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Preparation and Characterization of LaAlO3 Ceramics from High Energy Ball Milling Powders

고에너지 볼 밀에 의한 LaAlO3 세라믹스의 제조와 특성

  • 최상수 (동명정보공업고등학교 정보전자과) ;
  • 서병준 (부경대학교 전자공학과) ;
  • 여기호 (부경대학교 전자공학과) ;
  • 정수태 (부경대학교 전자공학과)
  • Published : 2004.01.01

Abstract

Fine LaAlO$_3$ powders wore successfully synthesized from La$_2$O$_3$ and ${\gamma}$ $Al_2$O$_3$ powders milling for 10∼50 hours via the high energy milling technique (mechanochemical method) in room temperature and air. The particle size of LaAlO$_3$ powder were estimated from XRD patterns and SEM images to be 160∼180 nm. The LaAlO$_3$ ceramics arc derived for the synthesized powders (milling for 10, 30 and 50 hours) by sintering at 140$0^{\circ}C$ and 150$0^{\circ}C$. The micrographs of grains showed an agglomeration and the degree of agglomeration increased with the milling time. The LaAlO$_3$ made from synthesized powders milling for 50 hours can be sintered to 99.5% of theoretical density at 150$0^{\circ}C$ for 1 hour. These ceramics exhibits a dielectric constant of 20, a dielectric loss of 0.0003 and a temperature coefficient of capacitance of 15 ppm/$^{\circ}C$ at 1 MHz.

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