REACTIVE NANOPHASE OXIDE ADDITIONS TO MELT-PROCESSED HIGH-T-C SUPERCONDUCTORS

2020-03-25 13:17:08

AT powders oxide nanophase additions

责任者: GORETTA, KC;BRANDEL, BP;LANAGAN, MT;HU, JG;MILLER, DJ;SENGUPTA, S;PARKER, JC;ALI, MN;CHEN, N 单位: NANOPHASE TECHNOL CORP,DARIEN,IL 60561.;ILLINOIS SUPERCONDUCTOR CORP,EVANSTON,IL 60201. 来源出处: IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, v 5, JUN 1995, p 1309- 1312 摘要: Nanophase TiO2 and Al2O3 powders were synthesized by a vapor-phase process and mechanically mixed with stoichiometric YBa2Cu3Ox and TlBa2Ca2Cu3Ox powders in 20 mole% concentrations. Pellets produced from powders with and without nanophase oxides were heated in air or O-2 above the peritectic melt temperature and then slowly cooled. At 4.2 K, the intragranular critical current density (J(c)) increased dramatically with the oxide additions. At 35-50 K, effects of the oxide additions were positive, but less pronounced. At 77 K, the additions decreased J(c), probably because they depressed the transition temperature. 关键词: MOLYBDENUM OXIDE; PYRIDINE; MOLYBDIC ACID; CURRENT-DENSITY; YBA2CU3OX; TAPES; PHASE