Patents

The invention discloses a process for the preparation of nano-sized to sub-micron-sized (Bao.96Cao.04) (Sno.ioTio.9o)03 nanofibers. The invention consists of the preparation of a homogeneous acetate salt solution of BCST in polyvinyl pyrrolidone and ethyl alcohol. The homogeneous solution was electrospun to generate composite fibers/nanofibers of PVP + BCST acetate. The composite fibers were heat treated at 1150°C for 2 hours to expel the organic phase leaving pure BCST nanofibers. SEM study shows the diameter of as spun fibers are in the range of 70nm to 275 nm and the diameter of heat-treated nanofibers are in the range of 50nm to 210 nm. A pellet was made from calcined nanofibers, sintered at 1250°C, poled and the properties such as piezoelectric constant (das), dielectric constant (K) and remnant polarization (Pr) are 398 pC/N, 3432, 7.97 µC/cm2 respectively