Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Densification and Dielectric Properties of Ba0.5Sr0.5TiO3-Glass Composites for LTCC Applications

  • Shin, Hyun-Ho (Department of Advanced Ceramic Materials Engineering, Gangneung-Wonju National University) ;
  • Byun, Tae-Hun (Department of Advanced Ceramic Materials Engineering, Gangneung-Wonju National University) ;
  • Yoon, Sang-Ok (Department of Advanced Ceramic Materials Engineering, Gangneung-Wonju National University)
  • Received : 2011.08.04
  • Accepted : 2011.12.05
  • Published : 2012.01.31
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Abstract

Barium zincoborate (BZB) glass was added to $Ba_{0.5}Sr_{0.5}TiO_3$, and sintered at $875^{\circ}C$ for 2 h in air. When the BZB glass was added in quantities ranging from 15 to 20 wt%, the relative bulk density ranged from 93.1% to 94.2%, while the density decreased to roughly 81% thereafter up to 30 wt% glass addition. Quantitative XRD analysis showed that the $Ba_{0.5}Sr_{0.5}TiO_3$ filler was significantly dissolved into the BZB glass. However, no secondary phase was identified by XRD up to 30 wt% glass addition. The dielectric constant was about 130 to 140 at 1MHz up to 20 wt% BZB glass addition, while it decreased to about 60 thereafter, which may be ascribed to decreased density, partial dissolution of the $Ba_{0.5}Sr_{0.5}TiO_3$, and associated changes in the glass composition. The dielectric loss of the 20 wt% glass added specimen was 0.008.

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