一方向凝固した超伝導YBCO/Ag複合体中のAgおよびY<SUB>2</SUB>BaCuO<SUB>5</SUB>の分布

DOI Web Site Web Site 被引用文献2件 参考文献15件

書誌事項

タイトル別名
  • Distribution of Ag and Y<SUB>2</SUB>BaCuO<SUB>5</SUB> in Superconducting YBCO/Ag Composite Fabricated by Unidirectional Solidification
  • 一方向凝固した超伝導YBCO/Ag複合体中のAgおよびY2BaCuO5の分布
  • 1ホウコウ ギョウコシタ チョウデンドウ YBCO Ag フクゴウタイチュウ

この論文をさがす

抄録

The distribution of 211(Y2BaCuO5) and Ag particles in the columnar 123(YBa2Cu3O7−x) crystal of YBCO/Ag composites solidified unidirectionally was investigated to clarify the peritecto-monotectic solidification mechanism. The fabricated 123 crystal has a faceted cell and a band structure of 211 particles at the center of the cell, because of radial solute diffusion layer at the cell tip where 211 particles can’t sufficiently dissolve into the melt. Ag-free region was also formed at the same central region of the 123 cell by pushing of Ag particles, which sizes are under a critical radius (rc), by the 123 growth interface. The relation between r0 and growth rate Ri (: the following Ra or Rc) of faceted planes was given by the equation: Ri=0.52⁄rc. In the Ag added hyperperitectic YBCO, the amount of the 211 particles in the 123 phase was larger in the Ag-rich region than in the Ag-free region because the amount of 123 phase in the Ag-rich region was smaller than that in the Ag-free region. Therefore, the distribution of 211 particles in the 123 phase takes a duplicated structure. The growth direction of the cell tip was obtained by analyzing the above band structures of Ag-free regions or 211-rich regions which correspond to the growth trace of cell edges. From the measured crystallographic orientation of the cell, the relation between Ra, Rc and R are Ra(Rb)=0.66R and Rc=0.54R, where R (μm/s), Ra, and Rc (μm/s) are macro-growth rate of each faceted plane, respectively.

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 62 (6), 563-569, 1998

    公益社団法人 日本金属学会

被引用文献 (2)*注記

もっと見る

参考文献 (15)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ