Process for prorducing thallium-containing high-T.sub.c superconductors in flowing gas atmospheres

US5801126A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Marc Neubacher · Frankfurt am Main, DE
• Steffen Elschner · Heidelberg, DE
• Christoph Lang · Palo Alto, US
• Christoph Teske · Kiel, DE
• Hans Karl Mueller-Buschbaum · Kiel, DE

Key dates

• Filing date: Sep 17, 1996
• Grant date: Sep 1, 1998
• Expiry date: Sep 17, 2016

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10N60/0268
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The process for producing high-T.sub.c superconductors containing thallium, calcium, barium and copper, possibly also lead and/or strontium, provides for a thallium-free precursor to be produced in a first reaction step and this to be then mechanically triturated, subsequently heated to temperatures in the range from 700.degree. to 950.degree. C. and heat treated for a period of at least 3 hours. The mixture is then cooled to ambient temperature and ground again. Finally, it is heat treated at temperatures of from 400.degree. to 500.degree. C. in a stream of pure oxygen. The thallium-free precursor is then triturated with Tl.sub.2 O.sub.3, if desired shaped into a shaped part and then oxidatively fired in a flowing gas atmosphere.