MgB₂ superconducting films prepared by the aerosol deposition method

Titelangaben

Glosse, Philipp ; Denneler, Stefan ; Kauffmann-Weiss, Sandra ; Oomen, Marijn ; Moos, Ralf:
MgB₂ superconducting films prepared by the aerosol deposition method.
2016
Veranstaltung: 6th International Congress on Ceramics (ICC6) , 21.-25.08.2016 , Dresden, Deutschland.
(Veranstaltungsbeitrag: Kongress/Konferenz/Symposium/Tagung , Vortrag )

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Abstract

Magnesium diboride (MgB2) is a promising superconductor with working temperatures below 39 K. Several techniques are known to prepare MgB2 films, filaments or wires. The powder-in-tube technique is used commercially to produce multifilament conductors from in situ or ex situ prepared MgB2 powders. Physical vapor deposition is appropriate to coat substrates with MgB2 thin film. The Aerosol Deposition Method (ADM) is a spray-coating technique at room temperature used to produce films of brittle materials, mostly ceramics like Al2O3. Due to its ceramic-like mechanical properties, MgB2 can be deposited with this technique as well. For the ADM, fine powders with a particle size range between 0.1 to 10 μm are used as starting powders. A defined aerosol of these powders and a carrier gas is accelerated into a vacuum chamber. As soon as the particles collide with the substrate, they crack and a fine-grained film forms. Thus ADM thick films are mostly dense nanocrystalline coatings, where various materials can work as a substrate. In this study MgB2 films are formed by the ADM on substrates like glass, Al2O3, and nickel base alloys. Processing parameters and powder treatment strongly affect film thicknesses and the morphology of the as-deposited films. The film thickness of the first samples was about 5 μm. The influence of aerosol parameters like carrier gas type, gas flow and aerosol concentration is evaluated based on the quality of the deposited MgB2.