Microstructural feature of nanophase Sn-Bi particles produced by an electrohydrodynamic technique

Sn-Bi nanometer powders were produced by an electrohydrodynamic technique. The microstructural feature of Sn-Bi nanometer powders was investigated by means of XRD, TEM and HREM. The results show that Sn-Bi nanometer powders p roduced are composed of tetragonal beta-Sn monophase supersaturated solid s olution and rhombohedral Bi monophase supersaturated solid solution. Most o f the Sn-Bi nanometer powders are single crystals, only a few Sn-Bi nanomet er powders are twin crystals. The particles of < 10 nm in diameter are perf ect single crystals. There exist dislocations in the particles larger than 10 nm in diameter. The formation mechanism of microstructure for Sn-Bi nano meter powders is analyzed.