disorder and an increase in orthorhombic distortion. The ferroelectric to paraelectric phase transition temperature (Tc) of the NBN-LiLn (Ln = Ce, Nd, La and Y) ceramics ranged from 751 to 842 °C and the Tc increased as the radii of the Ln3+ (Ce3+, Nd3+, La3+ and Y3+) was decreased. The NBN-LiCe and NBN-LiNd had a d33 of 31 and 29 pC N−1, respectively, which is much higher than the reported d33 values of other Aurivillius ceramics with a high Tc (Tc > 650 °C, d33 < 20 pC N−1). With increasing annealing temperature, a significant degradation in d33 was observed for NBN-LiCe, while no drop in d33 was observed up to 650 °C for NBN-LiNd. The inhomogeneous domain structures determined the dissimilar piezoelectric behaviors of NBN-LiCe and NBN-LiNd.

Graphical abstract: High temperature Aurivillius piezoelectrics: the effect of (Li, Ln) modification on the structure and properties of (Li, Ln)0.06(Na, Bi)0.44Bi2Nb2O9 (Ln = Ce, Nd, La and Y)

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Supplementary files

Article information


Submitted
25 Oct 2012
Accepted
03 Dec 2012
First published
03 Dec 2012

Dalton Trans., 2013,42, 3561-3570
Article type
Paper

High temperature Aurivillius piezoelectrics: the effect of (Li, Ln) modification on the structure and properties of (Li, Ln)0.06(Na, Bi)0.44Bi2Nb2O9 (Ln = Ce, Nd, La and Y)

C. Long, H. Fan and M. Li, Dalton Trans., 2013, 42, 3561
DOI: 10.1039/C2DT32564K

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