Abstract
The ternary ceramics of Pb(Yb1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 (PYMNT) solid solution system is prepared by a two-step synthetic process. Its structure and electrical properties are studied. All the obtained ceramics have pure perovskite structure. It is noted that the morphotropic phase boundary (MPB) of the PYMNT ternary system is not a linear region which is between the MPB compositions of PMNT and PYNT binary systems. The Curie temperature TC of the ternary system varies in the range 165–370 °C and the piezoelectric coefficient d33 varies in the range 335–505 pC N−1. With increasing PYNT content, the dielectric constants ε′ decrease and the coercive field Ec increases. Therefore, the electric properties and TC can be adjusted by selection of composition. The results show that the PYMNT ceramic exhibits higher Curie temperature, larger coercive field and good piezoelectric properties, making it a promising material for high-power electromechanical transducers that can operate in a large temperature range.
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