Dielectric and piezoelectric properties of (K0.5 Na0.5) Nb O3 -Ba (Zr0.05 Ti0.95) O3 lead-free ceramics

Abstract

Lead-free ceramics (1-x) (K0.5 Na0.5) Nb O3 -xBa (Zr0.05 Ti0.95) O3 doped with 1 mol % Mn O2 have been fabricated by pressureless sintering. With the Mn O2 doping, all the ceramics can be well sintered at 1100-1160 °C and exhibit a dense and pure perovskite structure. After the addition of Ba (Zr0.05 Ti0.95) O3, a relax behavior is induced and both the cubic-tetragonal and tetragonal-orthorhombic phase transitions shift to lower temperatures. Coexistence of the orthorhombic and tetragonal phases is hence formed in the ceramics with 0.04