Dielectric, elastic, and piezoelectric matrices of [001]-textured Mn-PMN-PZT ceramics.

[001]-textured 0.4P(Mg_1/3Nb_2/3)O₃-0.25PbZrO₃-0.35PbTiO₃-0.5%MnO₂ (Mn-PMN-PZT) ceramics were fabricated by templated grain growth using 2 vol. % BaTiO₃ in this paper. Full matrices of dielectric (ɛ_ij), elastic (s_ij, c_ij), and piezoelectric (d_ij) parameters were obtained by the resonance–antiresonance method. The dielectric constant ɛ₃₃^T of textured ceramics reaches 2600, which is four times that of random ceramics. Textured Mn-PMN-PZT ceramics exhibit high d₃₃ = 984 pC/N and high k₃₃ = 0.89, which is much larger than d₃₃ = 223 pC/N and k₃₃ = 0.70 of random ceramics. However, ɛ₁₁^T of ceramics decreases by about 30% after texturing, and the corresponding shear coupling coefficient k₁₅ also decreases from 0.66 to 0.44, which may be due to the reduction in the angle between spontaneous polarization and transverse direction. Furthermore, the temperature stability of the textured ceramics was evaluated as well. The phase transition temperature T_R−T was determined by the impedance method to be 120 °C. The textured Mn-PMN-PZT ceramic shows high temperature stability, which is better than PMN-PT. [ABSTRACT FROM AUTHOR]