Properties of Ultrafine High Curie Temperature (1-x)BiScO_3-xPbTiO_3 Ferroelectric Ceramics

摘要

Ultrafine (1-x)BiScO_-xPbTiO_ ferroelectric ceramics were successfully prepared by employing nanocrystalline ceramic powder. The average ceramic grain sizes range from 0.4 mu m to 1.2um with different phases and different proceeds. The studies show the average grain sizes vary with the calcining and sintering temperature as well as the compositions in different phases. Ceramics, sintered at 1020 deg C for 3h, in morphotropic phase boundary (MPB) have the smallest grain sizes around 0.4 urn, those in tetragonal phase and rhombohedral phase have larger grains around 0.9um. Meanwhile, the piezoelectric property and Curie temperature were founded size-dependent when the grain sizes are smaller than1 mu m.