PROCESS FOR PRODUCING OXIDE SUPERCONDUCTORS

摘要

An oxide powder having a uniform composition and a fine particle size and capable of being sintered at low temperature can be obtained at a temperature not higher than the boiling point of a solvent by forming fine superconductive oxide particles in a liquid phase according to the sol-gel process using alkoxides of a plurality of metallic elements constituting superconductive oxides as starting materials. An oriented film with good superconductive properties can be obtained by providing an interlayer composed of an oxide film between a base and the superconductive oxide upon forming the superconductive oxide film on the base using the powder. A strongly c-axis oriented superconductive film and a superconductive bulk can be prepared from a Ln-Ae-Cu-O or Bi-Ae-Cu-O material with a specific composition ratio. The superconductive film is obtained by applying a paste of these materials on a base, and heating it. The superconductive bulk is obtained by pressing in a given direction superconductive crystals precipitated by sintering these materials.