전기학회논문지 (The Transactions of The Korean Institute of Electrical Engineers)

  • 제56권3호
  • /
  • Pages.556-560
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  • 2007
  • /
  • 1975-8359(pISSN)
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  • 2287-4364(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
권호 표지

소결온도에 따른 $Mg_5B_4O_{15}$ (B=Ta, Nb)세라믹스의 구조 및 마이크로파 유전특성

Structural and Microwave Dielectric Properties of the $Mg_5B_4O_{15}$ (B=Ta, Nb) Ceramics with Sintering Temperature

  • 이승준 (광운공대 전자재료공학과) ;
  • 김재식 (광운공대 전자재료공학과) ;
  • 이성갑 (경상대학 세라믹공학과) ;
  • 이영희 (광운공대 전자재료공학과)
  • 발행 : 2007.03.01
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초록

In this study, both structural and microwave dielectric properties of the $Mg_5B_4O_{15}$ (B=Ta, Nb) cation-deficient perovskite ceramics with sintering temperature were investigated. All sample of the $Mg_5B_4O_{15}$ (B=Ta, Nb) ceramics were prepared by the conventional mixed oxide method and sintered at $1400^{\circ}C{\sim}1500^{\circ}C$. The bulk density and quality factor of the $Mg_5B_4O_{15}$ (B=Ta, Nb) ceramics were increased with increasing sinterning temperature in the range of $1400^{\circ}C{\sim}1450^{\circ}C$, but these were decreased the sintering temperature of above $1450^{\circ}C$. The dielectric constant of the $Mg_5Ta_4O_{15}$ ceramics was increased continuously with increasing sintering temperature. And the dielectric constant of the $Mg_5Nb_4O_{15}$ ceramics was increased in as the sintering temperature increasesfrom $1400^{\circ}C{\sim}1450^{\circ}C$ but was decreased at the temperatures above $1475^{\circ}C$. In the case of the $Mg_5Ta_4O_{15}\;and\;Mg_5Nb_4O_{15}$ ceramics sintered at $1450^{\circ}C$ for 5h, the dielectric constant, quality factor, and temperature coefficient of the resonant frequency (TCRF) were 8.2, 259,473 GHz, $-10.91ppm/^{\circ}C$ and 14, 37,350 GHz, $-52.3ppm/^{\circ}C$, respectively.

키워드

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