Dielectric Properties of Hipped (Sr, Ba)TiO3 FGM Ceramics

概要

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(Sr, Ba)TiO3 FGM (Functionally Gradient Material) ceramics were fabricated by hot isostatic pressing to obtain flat temperature dependence of dielectric constant with a large value in a wide range of temperature. The FGM compacts were prepared by stack of each green compact with different composition and were fully densified by hipping at 1200°C for 1 h under 200 MPa. Dielectric constant of the hipped FGM was about 3400 in the temperature range of 10∼50°C. Application of high pressure (200 MPa) at low temperature (900°C) and then heating up to 1200°C, a flat temperature range of dielectric constant were over wide (-5∼80°C) and grain size of hipped FGM was remarkably suppressed compared with the FGM fabricated by conventional hipping process. Using fine powders prepared by sol-gel process as raw materials, dielectric constant was obtained about 3600 and was constant over the wide range of temperature (0∼90°C).
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