BiFeO3-BaTiO3 Method for preparing BiFeO3-BaTiO3 ceramics having improved piezoelectric and ferroelectric properties and lead-free piezoelectric ceramics prepared thereby

摘要

The invention (a) Bi ₂ 0 ₃ powder, Fe ₂ 0 ₃ to prepare a powder, BaC0 ₃ powder and Ti0 mixed raw material powder containing the _second powder; (B) the step of sintering the shaped body after the manufacturing using a mixed raw material powder prepared in the above step (a), 940 to 1100 ℃; And (c) comprising the step of cooling the obtained sintered bodies in the above step (b), the interval including a temperature range of 447 to less than 767 ℃ in step (c), characterized in that for performing the rapid cooling (quenching) BiFeO provides a method of producing ₃ -BaTiO ₃ ceramics. The method of manufacturing a lead-free piezoelectric ceramic according to the present invention is configured to be capable of rapidly cooling a piezoelectric ceramic having a temperature of 940 to 1100 ℃ after sintering at a temperature of from 20 to 30 ℃ in a short time (5 to 30 minutes), BiFeO ₃ 447 to by avoiding a temperature range of less than 767 ℃ in a short time, a lattice distortion in the ceramic is formed indicates the characteristics to reduce the leakage current, a high phase transition temperature without the use of manganese or copper as a sintering aid and the piezoelectric represents the unstable phase there is an effect showing a.;