High-Tc superconductors-based nanocomposites with improved intergrain coupling and enhanced bulk pinning

Heterogeneous sonochemical synthesis was used to modify superconducting properties of granular YBa₂Ca₃CuO_7-δ and Bi₂Sr₂CaCu₂O_8+x. Sonication of liquid-powder alkane slurries produces material with enhanced intergrain coupling and improved current-carrying capabilities. Co-sonication with metals and organometallics results in highly compact nanocomposites with increased magnetic irreversibility. Ultrasonic irradiation of YBa₂Ca₃CuO_7-δ carried under partial oxygen atmosphere produces similar morphological effects and increases superconducting transition temperature due to effective surface saturation with oxygen. Detailed chemical and physical characterization of sonochemically prepared high-T_c nanocomposites is presented.