Accession Number : ADD017370

Title :   Low Temperature Synthesis of YBa2Cu3O(8-X) and Other Crystalline Oxides.

Descriptive Note : Patent Filed 2 Aug 93, patented 27 Dec 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Covino-Hrbacek, Josephine

Report Date : 27 Dec 1994

Pagination or Media Count : 4

Abstract : Process for preparing a high temperature superconductor such as yttrium barium copper oxides, by dissolving suitable proportions of hydrolyzable salts, oxides, or organometallic compounds of yttrium, barium and copper in an acid pH-controlled water-containing organic solvent such as methanol, and subjecting the resulting solution to ultrasonic energy or to an oxidation reduction reaction, preferably while passing oxygen under a positive pressure through the solution, and precipitating a hydrolyzed precursor material. Such precursor material is then heated or annealed at temperatures between about 300 deg C. and about 600 deg C., also preferably in the presence of flowing oxygen, to produce the desired high temperature superconductor material. jg

Descriptors :   *LOW TEMPERATURE, *CRYSTALS, *OXIDES, *HIGH TEMPERATURE SUPERCONDUCTORS, *PATENTS, SOLUTIONS(MIXTURES), SYNTHESIS, MATERIALS, PRECURSORS, SUPERCONDUCTORS, ENERGY, ORGANOMETALLIC COMPOUNDS, OXYGEN, ULTRASONICS, RESPONSE, METHANOLS, PRESSURE, BARIUM, COPPER OXIDES, OXIDATION REDUCTION REACTIONS, YTTRIUM OXIDES

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Electrical and Electronic Equipment
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE