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Fluorinated Precursors of Superconducting Ceramics

Brookhaven National Laboratory

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	Structure of superconducting YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub></p>

Structure of superconducting YBa2Cu3O7

Technology Marketing Summary

Fluorinated precursors for superconducting ceramics typically increase the critical current in the superconductors they produce. Here the fluorinated precursors are obtained by combining salts of a rare earth, an alkaline earth, and copper in solution, spraying the solution onto a substrate, and heating the covered substrate in a fluorine-containing atmosphere. This is accomplished without the use of trifluoroacetates or physical deposition techniques. The method is suitable for producing superconducting powders and superconducting ceramics on various substrates with reduced cracking.


Fluorinated precursor films, Y-BaF2-Cu, are deposited on substrates using vacuum coevaporation of Cu, Y, and BaF2 at ambient temperature. Fluxes are independently controlled to yield an elemental composition of Y1.4Ba2Cu3 for the films at a combined deposition rate of 10 nm/s. During the deposition a flux of water vapor is additionally directed at the substrate to partially oxidize the yttrium in the precursor films. After the deposition the precursor films are annealed for 1 hour at 400°C in an atmosphere of water vapor, oxygen, and nitrogen. Precursor films may then be converted to superconducting YBCO in a process-gas mixture at subatmospheric pressures.


These precursors lead to superconducting tapes and wires with very high critical current densities and very uniform normal-state properties.

Applications and Industries

High-temperature superconductors, high-critical-current superconductors, tapes and wires of high-temperature superconductors

More Information

Solovyov, et al., “Critical current densities and the structural quality of 3- and 4-µm-thick superconducting YBa2Cu3O7 layers synthesized using the ex situ process,” J. Appl. Phys. 102, 053902 (2007) doi:10.1063/1.2773997

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Patent 7,361,377
Fluorinated precursors of superconducting ceramics, and methods of making the same
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.
Brookhaven National Laboratory 04/22/2008
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BSA 03-01PrototypeAvailable01/09/201404/29/2011

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To: Avijit Sen<>