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Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Ceramics Modified with (K0.5Na0.5)NbO3

Zang, Jiadong and Li, Ming and Sinclair, Derek C. and Jo, Wook and Rödel, Jürgen and Zhang, S. (2014):
Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Ceramics Modified with (K0.5Na0.5)NbO3.
In: Journal of the American Ceramic Society, pp. 1523-1529, 97, (5), ISSN 00027820,
[Online-Edition: http://dx.doi.org/10.1111/jace.12804],
[Article]

Abstract

The electrical and dielectric properties of (1 − x)(0.94Bi1/2Na1/2TiO3–0.06BaTiO3)–x(K0.5Na0.5NbO3) with x = 0, 0.03, 0.09, 0.18 have been investigated by impedance spectroscopy over a wide temperature range. The dc conductivity of the ceramics follows the Arrhenius law with an activation energy ranging from ~1.20 to 1.50 eV. Measurements under different atmospheres show the materials exhibit n-type semiconducting behavior at elevated temperatures. The presence of a highly polarizable phase for all compositions is revealed by electric modulus (M″) spectra. The Burns temperature decreases with increasing KNN content. The change in temperature-dependent permittivity with composition is explained by the difference in thermal evolution of polar nanoregions induced by the addition of KNN.

Item Type: Article
Erschienen: 2014
Creators: Zang, Jiadong and Li, Ming and Sinclair, Derek C. and Jo, Wook and Rödel, Jürgen and Zhang, S.
Title: Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Ceramics Modified with (K0.5Na0.5)NbO3
Language: English
Abstract:

The electrical and dielectric properties of (1 − x)(0.94Bi1/2Na1/2TiO3–0.06BaTiO3)–x(K0.5Na0.5NbO3) with x = 0, 0.03, 0.09, 0.18 have been investigated by impedance spectroscopy over a wide temperature range. The dc conductivity of the ceramics follows the Arrhenius law with an activation energy ranging from ~1.20 to 1.50 eV. Measurements under different atmospheres show the materials exhibit n-type semiconducting behavior at elevated temperatures. The presence of a highly polarizable phase for all compositions is revealed by electric modulus (M″) spectra. The Burns temperature decreases with increasing KNN content. The change in temperature-dependent permittivity with composition is explained by the difference in thermal evolution of polar nanoregions induced by the addition of KNN.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 97
Number: 5
Divisions: 11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences
Date Deposited: 19 May 2014 10:41
Official URL: http://dx.doi.org/10.1111/jace.12804
Identification Number: doi:10.1111/jace.12804
Funders: Deutsche Forschungsgemeinschaft. Grant Number: RO 954/22
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