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

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.