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Issue 30, 2012
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Phase coexistence in NaNb(1−x)TaxO3 materials with enhanced dielectric properties

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Abstract

NaNb(1−x)TaxO3 (0.1 ≤ x ≤ 0.9) materials have been synthesized and investigated by combining diffraction methods and high resolution electron microscopy with dielectric measurements. The stabilization of lead-free ferroelectric materials has been established from a threshold dopant composition of 40%, probing the doping process in the B-cationic sublattice of the perovskite structure to be a suitable approach for tuning the dielectric properties of the antiferroelectric NaNbO3 oxide. Rietveld analysis of the room temperature powder X-ray diffraction data for ferroelectric compositions has provided unambiguous evidence for the coexistence of two different orthorhombic phases with lattice parameters ac ≈ √2ac, b ≈ 2ac in the 0.4 ≤ x ≤ 0.6 composition range, a non-centrosymmetric ferroelectric phase (P21ma) and a centrosymmetric paraelectric phase (Pcmn). The change in the order of the phase transitions from first order-like to second order seems to be related to the coexistence of ferroelectric and paraelectric phases, with the NaNb(1−x)TaxO3 (0.4 ≤ x ≤ 0.6) materials showing an enhanced dielectric response.

Graphical abstract: Phase coexistence in NaNb(1−x)TaxO3 materials with enhanced dielectric properties

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Article information


Submitted
03 Apr 2012
Accepted
21 May 2012
First published
21 May 2012

J. Mater. Chem., 2012,22, 14938-14943
Article type
Paper

Phase coexistence in NaNb(1−x)TaxO3 materials with enhanced dielectric properties

A. Torres-Pardo, R. Jiménez, E. García-González and J. M. González-Calbet, J. Mater. Chem., 2012, 22, 14938
DOI: 10.1039/C2JM32078A

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