Characterization of a Large-Scale Nondoped YBa^sub 2^Cu^sub 3^O^sub 7-x^ Superconductor Prepared by Plastic Forming Without High-Pressure Molding

• Published in: Journal of the American Ceramic Society Vol. 90; no. 7; p. 2032
• Main Authors: Takahashi, Makoto, Tomioka, Yuuko, Miyauchi, Toshiyuki, Sato, Shoji
• Format: Journal Article
• Language: English
• Published: Columbus Wiley Subscription Services, Inc 01.07.2007
• Subjects: Ceramics; Diffraction; Electric resistance; Molds & molding; NMR; Nuclear magnetic resonance; Solution chemistry; Superconductors; Temperature
• ISSN: 0002-7820; 1551-2916

A slurry containing ...-particles and a fine ... colloid solution was prepared, and a large-scale bulk ...- superconductor (about 50 mm x 35 mm x 2 mm) was produced by plastic forming without high-pressure molding. The samples molded from the slurry were dried and then fired at 1223 K in air. X-ray diffraction data indicated that the samples had the characteristic orthorhombic ...-structure. Measurements of electrical resistance were carried out between 300 and 50 K by the standard four-probe DC electrical measurement. The samples began superconducting at an onset temperature around 92 K, and the full-transition temperature (critical temperature) (...) was 88.7±1.4 K. The critical current density (...) measured at 77 K was about 440 ..., the value of ... was improved by the heat treatment under an oxygen atmosphere, and ... was observed. Under the magnetic field (B=1 T), the sample held its superconductivity, and demonstrated that this method can be used to produce the magnetic shielding used in magnetic resonance imaging diagnosis. (ProQuest-CSA LLC: ... denotes formulae/symbols omitted.)