Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Characteristics of La0.2Ca0.8MnO3 Powder and Pellet Prepared by Sol-Gel Process

졸-겔법으로 합성한 La0.2Ca0.8MnO3의 분말과 펠렛의 특성

  • Jung, Miewon (Department of Chemistry, Sungshin Women's University) ;
  • Lee, Jiyun (Department of Chemistry, Sungshin Women's University) ;
  • Kim, Hyunjung (Department of Chemistry, Sungshin Women's University)
  • Received : 2004.07.08
  • Accepted : 2004.10.26
  • Published : 2005.02.10
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Abstract

$La_{0.2}Ca_{0.8}MnO_3$ colossal magnetoresistance (CMR) powders and pellets were synthesized by sol-gel process involving a stable metal chelate complex with acetylacetone. The structural changes of reaction mixture were monitored by FT-IR spectroscopy and X-ray diffractometry. The microstructure of sintered samples and the cation composition of gel powder were studied by FE-SEM/EDS and ICP-AES. The magnetic property was investigated as a function of temperature.

아세틸아세톤이 치환된 금속-킬레이트 착물에 polyethylene glycol를 첨가시켜 안정하고 균일한 졸 용액을 얻은 뒤, 페로보스카이트 $La_{0.2}Ca_{0.8}MnO_3$의 분말과 펠렛을 합성하였다. 반응과정에 대한 구조변화를 FT-IR과 XRD 분석기로 추적하였고, 입자 크기와 균일도를 살펴보았다. 그리고 온도의 함수로서의 자기적 특성도 관찰하였다.

Keywords

Acknowledgement

Supported by : 성신여자대학교

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