Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Microwave Dielectric Properties of BaNd2Ti5O14−BaO−B2O3-K2O-SiO2-xTiO2 Glass Composites

BaO-B2O3-SiO2-K2O-xTiO2 Glass의 첨가에 의한BaNd2Ti5O14-Glass 복합체의 마이크로파 유전특성

  • 김동은 (요업(세라믹)기술원 기능소재팀) ;
  • 이성민 (요업(세라믹)기술원 기능소재팀) ;
  • 김형태 (요업(세라믹)기술원 기능소재팀) ;
  • 김형순 (인하대학교 세라믹공학부)
  • Published : 2007.02.28
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Abstract

The effects of $TiO_2$ in the glasses on the shrinkage and dielectric properties of BNT-glass composites have been investigated. Without $TiO_2$ addition, BNT-glass composite showed two humps in the shrinkage curve, which are related with crystallization of $BaTi(BO_3)_2\;and\;Bi_4Ti_3O_{12}$. However, the increase of $TiO_2$ addition resulted in the decrease of 2nd hump in the shrinkage. The increased dielectric constant with $TiO_2$ addition might be due to the reduced crystallization of $Bi_4Ti_3O_{12}$. A dielectric constant of 52, a quality factor of 5088 GHz, and a temperature coefficient of resonant frequency of $-0.16ppm/^{\circ}C$ were obtained for a specimen containing $TiO_2$-added glasses, without sacrificing the benefits of high ${\varepsilon}_r$ and low TCF of BNT ceramics.

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References

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