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  4. Microstructure and electric properties of CaCu3Ti4O12 multilayer capacitors
 
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2015
  • Zeitschriftenaufsatz

Titel

Microstructure and electric properties of CaCu3Ti4O12 multilayer capacitors

Abstract
In a three-step development process CaCu3Ti4O12-based bulk ceramic pellets, tape-casted multilayer ceramic laminates, and multilayer ceramic capacitors with cofired electrodes were fabricated. The sintering behavior, microstructure, electrical resistivity, and dielectric properties were studied. At a firing temperature of 1050°C, an effective permittivity of about e' = 60 000 and 10 000 was observed for sintered pellets and multilayer laminates, respectively. The typical grain growth observed in pellets is suppressed in multilayer laminates. Impedance spectroscopy was employed to show that the bulk grain resistivity is similar in pellets and multilayer laminates, but the grain-boundary resistivity is higher in pellets. Tapes were processed into multilayer capacitors with Ag/Pd electrodes and cofired at 1050°C. All three types of samples, pellets, laminates, and capacitors were also processed with a glass additive, in which case they can be cofired at a lower temperature of 900°C. In glass-containing pellets, the temperature dependence of permittivity is weak and exhibits X7R characteristics for frequencies below ≈ 60 kHz. Our results demonstrate the high potential of CaCu3Ti4O12 for application in monolithic as well as in integrated multilayer capacitors.
Author(s)
Löhnert, Romy
Ernst-Abbe-Hochschule Jena, Fachbereich SciTec
Bartsch, Heike
TU Ilmenau, Fakultät für Elektrotechnik und Informationstechnik
Schmidt, Rainer
Universidad Complutense de Madrid, Department of Applied Physics
Capraro, Beate
Fraunhofer-Institut für Keramische Technologien und Systeme IKTS
Töpfer, Jörg
Ernst-Abbe-Hochschule Jena, Fachbereich SciTec
Zeitschrift
Journal of the American Ceramic Society
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DOI
10.1111/jace.13260
Language
Englisch
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Tags
  • ceramic capacitors

  • grain boundaries

  • grain growth

  • effective permittivit...

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