抄録
An oxygen-controlled melt growth (OCMG) process has been employed for NdBa2Cu3Oy (Nd123) and SmBa2Cu3Oy (Sm123) superconductors for a comparative study. Both Nd123 and Sm123 samples melt-grown in reduced oxygen atmospheres exhibited an enhanced superconducting transition temperature (TC) with a sharp transition and large critical current density (JC) in a high field region at 77 K and for the applied field parallel to the c-axis of samples (H//c). For Nd123, a preferential formation of high Tcphase in a low oxygen partial pressure (PO2) could be qualitatively described considering the thermodynamic stability boundaries of the Nd1+xBa2-xCu3Oy solid solutions on the LOG[PO2] vs 1/T (K-1) phase diagram. A long-term oxygen annealing study for an OCMG-processed Nd123 sample revealed that the annealing temperature should be as low as 300°C.
| 本文言語 | English |
|---|---|
| ページ（範囲） | 1568-1571 |
| ページ数 | 4 |
| ジャーナル | IEEE Transactions on Applied Superconductivity |
| 巻 | 5 |
| 号 | 2 |
| DOI | |
| 出版ステータス | Published - 1995 6月 |
| 外部発表 | はい |
ASJC Scopus subject areas
- 電子材料、光学材料、および磁性材料
- 凝縮系物理学
- 電子工学および電気工学