Preparation of (Ba,Sr)TiO3 Thick Films with Ni Electrodes by Screen Printing

概要

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The effects of doping MgO into (Ba0.6Sr0.4)TiO3 (BST) fired under a reducing atmosphere were investigated in order to prepare BST thick films with Ni electrodes by the screen-printing method. MgO-doped BST thick films fired under a reducing atmosphere showed insulation resistance. Grain growth in the thick films was advanced by MgO doping. The dielectric constant near $T_{\text{C}}$ of the bulk ceramics and thick films increased with increasing MgO concentration up to 2 and 10 mol %, respectively. Mg ion substitution to the $B$-site was also observed up to these concentrations. The tunability and $\tan\delta$ of thick films with MgO concentrations of 2 and 4 mol % at an electric field of 10 V/μm were approximately 77 and 0.3%, respectively. It is expected that thick films prepared by screen printing will be applicable to tunable devices with Ni electrodes.
2010-09-25