Synthesis of Ba2YCu3O7–δ Superconductor through Organometallic Route

• Published in: Bulletin of the Chemical Society of Japan Vol. 62; no. 3; pp. 888 - 892
• Main Authors: Hirano, Shin-ichi, Hayashi, Takashi, Miura, Masashi, Tomonaga, Hiroyuki
• Format: Journal Article
• Language: English
• Published: Tokyo The Chemical Society of Japan 01.03.1989; Chemical Society of Japan
• Subjects: Chemistry; Elements and non-metal compounds (oxides, hydroxides, hydrides, sulfides, carbides, ...); Exact sciences and technology; Inorganic chemistry and origins of life; Preparations and properties; High temperature superconductor
• ISSN: 0009-2673; 1348-0634
• DOI: 10.1246/bcsj.62.888

The chemical synthesis of a high-Tc Ba2YCu3O7–δ superconductor was investigated through the organometallic route, using Ba metal, Y(OPri)3, and Cu–alkoxides or Cu–acetylacetonate as starting materials. Chemically homogeneous submicron powders of single phase Ba2YCu3O7–δ were successfully prepared at 750 °C by controlled partial hydrolysis of metal alkoxides. The utilization of ozone for favorable decomposition of Ba2YCu3O7–δ precursors was found to have a remarkable effect on suppressing the formation of BaCO3 and lowering the formation temperature of Ba2YCu3O7–δ to about 650 °C. The single phase Ba2YCu3O7–δ ceramics exhibited superconductivity at approximately 83 K (Tc end).