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Synthesis and Dielectric Properties of LaAIO3 Ceramics with Grinding Methods

분쇄방식에 따른 LaAIO3 세라믹의 합성과 유전특성

  • 조정호 (부경대학교 전자공학과) ;
  • 최상수 (부경대학교 전자공학과) ;
  • 김강언 (부경대학교 전자공학과) ;
  • 정수태 (부경대학교 전자공학과) ;
  • 조상희 (경북대학교 무기재료공학과)
  • Published : 2002.03.01

Abstract

The dielectric properties and synthesis of $LaAIO_3$ ceramics from mixtures of $La_2O_3$ and $AI(OH)_3$ via ground(planetary ball mill) and unground(wet ball mill) were investigated. The single phase $LaAIO_3$ of ground powder was formed at $1000^{\circ}C$, while that of unground powder was formed at $1300^{\circ}C$. Density and grains of ground sample showed 98% of theory density and a uniform size of 0.75\mu\textrm{m}$, respectively, However those of unground sample showed 93% and non-uniform sizes of 4-5 $\mu\textrm{m}$. Dielectric constant and temperature coefficient of capacitance ($\tau$c) of both ground and unground samples were 21~22 and +70~74 ppm$/^{\circ}C$, respectively. Dielectric loss of ground sample(0.0004) was 10 times as low as that of unground sample(0.003) due to a uniform and small gram size.

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