Accession Number : ADA266173


Title :   Properties of Bi2Sr2CaCu2O8 Thick Films Melt-Processed at Temperatures up to 950 C


Corporate Author : NAVAL COMMAND CONTROL AND OCEAN SURVEILLANCE CENTER RDT AND E DIV SAN DIEGO CA


Personal Author(s) : McGinnis, W C ; Briggs, J S


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a266173.pdf


Report Date : Mar 1992


Pagination or Media Count : 9


Abstract : Thick Bi2Sr2CaCu208 films have been produced by melting Bi2Sr2CaCu208 Powder on MgO substrates at temperatures just above the melting temperature of the powder. X-ray diffraction measurements indicate enhanced c-axis alignment throughout the thickness of the films. Films melted at 900 deg. C show greater alignment and contain less Bi2Sr2Cu0 compared to those processed at 950 deg. C. Both the degree of alignment and the Bi2Sr2Cu06 content increase as the cooling rate is decreased. Transport measurements show that films quickly cooled from low melt-processing temperatures have the highest critical current densities (J (Sub c ) = 13 kA/Sq cm at 30 K). The temperature dependence of J (Sub c ) is best described by a flux creep model. Finally, J (Sub c ) at 4.2 K (in both parallel and perpendicular magnetic fields) undergoes a sudden drop at low fields, but levels off above 0.5 T to about 30% of the zero field value.... Superconductivity, Thin films, Transformer.


Descriptors :   *CALCIUM , *OXIDES , *COPPER , *THICK FILMS , *BISMUTH , *STRONTIUM , REPRINTS , MEASUREMENT , TEMPERATURE , THICKNESS , MAGNETIC FIELDS , MODELS , POWDERS , PROCESSING , THIN FILMS , X RAY DIFFRACTION , FILMS , RATES , MELTS , CURRENT DENSITY , SINGLE CRYSTALS , SUBSTRATES , MAGNESIUM OXIDES , TRANSFORMERS , SUPERCONDUCTIVITY , VALUE , CREEP , TRANSPORT , MELTING , DROPS , COOLING , ALIGNMENT , DIFFRACTION


Subject Categories : Physical Chemistry
      Electrical and Electronic Equipment
      Electricity and Magnetism
      Solid State Physics


Distribution Statement : APPROVED FOR PUBLIC RELEASE