Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Crystal Growth of Superconducting Y-Ba-Cu-O by Flux Technique

융제법에 의한 Y-Ba-Cu-O 초전도체의 단결정 육성

  • 박승익 (서울대학교 무기재료공학과) ;
  • 박현민 (서울대학교 무기재료공학과) ;
  • 정수진 (서울대학교 무기재료공학과) ;
  • 박병규 (산업 과학 기술 연구소) ;
  • 박병학 (산업 과학 기술 연구소)
  • Published : 1989.01.01
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Abstract

Single crystals of the superconducting Y-Ba-Cu oxide were grown by a flux technique. Stoichiometric mixture with excess BaO and CuOcontent was melted at 130$0^{\circ}C$, followed by fast cooling to 108$0^{\circ}C$ to prevent crystallizing of CuO. It was then reheated to 110$0^{\circ}C$ followed by being held at this temperature to control the number of nuclei, and cooled by 5$^{\circ}C$/hr to 80$0^{\circ}C$. This procedure was repeated with various compositions and crystals were obtained in cavity. Molten solution was seperated to two parts : the upper part of almost CuO and the rest of different composition. Appropriate composition of flux was 30mol% BaO and 70mol% CuO due to the seperation of molten solution. Single crystals have the habit of thin plate with good developed (001) crystal face, XRD, EDAX and single crystal X-ray investigations were carried out. The grown crystals have tetragonal structure with the lattice parameters a=b=3.84$\AA$, c=11.7$\AA$, and the space group P4/mmm. The crystal surface were observed by SEM.

Keywords

References

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