The Korean Journal of Ceramics

The Korean Ceramic Society (한국세라믹학회)
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Particle Size Effects on Microstructure Evolution and Microwave Dielectric Characteristics in $0.93MgTiO_3-0.07CaTiO_3$Ceramics

  • Lee, Jung-A (Department of Inorganic Materials Engineering, Kyungpook National University) ;
  • Kim, Jeong-Joo (Department of Inorganic Materials Engineering, Kyungpook National University) ;
  • Kim, Nam-Kyong (Department of Inorganic Materials Engineering, Kyungpook National University) ;
  • Cho, Sang-Hee (Department of Inorganic Materials Engineering, Kyungpook National University) ;
  • Hahn, Jin-Woo (Electronics and Telecommunications Research Institute)
  • Published : 1999.09.01
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Abstract

Effect of the particle size of $MgTiO_3$ and $CaTiO_3$ on the microstructural evolution during sintering of $0.93MgTiO_3-0.07CaTiO_3$ system was investigated. Microwave dielectric characteristics of the sintered ceramics were also measured. The microstructural evolutions were explained with an emphasis on the entrapping behavior of $CaTiO_3$ grain into the $MgTiO_3$ grain and were correlated with microwave dielectric characteristics. With an increasing particle size ratio between $CaTiO_3$and $MgTiO_3$, the fraction of entraped $CaTiO_3$ grains increased, which grain growth of $MgTiO_3$were concurrently accelerated due to decreasing drag force of its boundary migration. Besides, $CaTiO_3$-grain entrapment into the $MgTiO_3$grain interior led to decreaseing quality factor values.

Keywords

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