Al2O3 particles =30 nm in size were added to Bi2Sr2CaCu2Ox in a 1:4 molar ratio. For comparison, 0.3- and -3- im AI2O3 particles were added to separate batches. All of the materials were partial-melt processed. The A12O3 reacted during melting to form stable compounds, primarily of approximate composition (Sr,Ca)2A 1 O 4. All additions caused slight decreases in the Tc and melting point of the Bi2Sr2CaCu2Ox. The submicrometer AljOj additions induced large expansions in magnetic-hysteresis width at 6 K. Electron microscopy examination strongly suggested that the hysteresis expansion was related to alloying of the Bi2Sr2CaCu2Ox matrix rather than to pinning by volume defects.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering