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Curie Temperature and Tunable Dielectric Properties of Barium Strontium Titanate Thick Films

티탄산 바륨 스트론튬 (BaxSr1-xTiO3) 후막의 상전이온도와 가변 유전특성

  • Jeon, So-Hyun (Department of Materials Engineering, Kyungnam University) ;
  • Kim, In-Sung (Electric and Magnetic Devices Group, Korea Electrotechnology Research Institute) ;
  • Min, Bok-Ki (Electric and Magnetic Devices Group, Korea Electrotechnology Research Institute) ;
  • Song, Jae-Sung (Electric and Magnetic Devices Group, Korea Electrotechnology Research Institute) ;
  • Yoon, Jon-Do (Department of Materials Engineering, Kyungnam University)
  • 전소현 (경남대학교 재료공학과) ;
  • 김인성 (한국전기연구원 전자기소자연구그룹) ;
  • 민복기 (한국전기연구원 전자기소자연구그룹) ;
  • 송재성 (한국전기연구원 전자기소자연구그룹) ;
  • 윤존도 (경남대학교 재료공학과)
  • Published : 2006.07.01

Abstract

[ $(BaSr)TiO_3$ ] thick films were prepared by tape casting method, using $BaTiO_3\;and\;SrTiO_3$ powder slurry in order to investigate dielectric properties i.e. dielectric constant, ${\varepsilon}_r$, Curie temperature, $T_c$. Grain growth within $(BaSr)TiO_3$ thick films was observed with increasing weight ratio of $BaTiO_3$. This observation can be explained by phenomena of substitution of $Sr^{2+}$ ion for $Bi^{2+}$ ion in the $BaTiO_3$ system. Also, the Curie temperature in $(BaSr)TiO_3$ thick films was shifted to lower temperature range with increasing $ SrTiO_3$. Furthermore, Curie temperature having maximum dielectric constant was in the range of $-40^{\circ}C\;to\;30^{\circ}C$, and hence sharper phase transformation occurred at Curie temperature. There occurred decrease in tunability and k-factor of $(Ba_{0.6}Sr_{0.4})TiO_3$ calculated from the dielectric constant, ${\varepsilon}_r$ above Curie temperature. In addition, above the $60^{\circ}C$, phase fixation was observed. This means that internal stress relief occurred with increasing $90^{\circ}$ domains.

Keywords

References

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