KIM, DJ KROEGER, DM 2024-01-21T22:15:27Z 2024-01-21T22:15:27Z 2022-01-11 1993-09-01 0022-2461 https://pubs.kist.re.kr/handle/201004/145984 YBa2Cu3O7-x (YBCO) superconductor powder was prepared from mixtures of solutions containing yttrium, barium, and copper nitrates by coprecipitation in oxalic acid. Single-phase YBCO was obtained from a solution mixture of 14 vol % excess of barium nitrate and 12 vol % excess of copper nitrate relative to the stoichiometry of YBCO. The optimal pH in the coprecipitation process was determined to be 6.6-6.7 which was obtained by using 12 vol % excess oxalic acid anhydrous solution of the required oxalic acid to convert all metal cations to oxalates and adding a dilute ammonium hydroxide solution. The measurement of critical current density, J(c), of bulk YBCO prepared by the coprecipitation, showed a trend that the J(c) increased together with the degree of orthorhombic distortion of YBCO phase which depended on the sample density and the content of impurity phases. English CHAPMAN HALL LTD TRANSPORT CRITICAL CURRENT YBA2CU3OX SUPERCONDUCTORS OXIDE SUPERCONDUCTORS GRAIN-BOUNDARIES Y1BA2CU3OX POWDER SIZE BA2YCU3O7-X TEMPERATURE SAMPLES OPTIMIZATION OF CRITICAL-CURRENT DENSITY OF BULK YBCO SUPERCONDUCTOR PREPARED BY COPRECIPITATION IN OXALIC-ACID Article 10.1007/BF00414267 1 JOURNAL OF MATERIALS SCIENCE, v.28, no.17, pp.4744 - 4748 JOURNAL OF MATERIALS SCIENCE 28 17 4744 4748 scie scopus A1993LW17400028 2-s2.0-0027656833 Materials Science, Multidisciplinary Materials Science Article TRANSPORT CRITICAL CURRENT YBA2CU3OX SUPERCONDUCTORS OXIDE SUPERCONDUCTORS GRAIN-BOUNDARIES Y1BA2CU3OX POWDER SIZE BA2YCU3O7-X TEMPERATURE SAMPLES