Method of producing a material of oxide superconductor with reduced impurities

摘要

A method of producing an oxide for the manufacture of an oxide superconductor is disclosed. The method comprises the steps ionizing a solution (21) of the oxide, removing the solvent by spraying (12) the solution (21) in a first atmosphere (14) to produce a powder (1a) and then cooling the powder in a second atmosphere (16) into which a cooling gas is introduced. The concentration of carbon dioxide in the second atmosphere (16) is lower than that in the first atmosphere (14). The concentration of nitrogen oxide in the second atmosphere (16) is lower than that in the first atmosphere (14). The concentration of water vapour in the second atmosphere (16) is lower than that in the first atmosphere (14). This results in an oxide (1) substantially free of impurities.