Nanophase TiO2 and A1203 powders were synthesized by a vapor-phase process and mechanically mixed with stoichiometric YBa2Cu3Ox and TlBa2C a 2C u 3 O x powders in 20 mole% concentrations. Pellets produced from powders with and without nanophase oxides were heated in air or O2 above the peritectic melt temperature and then slowly cooled. At 4.2 K, the intragranular critical current density (Jc) 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 Jc, probably because they depressed the transition temperature.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering