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Microwave Dielectric Properties of Ca[(Li1/3Nb2/3)0.2Ti0.8]O3-δ Ceramics with Addition of Zn-B-O Glass Systems

Zn-B-O 글라스 첨가에 의한 Ca[(Li1/3Nb2/3)0.2Ti0.8]O3-δ 세라믹스의 마이크로파 유전특성

  • In, Chi-Seung (Department of Materials Science and Engineering, Korea University) ;
  • Kim, Shi Yeon (Department of Materials Science and Engineering, Korea University) ;
  • Yeo, Dong-Hun (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Shin, Hyo-Soon (Engineering Ceramic Center, Korea Institute of Ceramic Engineering & Technology) ;
  • Nahm, Sahn (Department of Materials Science and Engineering, Korea University)
  • 인치승 (고려대학교 신소재공학부) ;
  • 김시연 (고려대학교 신소재공학부) ;
  • 여동훈 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 신효순 (한국세라믹기술원 엔지니어링세라믹센터) ;
  • 남산 (고려대학교 신소재공학부)
  • Received : 2016.10.31
  • Accepted : 2016.11.11
  • Published : 2016.12.01

Abstract

With trend of the miniaturization and the high-functionalizing of mobile communication system, low-loss microwave dielectric materials are widely used for high frequency communication components. These dielectric materials should be co-sintered with highly electric-conducting metal such as silver or copper for high-frequency and thick film process application. Sintering temperature of $Ca(Li_{1/3}Nd_{2/3})_{0.2}Ti_{0.8}]O_{3-{\delta}}$, which has excellent dielectric properties such as ${\varepsilon}_r$ above 40, quality factor ($Q{\cdot}f_0$) above 16,000 GHz, and TCF (temperature coefficient of resonant frequency) of $-20{\sim}-10ppm/^{\circ}C$, is reported as high as $1,175^{\circ}C$, so it could not be co-sintered with silver or copper. Therefore in this study, low-temperature melting glasses of Zn-B-O and Zn-B-Si-O systems were added to $Ca[(Li_{1/3}Nb_{2/3})_{0.8}Ti_{0.2}]O_{3-{\delta}}$ to lower its sintering temperature under $900^{\circ}C$ without losing excellency of dielectric properties. With 15 weight % of Zn-B-Si-O glass and sintered at $875^{\circ}C$, specimen showed density of $4.11g/cm^3$, ${\varepsilon}_r$ of 40.1, $Q{\cdot}f_0$ of 4,869 GHz, and TCF of $-5.9ppm/^{\circ}C$. With 15 weight % of Zn-B-O glass and sintered at $875^{\circ}C$, specimen showed density of $4.14g/cm^3$, ${\varepsilon}_r$ of 40.4, $Q{\cdot}f_0$ of 7,059 GHz, and TCF of $-0.92ppm/^{\circ}C$.

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