Rhombohedral-orthorhombic-tetragonal multiphases coexist in (Ba_(0.85)Ca_(0.15))(Ti_(0.9)Zr_(0.08)Sn_(0.02))O_3-SrTiO_3 piezoelectric ceramics prepared by microwave sintering techniques

摘要

To upgrade integrated piezoelectric properties of lead-free ceramics, (Ba_(0.85) Ca_(0.15))(Ti_(0.9)Zr_(0.08)Sn_(0.02))O_3-SrTiO_3 ceramics were successfully fabricated by the tape casting method and microwave sintering (MWS) techniques. The experimental results show that rhombohedral-orthorhombic-tetragonal(R-O-T) multiphases coexist in the samples, and excellent piezoelectric performance of the ceramics (d_(33) = 398 pC/N, Pr = 3.90 μC/cm~2, Ec = 3.43 kV/cm, tanδ = 4.8%, ε_r= 7791, and Tc = 82 °C, respectively) is obtained under 1300 °C for 1 h. The template of ST, prepared through molten-salt two-step method, can guide the grains to grow in the < 001 > direction.