The Structural and Microwave Dielectric Properties of the BMT Ceramics with Sintering Temperature and BCN Composition Ratio

소결온도와 BCN 초성에 따른 BMT 세라믹스의 구조 및 마이크로파 유전특성

  • 최의선 (광원대학 전자재료공학과) ;
  • 이문기 (광원대학 전자재료공학과) ;
  • 류기원 (여주대학 전자과.) ;
  • 이성갑 (서남대학 전자전기공학부.) ;
  • 이영희 (광운대학 전자재료공학과.)
  • Published : 2002.07.01

Abstract

The microwave dielectric properties of Ba(Mg$_{1}$3/Ta$_{2}$3/O$_3$-Ba(Co$_{1}$3/Nb$_{2}$3/O$_3$[BMT-BCN] ceramics were investigated. The specimens were prepared by the conventional mixed oxide method with the sintering temperature of 15$25^{\circ}C$~1575$^{\circ}C$. It was found that Ba(Mg$_{1}$3/Ta$_{2}$3/O$_3$[BMT] and BCN formed a solid solution with complex perovskite structure. As increasing the mole fraction of BCN, dielectric constant increased while the temperature coefficient of resonant frequency was changed from positive to negative value. The highest value of quality factor, Q$\times$f$_{0}$=138,205GHz, obtained in the 0.9BMT-0.1BCN ceramics sintered at 1575$^{\circ}C$. In the range of x$\geq$0.4, the dielectric constant was about 30. The 0.55BMT-0.45BCN ceramics sintered at 15$25^{\circ}C$ for 5 hours showed the microwave dielectric properties of $\varepsilon$$_{r}$=30.21, Q$\times$f$_{0}$=85,789GHz and $\tau$$_{f}$=2.9015ppm/$^{\circ}C$.EX>.

Keywords

Quality factor(Q${\times}$f$_{}$ 0/);Dielectric constant($\varepsilon$$_{}$ r/);Complex perovskite structure;Temperature coefficient of resonant frequency($\tau$$_{}$ f/)

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