PMN-PT based quaternary piezoceramics with enhanced piezoelectricity and temperature stability

摘要: The phase structure, piezoelectric, dielectric, and ferroelectric properties of (0.80 − x)PMN-0.10PFN-0.10PZ-xPT were investigated systematically. morphotropic boundary (MPB) was confirmed to be 0.30 < x < 0.34. Both MPB compositions x = 0.32 x = 0.33 exhibit high piezoelectric coefficients d33 = 640 pC/N 580 pC/N, electromechanical couplings kp 0.53 0.52, respectively. Of particular importance is that the composition with found process field-induced strain coefficient d33* 680 pm/V, exhibiting a minimal temperature-dependent behavior, being less than 8% in temperature range 25–165 °C, which can further by d31, variation 9%. temperature-insensitive values explained counterbalance ascending dielectric permittivity descending polarization increasing temperature. These features make PMN-PT based quaternary promising for actuator applications dem...