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Bismuth Pyrochlore Based Dielectric Thin Films for Tunable Applications
Keywords: Dielectric tunable, Bismuth pyrochlore, Thin films
Tunable dielectric thin films have been widely investigated for microwave tunable device applications, such as phase shifters, tunable filters, varactors etc. Low dielectric loss, high tunability and reasonable dielectric constant are required for such applications. Many efforts have been made to meet above requirements. A composite structure is one of the effective approaches. A composite film is composed of different compositions and provides an opportunity to tailor and optimize the properties of the dielectric films. Recently, cubic Bi1.5ZnNb1.5O7 (BZN) pyrochlore dielectric has been found to be dielectric-tunable by an electric field. The BZN exhibits very low dielectric loss and moderate dielectric constant. Meanwhile, barium strontium titanate (Ba1−xSrxTiO3 or BST) thin films have been intensively studied for tunable devices due to their high dielectric tunability. Its expected that introducing BZN in BST films to form BST/BZN composite films will reduce dielectric loss and dielectric constant of BST films and meanwhile keep high tunability. This talk will report on the fabrication, structures, dielectric properties and tunability of the BZN based composite thin films. Several novel composite approaches have been investigated to enhance tunability and figure of merit. The dielectric relaxation and dielectric tunable behavior will be discussed.
Wei Ren, Professor
Xi'an Jiaotong University
Xi'an, Shaanxi 710049,

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