Synthesis and Characterization of High-T_c Superconducting Oxides by the Modified Citrate Gel Process

概要

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High-T_c superconducting Y-Ba-Cu-O, Bi-Ca-Sr-Cu-O, and Tl-Ca-Ba-Cu-O materials were synthesized using a modified citrate precursor process. Ethylenediamine was used to neutralize the metal citrate solution and facilitate the complex formation. Highly homogeneous and viscous gel without any precipitation was obtained. In the Tl-Ca-Ba-Cu-O system, the Ca-Ba-Cu-O precursor was first prepared by the sol-gel method, then mixed with thallium oxide for final sintering. The complex formation was monitored by UV/VIS spectrophotometry. The thermal decomposition of gels and the formation of superconducting phases had been studied using IR, DTA, TGA, and XRD. This process is highly reproducible and leads to powders with excellent homogeneity and small particle size for easy sinterability.
社団法人応用物理学会の論文
1989-12-20