Abstract
Polycrystalline samples of (1-x)PMN-xPT [Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 ] (x=0.30 to 0.39) piezoelectric ceramics were synthesized via a solid-state reaction route. Based on the previous literature, 5% mol excess MgO was used in order to eliminate the formation of unwanted pyrochlore phase. Microstructural and compositional analyses have been carried out using scanning electron microscope (SEM) and X-ray diffraction (XRD). Besides, electrical characterization was performed by using impedance analyzer and Berlincourt d33-piezometer. Formation of the pyrochlore phase was eliminated significantly by using excess MgO and one-step calcination method. XRD patterns indicated a transition from rhombohedral to tetragonal phase with increasing PT content. Effect of altering PMN-PT composition on the piezoelectric and dielectric properties was also investigated. The results showed that the rhombohedral and tetragonal phases coexisted at 0.30<x<0.39 and the ceramic with x=0.33 possessed the optimum properties (d 33 =480 pC/N, K T =4555.5, k p =0.505, tanδ=2.9%, Q m =59.6, T c =150 °C).
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