In this paper, the effects of SrTiO3 are investigated by using the solid-state reaction method for (Na0.48K0.48Li0.04) Nb0.04Ta0.05Sb0.06O3 lead free ceramics (Na0.48-xK0.48-xLi0.04Srx)Nb0.04-xTixTa0.05Sb0.06O3). The structural, dielectric, piezoelectric, and ferroelectric properties are discussed in detail. When the amount of SrTiO3 dopants was increased, the phase transition temperature TO-T and Tc drastically decreased, and the phase coexistence of the orthorhombic and tetragonal phases occurred at x=0.005-0.008, leading to a significant enhancement in the electric properties of the samples. The ceramics with x=0.007 exhibited good electrical properties (d33 = 280 pCN-1, kp = 47%, e = 1666, g33 = 19 (10-3Vm/N), d33 × g33 = 5202 (10-15m2/N), Pr = 15.1 μC/cm2, and Ec = 14.2 kV/cm) compared with the pure NKN-based samples (d33 = 226 pCN-1, kp = 44%, er = 1250, tan d = 3%, g33 = 20 (10-3Vm/N), d33 × g33 = 4615 (10-15m2/N), Pr = 9.25 μC/cm2, and Ec = 9.7 kV/cm). In particular, the tan d loss of the proposed samples is only 2%, which is quite small compared to the reported data.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials