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High-temperature dielectrics in CaZrO3-modified Bi1/2Na1/2TiO3-based lead-free ceramics

Acosta, Matias and Zang, Jiadong and Jo, Wook and Rödel, Jürgen (2012):
High-temperature dielectrics in CaZrO3-modified Bi1/2Na1/2TiO3-based lead-free ceramics.
In: Journal of the European Ceramic Society, Elsevier Science Publishing Company, pp. 4327-4334, 32, (16), ISSN 09552219, [Online-Edition: http://dx.doi.org/10.1016/j.jeurceramsoc.2012.06.011],
[Article]

Abstract

Materials in two composition regimes, Bi1/2Na1/2TiO3–BaTiO3–CaZrO3 (BNT–BT–CZ) and Bi1/2Na1/2TiO3–BaTiO3–K0.5Na0.5NbO3–CaZrO3 (BNT–BT–KNN–CZ), were synthesized via the mixed oxide route and their structural, dielectric and electrical properties were investigated. CZ was identified to render the two local maxima in permittivity more diffused. This resulted in temperature-insensitive relative permittivity spectra with average values from ∼470 up to ∼2300 and operational windows of at least ∼400 °C with less than 15% of variation in the temperature range from −100 up to above 500 °C. Moreover, loss factors are below ∼10% and RC constants range from ∼0.03 s up to ∼4 s at 300 °C. The materials of current investigation are highly attractive for developing capacitors of wide temperature usage.

Item Type: Article
Erschienen: 2012
Creators: Acosta, Matias and Zang, Jiadong and Jo, Wook and Rödel, Jürgen
Title: High-temperature dielectrics in CaZrO3-modified Bi1/2Na1/2TiO3-based lead-free ceramics
Language: English
Abstract:

Materials in two composition regimes, Bi1/2Na1/2TiO3–BaTiO3–CaZrO3 (BNT–BT–CZ) and Bi1/2Na1/2TiO3–BaTiO3–K0.5Na0.5NbO3–CaZrO3 (BNT–BT–KNN–CZ), were synthesized via the mixed oxide route and their structural, dielectric and electrical properties were investigated. CZ was identified to render the two local maxima in permittivity more diffused. This resulted in temperature-insensitive relative permittivity spectra with average values from ∼470 up to ∼2300 and operational windows of at least ∼400 °C with less than 15% of variation in the temperature range from −100 up to above 500 °C. Moreover, loss factors are below ∼10% and RC constants range from ∼0.03 s up to ∼4 s at 300 °C. The materials of current investigation are highly attractive for developing capacitors of wide temperature usage.

Journal or Publication Title: Journal of the European Ceramic Society
Volume: 32
Number: 16
Publisher: Elsevier Science Publishing Company
Uncontrolled Keywords: Dielectric properties; Electrical conductivity; Ferroelectric properties; Capacitors; Relaxor
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: 27 Sep 2012 07:45
Official URL: http://dx.doi.org/10.1016/j.jeurceramsoc.2012.06.011
Identification Number: doi:10.1016/j.jeurceramsoc.2012.06.011
Funders: This research was graciously supported by the Leibniz program of the Deutsche Forschungsgemeinschaft under RO 954/22-1.
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