Y-Ba-Cu-O 계에서 123상의 성장에 미치는 Sn의 효과를 관찰하기 위하여 Sn이 첨가된 123+Sn성형체와 Sn이 첨가되지 않은 123성형체와의 couple시편을 만들었다. $1100^{circ}C$에서 24시간 유지한 후 $970^{circ}C$에서 1시간 유지한 시편에서 123상은 Sn이 첨가된 123+Sn 성형체의 표면에서부터 생성되어 Sn이 첨가되지 않은 123성형체 내부쪽으로 성장하였다. $1100^{circ}C$에서 48시간 유지한 후 $970^{circ}C$에서 1시간 유지한 시편에서는 123상이 관찰되지 않았으며 Y-Ba-Sn으로 구성된 결정립이 관찰되었다.
In order to investigate the effect of $SnO_2$ on the growth of 123 phase in Y-Ba-Cu-0 system, O.1Sn-doped 123+Sn compact was coupled with Sn-free 123 compact by placing the former on the latter. In case of the coupled samples which were held at $1100^{circ}C$ for 24hr and then at $970^{circ}C$ for lhr, 123 phase grew from the surface of O.1Sn-doped 123+Sn compact toward the inner of Sn-free 123 compact. In case of the coupled samples which were held at $1100^{circ}C$ for 48hr and then at $970^{circ}C$ for lhr, it was not the 123 phase but Ba-Y-Sn grains that were observed. Ba-Y-Sn grains with a shape of bar was composed of Ba : Y : Sn=5 : 3 : 2, approximately.
