Phase Formation Characteristics of Superconducting <TEX>$YBa_2Cu_3O_{7-x}$</TEX> Prepared by the Melt-Textured Growth

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J. Korean Ceram. Soc. > Volume 27(5); 1990 > Article

Journal of the Korean Ceramic Society 1990;27(5): 677.

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

장현명, 문길원¹

포항공과대학 재료·금속공학과 산업과학기술연구소 무기재료연구분야
¹전남대학교 금속공학과

Phase Formation Characteristics of Superconducting $YBa_2Cu_3O_{7-x}$ Prepared by the Melt-Textured Growth

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$0^{circ}C$.