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Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Based High-Temperature Dielectrics

Zang, Jiadong and Li, Ming and Sinclair, Derek C. and Frömling, Till and Jo, Wook and Rödel, Jürgen and Johnson, D. (2014):
Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Based High-Temperature Dielectrics.
In: Journal of the American Ceramic Society, pp. 2825-2831, 97, (9), ISSN 00027820, [Online-Edition: http://dx.doi.org/10.1111/jace.13012],
[Article]

Abstract

The dielectric properties of CaZrO3 (CZ) modified 0.94Bi1/2Na1/2TiO3 (BNT)–0.06BaTiO3 (BT) and 0.82(0.94BNT–0.06BT)–0.18(K1/2Na1/2)NbO3 have been investigated by impedance spectroscopy over a wide temperature range. The presence of a highly polarizable phase in addition to a bulk response is revealed by electric modulus (M″) spectra in both systems. The relaxation frequency of the polar phase follows the Vogel–Fulcher law below the Burns temperature which decreases with increasing CZ content. The dc conductivity of the ceramics is dominated by the bulk response which follows the Arrhenius law with an activation energy ranging from 1.4 to 1.7 eV and has an oxygen partial pressure dependence consistent with n-type semiconductivity. This information is pertinent to on-going compositional development of relaxor-based high-temperature dielectrics.

Item Type: Article
Erschienen: 2014
Creators: Zang, Jiadong and Li, Ming and Sinclair, Derek C. and Frömling, Till and Jo, Wook and Rödel, Jürgen and Johnson, D.
Title: Impedance Spectroscopy of (Bi1/2Na1/2)TiO3-BaTiO3Based High-Temperature Dielectrics
Language: English
Abstract:

The dielectric properties of CaZrO3 (CZ) modified 0.94Bi1/2Na1/2TiO3 (BNT)–0.06BaTiO3 (BT) and 0.82(0.94BNT–0.06BT)–0.18(K1/2Na1/2)NbO3 have been investigated by impedance spectroscopy over a wide temperature range. The presence of a highly polarizable phase in addition to a bulk response is revealed by electric modulus (M″) spectra in both systems. The relaxation frequency of the polar phase follows the Vogel–Fulcher law below the Burns temperature which decreases with increasing CZ content. The dc conductivity of the ceramics is dominated by the bulk response which follows the Arrhenius law with an activation energy ranging from 1.4 to 1.7 eV and has an oxygen partial pressure dependence consistent with n-type semiconductivity. This information is pertinent to on-going compositional development of relaxor-based high-temperature dielectrics.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 97
Number: 9
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 08 Sep 2014 09:19
Official URL: http://dx.doi.org/10.1111/jace.13012
Identification Number: doi:10.1111/jace.13012
Funders: Deutsche Forschungsgemeinschaft. Grant Number: RO 954/22, Engineering and Physical Sciences Research Council. Grant Number: EP/G005001/1
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