High temperature “Hard” piezoelectric ceramics of BiScO3-PbTiO3-Pb(Nb, Mn)O3 with Fe2O3 addition

摘要

“Hard” piezoelectric materials of Fe modified 0.37BiScO-0.6PbTiO-0.03Pb(MnNb)O (BS-PT-PMN-Fe) ceramics were prepared by traditional solid state reaction method. X-ray diffraction (XRD) analysis revealed that BS-PT-PMN-Fe ceramics showed single perovskite structure with dominant tetragonal phase, and the c/a ratios was enlarged with Fe content. The grain size of BS-PT-PMN-Fe ceramics decreased obviously from 25 to 1 μm with the increase of Fe content from 0 to 3 mol%. The dielectric and piezoelectric properties of BS-PT-PMN-Fe ceramics with 2 mol% Fe addition are as follows: ε = 600, tanδ = 0.008, d = 240, Q = 500, and k = 0.38, which were comparable to those of PZT-4 traditional “hard” piezoelectric ceramics. Both piezoelectric and dielectric properties were stable from room temperature up to 400 °C, about 250 °C higher than those of conventional PZT piezoelectric ceramics. In addition, the temperature coefficient of resonance frequency (TCF) of ceramics with 3 mol% Fe addition was -21 ppm/°C, which is one tenth that of PZT ceramics.