Transactions on Electrical and Electronic Materials

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Influence of Yb2O3 Doping Amount on Screen-printed Barium Strontium Calcium Titanate Thick Films

  • Noh, Hyun-Ji (Department of Ceramic Engineering, Eng. Res. Inst., i-Cube Center, Gyeongsang Natiional University) ;
  • Lee, Sung-Gap (Department of Ceramic Engineering, Eng. Res. Inst., i-Cube Center, Gyeongsang Natiional University) ;
  • Ahn, Byeong-Lib (Department of Electrical Engineering, Hanyang University) ;
  • Lee, Ju (Department of Electrical Engineering, Hanyang University)
  • Published : 2007.12.31
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Abstract

[ $(Ba_{0.9-x}Sr_xCa_{0.10})TiO_3$ ] (x=0.33, 0.36) powders were prepared by sol-gel method. $(Ba,Sr,Ca)TiO_3$(BSCT) thick films, undoped and doped with $MnCO_3$ and $Yb_2O_3(0.1{\sim}0.7mol%)$, were fabricated by the screen printing method on the alumina substrate. The coating and drying procedure was repeated 6-times. The Pt bottom electrode was screen printing method on the alumina substrate. These BSCT thick films were annealed at $1420^{\circ}C$ for 2 hr in atmosphere. The upper electrodes were fabricated by screen printing the Ag paste and then firing at $590^{\circ}C$ for 10 min. And then the structured and dielectric properties as a function of the doping amount of $Yb_2O_3$ were studied. As a result of the TG-DTA, exothermic peak was observed at around $670^{\circ}C$ due to the formation of the polycrystalline perovskite phase. All BSCT thick films showed XRD patterns of typical cubic peroveskite structure. The average thickness of BSCT thick films was about $70^{\mu}m$. The curie temperature and the dielectric constant decreased with increasing $Yb_2O_3$ doped content and the relative dielectric constant of the specimen, doped with 0.5 mol% $Yb_2O_3$ at BSCT(54/36/10), showed a best value of 5018 at curie temperature.

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References

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