Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Phase Formation Characteristics of Superconducting $YBa_2Cu_3O_{7-x}$ Prepared by the Melt-Textured Growth

용융-조직 성장에 의한 초전도성 $YBa_2Cu_3O_{7-x}$상의 생성 특성

  • 장현명 (포항공과대학 재료·금속공학과 산업과학기술연구소 무기재료연구분야) ;
  • 문길원 (전남대학교 금속공학과)
  • Published : 1990.05.01
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Abstract

Melt-textured growth of the YBa2Cu3O7-x phase from a supercooled melt created locally aligned, barshaped grains of the orthorhombic 1-2-3 phase. Based on all the observed phenomena, the gross mechanism of the melt-textrued growth of YBa2Cu3O7-x on the (100) plane of MgO was delineated by three basic patterns of reactions. These are : (ⅰ) formation of the aligned 1-2-3 phase and the Y-rich 2-1-1 phase at the bulk region away from the (100) plane of MgO ; (ⅱ) formation of the Cu-richprecipitates at the interfacial region by the selective interface-induced precipitation of the liquid phase ; (ⅲ) condensation reaction of the entrapped Cu-rich vapor with Mg atoms during the initial stage of rapid cooling from 130$0^{\circ}C$ to 98$0^{\circ}C$.

Keywords

References

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