Brookhaven Science Associates, Lcc

Harold Wiesmann

Vyacheslav Solovyov

This invention provides a method of making a fluorinated precursor of a superconducting ceramic. The method comprises providing a solution comprising a rare earth salt, an alkaline earth metal salt and a copper salt; spraying the solution onto a substrate to provide a film-covered substrate; and heating the film-covered substrate in an atmosphere containing fluorinated gas to provide the fluorinated precursor.

Fluorinated precursors of superconducting ceramics, and methods of making the same

The present invention is a method for producing a crystalline end-product. The method comprising exposing a fluoride-containing precursor to a hydrogen fluoride absorber under conditions suitable for the conversion of the precursor into the crystalline end-product.

Methods of controlling hydrogen fluoride pressure during chemical fabrication processes

The present invention is a method of forming thick films of crystalline YBa Cu O that includes forming a precursor film comprising barium fluoride (BaF ), yttrium (Y) and copper (Cu). The precursor film is heat-treated at a temperature above 500&deg; C. in the presence of oxygen, nitrogen and water vapor at sub-atmospheric pressure to form a crystalline structure. The crystalline structure is then annealed at about 500&deg; C. in the presence of oxygen to form the crystalline YBa Cu O film. The YBa Cu O film formed by this method has a resistivity of from about 100 to about 600 &mgr;Ohm-cm at room temperature and a critical current density measured at 77 K in a magnetic field of 1 Tesla of about 1.0&times;10 Ampere per square centimeter (0.1 MA/cm ) or greater.

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Stony Brook, NY, United States of America

Harold Wiesmann