Dielectric and piezoelectric properties of KCT added (Li0.02(Na0.56 K0.46)0.98(Nb0.81Ta0.15Sb0.04)O3 ceramics

In this study, [Li-0.02(Na-0.56 K-0.46)(0.98)](Nb0.81Ta0.15Sb0.04)O-3 + x mol% K5.4Cu1.3Ta10O29 ceramics were fabricated by conventional solid-state solution processes. Then, their dielectric and piezoelectric properties were investigated. Sinterability of all samples was enhanced because K5.4Cu1.3Ta10O29 (abbreviated as KCT) acted as sintering aids. As the result of XRD, phase structure showed orthorhombic symmetry when KCT a parts per thousand currency sign 0.2 mol%. Whereas, the phase structure changed from orthorhombic symmetry to tetragonal symmetry when KCT a parts per thousand yenaEuro parts per thousand 0.4 mol%. The results suggest that the orthorhombic and tetragonal phases co-exist in the composition ceramics with 0.2 mol% < KCT < 0.4 mol% at room temperature. The effects of the addition of KCT on the dielectric and piezoelectric properties were investigated. As the result, excellent properties of density=4.81[g/cm(3)], electromechanical coupling factor (k(p))=0.48 and piezoelectric constant(d(33))=252[pC/N] were obtained in the composition ceramics with 0.4 mol%KCT.