The processing and properties of ferroelectric thick films for use in frequency agile microwave circuit applications

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Abstract

Barium strontium titanate (BST) thick films for use in frequency agile microwave circuit applications have been investigated. A potentially cost-effective processing route has been used to make BST thick films from mixed-oxide powders. BST thick films have been press-formed in a single step onto alumina substrates from a viscous polymer tape. Films with thicknesses ranging from 10 to 140 mum have been obtained. The microstructure and dielectric properties of the BST thick films have been characterised. The results show that Ba0.7Sr0.3TiO3 thick films exhibit similar to 20% tunability at room temperature under a DC bias field of 5.5 kV/cm. Possibilities for further improvements are discussed in terms of reducing the interactions between the BST films and alumina substrates. (C) 2001 Elsevier Science Ltd. All rights reserved.

Details

Original languageEnglish
Pages (from-to)2641-2645
Number of pages5
JournalJournal of the European Ceramic Society
Volume21
Publication statusPublished - 1 Jan 2001

Keywords

  • BST, dielectric properties, processing, thick films