Accession Number : ADA292478

Title :   Synthesis and Characterization of CuO Superconductors with High Transition Temperatures.

Descriptive Note : Technical rept. 1 Jun 93-30 Nov 94,

Corporate Author : WAYNE STATE UNIV DETROIT MI

Personal Author(s) : Wenger, Lowell E. ; Chen, J. T.

PDF Url : ADA292478

Report Date : 31 JAN 1995

Pagination or Media Count : 48

Abstract : This final technical report describes the continual superconductivity research on the materials and structural phases responsible for the above 200-K superconducting transitions, their synthesis conditions, and the study of the physical properties associated with these transitions. Resistive transitions having superconducting-like character have been observed in multi-phase ceramic YBaCu0 samples and on surfaces of nominal YBa2Cu3O7 single crystals in the temperature range of 260 K to 340 K. The appearance of these transitions appears to require certain experimental measuring conditions including and oxygen atmosphere during measurements. Magnetization studies on these materials show a flux-trapping hysteretic behavior at similar temperatures, i.e., a more diamagnetic behavior in the zero-field-cooled- magnetization than the field-cooled-magnetization, which is characteristic of a weak superconducting phase being present. The synthesis conditions and structural information on multi-phase YBaCuO samples exhibiting reproducible flux-trapping phenomenon at 336 K is also detailed. jg

Descriptors :   *HIGH TEMPERATURE, *SUPERCONDUCTORS, *TRANSITION TEMPERATURE, *COPPER OXIDES, MEASUREMENT, TEMPERATURE, SYNTHESIS, PHYSICAL PROPERTIES, STRUCTURAL PROPERTIES, COMPOSITE MATERIALS, SINGLE CRYSTALS, PHASE, OXYGEN, CERAMIC MATERIALS, RANGE(EXTREMES), MAGNETIZATION, LOW STRENGTH, BARIUM, HYSTERESIS, ATMOSPHERES, SUPERCONDUCTIVITY, YTTRIUM, DIAMAGNETISM.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Electricity and Magnetism
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE