Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Low Temperature Synthesis of the Microwave Dielectric (Pb0.5Ca0.5)(Fe0.5Nb0.5)O3 Nano Powders by the Metal-citrate Process

Metal-citrate Process를 이용한 마이크로파 유전체용 (Pb0.5Ca0.5)(Fe0.5Nb0.5)O3 나노 분말의 저온 합성

  • Lee, Dong-Wook (Department of Ceramic Engineering, Hanyang University) ;
  • Won, Jong-Han (Department of Ceramic Engineering, Hanyang University) ;
  • Shim, Kwang-Bo (Department of Ceramic Engineering, Hanyang University) ;
  • Kang, Seung-Gu (Department of Materials Engineering, Kyunggi University) ;
  • Hyun, Boo-Sung (Nano Ceramics Center, Korea Institute of Ceramic Engineering & Technology)
  • 이동욱 (한양대학교 세라믹공학과) ;
  • 원종한 (한양대학교 세라믹공학과) ;
  • 심광보 (한양대학교 세라믹공학과) ;
  • 강승구 (경기대학교 재료공학과) ;
  • 현부성 (요업기술원 나노세라믹센터)
  • Published : 2002.01.01
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Abstract

Nano sized $(Pb_{0.5}Ca_{0.5})(Fe_{0.5}Nb_{0.5})O_3$ (PCFN) powders with the stoichiometric composition and the uniform size distribution were successfully synthesized by the metal-citrate process through the calcination of the polymeric precursor which consisted of the metal ions and the organic network. The crystallization of the initial amorphous powders began at $400{\circ}$ and completed at $700{\circ}$. The pyrochlore phase was detected caused by the dissociation of PbO above $900{\circ}$. Single phase perovskite PCFN powders with 40 nm size and uniform shape were obtained through the calcination at $700{\circ}$.

마이크로파 유전체용 $(Pb_{0.5}Ca_{0.5})(Fe_{0.5}Nb_{0.5})O_3$ (PCFN) 나노 분말을 metal-citrate 공정을 이용하여 합성하였다. 금속 이온들과 유기 조직의 결합으로 이루어진 고분자 전구체를 형성시키고 이를 열처리하여 화학양론적 조성과 균일한 크기 분포를 갖는 PCFN 분말을 성공적으로 합성하였다. 초기 비정질상 PCFN 분말은 약 $400{\circ}$에서부터 결정화가 시작되어 $700{\circ}$에서 완전한 결정화를 이루었고, $900{\circ}$ 이상에서는 PbO의 해리로 인한 pyrochlore상이 생성되었다. $700{\circ}$에서 열처리된 단일상의 perovskite PCFN 분말은 약 40 nm의 평균 크기와 균일한 형상으로 분포되어 있었다.

Keywords

References

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