Preparation of Superconducting Y–Ba–Cu–O and Bi–Pb–Sr–Ca–Cu–O Compounds by Chelating Method

概要

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Superconducting Y–Ba–Cu–O (YBCO) and Bi–Pb–Sr–Ca–Cu–O (BPSCCO) compounds were prepared by a chelating method with various chelating agents, such as nitrilotriacetic acid (NTA), hydroxyethylethylenediaminetriacetic acid (HEDTA) and ethylenediaminetetraacetic acid (EDTA). Above 600°C, the precursors YBCO and BPSCCO turned into a mixture of metal oxides and BaCO3, which finally transformed into the almost single phase of YBCO at $850\sim 930$°C and into the high-$T_{\text{c}}$ phase of BPSCCO at 840°C. The critical current densities of YBCO and BPSCCO in blocks of 1$*$4$*$15 mm3 were estimated to be as high as 350 and 500 A/cm2 at 77 K, respectively.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
1989-08-20