B-site-doped BiFeO3-based piezoceramics with enhanced ferro/piezoelectric properties and good temperature stability

Here, B-site doped 0.725BiFe(0.98)M(0.02)O(3)-0.275BaTiO(3)(M = Fe, Sc, Ga, and Al) + 0.8 mol% MnO2(abbreviated as BF, BS, BG, and BA) (BFM-BT) ceramics were designed and prepared to modulate octahedral distortions. According to bond-valence calculations based on XRD Rietveld refinement data, B-site doped BFM-BT ceramics tended to have a higher distortion as the radius of the doping ion decreases, and obtained a great improvement of ferroelectric and piezoelectric performances. B-site-doped BFM-BT ceramics significantly inhibited the formation of impurities, leading to better ferroelectric and piezoelectric performances. The BFM-BT ceramics exhibited high Curie temperature of 519-530celcius and good temperature stability for piezoelectric performances. Thed(33)values of BF, BS, and BA ceramics remained the room temperature value ranging from room temperature to 470celcius. Meanwhile the content of impure phases, oxygen vacancies and valence of Fe(3+)to Fe(2+)decreased with the decreasing radii of B-site doping ions.