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Integrated Ferroelectrics
An International Journal
Volume 39, 2001 - Issue 1-4
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Section J: Materials and processing high frequency devices

Dielectric properties and tunability of BST and BZT thick films for microwave applications

Michael Voigts Institut fur Werkstoffe der Elektrotechnik (IWE) Universität Karlsruhe (TH), Adenauerring 20, 76131, Karlsruhe
,
Wolfgang Menesklou Institut fur Werkstoffe der Elektrotechnik (IWE) Universität Karlsruhe (TH), Adenauerring 20, 76131, Karlsruhe
&
Ellen Ivers-Tiffee Institut fur Werkstoffe der Elektrotechnik (IWE) Universität Karlsruhe (TH), Adenauerring 20, 76131, Karlsruhe
Pages 383-392 | Received 14 Mar 2001, Published online: 03 Sep 2006
 
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Abstract

Dielectric properties and tunability of Ba0.60Sr0.40TiO3 (BST) and BaZr0.25Ti0.75O3 (BZT) thick films and bulk ceramics have been investigated as a function of temperature (90 K - 320 K) in the kHz region. Thick films show compared to bulk ceramics low permittivity and a very broad ferroelectric phase transition which leads to low temperature dependence of tunability. Tunability of 30% can be achieved with an external field of 2 kV/mm. Measurements in the microwave region adumbrate that the dielectric losses of BZT are about three times higher than that of BST thick films.

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