Journal of the Korean Crystal Growth and Crystal Technology (한국결정성장학회지)

The Korea Association of Crystal Growth (한국결정성장학회)
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Electrical properties and microstructure of microwave dielectric ceramics (Ca0.7Sr0.3)m(TiyZr1-y)O3

고주파 유전체 세라믹 (Ca0.7Sr0.3)m(TiyZr1-y)O3의 전기적 특성 및 미세구조

  • Chun, Myoung-Pyo (Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Park, Myoung-Sung (Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Kang, Kyung-Min (Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Nam, Joong-Hee (Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Cho, Jeong-Ho (Korea Institute of Ceramic Engineering and Technology (KICET)) ;
  • Kim, Byung-Ik (Korea Institute of Ceramic Engineering and Technology (KICET))
  • Published : 2010.02.28
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Abstract

The effects of mole ratio(A/B) m and Ti-ion on the dielectric properties and microstructure of the microwave dielectric ceramics $(Ca_{0.7}Sr_{0.3})_m(Ti_yZr_{1-y})O_3$ were investigated. Ti ions substituted on Zr-sites in these modified $CaZrO_3$ composition strongly affect the sintering density and microstructure of the fired ceramic body. With increasing the amount of Ti substituted on Zr-sites, the sintered density rapidly increased and the dense microstructure was obtained for the compositions having mole ratio of 1.01, whereas the sintered density and microstructure are nearly constant with the content of Ti-ion for the compositions having mole ratio of 0.99. With increasing the content of Ti ion, the curve of TCC (Temperature Coefficient of Capacitance) as a function of temperature rotated clockwise and satisfied the COG characteristics for both of compositions with mole ratio of 0.99 and 1.01. The content of Ti ion seems to be more effective than mole with respect to the controlling of firing and TCC.

고주파 유전체 세라믹 $(Ca_{0.7}Sr_{0.3})_m(Ti_yZr_{1-y})O_3$ 의 미세구조 및 전기적 특성에 대한 Ti 이온 및 몰비의 영향을 조사하였다. $CaZrO_3$의 Zr 위치에 Ti 이온의 치환은 세라믹 소체의 소결밀도 및 미세구조에 큰 영향을 미친다. Zr 위치에 Ti 이온의 치환량 증가에 따라, 소결밀도는 급격히 증가하고, 몰비 m=1.01에서 치밀한 미세조직이 얻어졌다. 한편, 몰비 m=0.99 조성에 대해서는 Ti 치환량이 증가하여도 소결밀도 및 미세구조는 거의 변화가 없이 일정하였다. Ti 치환량 증가에 따라 TCC (temperature coeITicient of capacitance) 곡선은 시계방향으로 회전하여 몰비 m=0.99, 1.01 조성에 대해 COG 특성을 만족하였다. $CaZrO_3$의 TCC 및 소결특성 제어를 위해서는 Ti 치환량이 몰비보다는 효과적임을 보여준다.

Keywords

References

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