Massachusetts Institute of Technology

John A Smith

Neville Sonnenberg

Michael John Cima

Michael I Cima

An oxide superconductor article is provided having an oxide superconductor film having a thickness of greater than 0.5 microns disposed on a substrate, said article having a transport critical current density (J ) of greater than or equal to about 10 A/cm at 77K, zero field. The oxide superconductor film is characterized by high J and high volume percent of c-axis epitaxial oxide grains, even with thicknesses of up to 1 micron. The oxide superconductor article is prepared by providing a metal oxyfluoride film, said metal oxyfluoride film comprising the constituent metallic elements of an oxide superconductor in substantially stoichiometric proportions; and converting the metal oxyfluoride into the oxide superconductor at a rate of conversion selected by adjusting a reaction parameter selected from the group consisting of temperature, P , P , and time and combinations thereof, such that an oxide superconductor film having a transport critical current density of greater than or equal to about 10 A/cm at 77K, zero field is obtained.

Controlled conversion of metal oxyfluorides into superconducting oxides

An oxide superconductor article is provided having an oxide superconductor film having a thickness of greater than 0.5 microns disposed on a substrate, said article having a transport critical current density (J,) of greater than or equal to about 10,A/cm,at 77 K, zero field. The oxide superconductor film is characterized by high J,and high volume percent of c-axis epitaxial oxide grains, even with thicknesses of up to 1 micron. The oxide superconductor article is prepared by providing a metal oxyfluoride film, said metal oxyfluoride film comprising the constituent metallic elements of an oxide superconductor in substantially stoichiometric proportions; and converting the metal oxyfluoride into the oxide superconductor at a rate of conversion selected by adjusting a reaction parameter selected from the group consisting of temperature, P,, P,, and time and combinations thereof, such that an oxide superconductor film having a transport critical current density of greater than or equal to about 10,A/cm,at 77 K, zero field is obtained.

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Nashua, NH, United States of America

John A Smith