Abstract
Ternary 33Pb(Yb 1/2Nb 1/2)O–(67− x)PbZrO 3– xPbTiO 3 [PYNZ–PT x] were investigated as a function of the PT contents. The maximum value of piezoelectric coefficient ( d 33) was obtained, being on the order of 540 pm/V with high Curie temperature ( Tc) of 375 °C for PYNZ–PT48 composition being regarded as the morphotropic phase boundary (MPB). To further increase its properties, La 2O 3 with 0.0 mol% ≤ x ≤ 3.0 mol% was substituted for PbO as an A-site in ternary PYNZ–PT48 [PYNZT]. The substitution of La 3+ for Pb 2+ in PYNZT was found to increase the tetragonality, but greatly reduced Tc and broadened the dielectric permittivity maximum. The relative permittivity was found to follow a Curie–Weiss Law above the deviation temperature ( T D ). The optimized properties with d 33 of 600 pm/V, maximum dielectric permittivity ( ɛ max ) of 22500 (at the Tc = 315 °C and 1 kHz) were obtained in PYNZT-La2.0.
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