Investigation on the Microstructure and Electrical Properties of the Compositionally Modified PZT Ceramics Prepared by Mixed-Oxide Method

Malika Abba, Ahmed Boutarfaia, Zelikha Necira, Noura Abdessalem, Hayet Menasra, Abdelhek Meklid

Laboratory of Applied Chemistry, Department of Science Matter, University of Biskra, Biskra, Algeria.

DOI: 10.4236/msa.2013.411091                

Abstract

The structural and electrical properties of Pb[Zr_xTi_0.95-x(Mo_1/3In_2/3)_0.05]O₃ piezoelectric ceramics system with the composition near the morphotropic phase boundary were investigated as a function of the Zr/Ti ratio. Studies were performed on the samples prepared by the conventional method of thermal synthesis of mixed oxides. The materials structure was investigated by X-ray diffractometry to demonstrate the co-existence of the tetragonal and rhombohedral phases. In the present system, the MPB, in which the tetragonal and rhombohedral phases coexist, is in a composition range of 0.47 ≤ x ≤ 0.50. The lattice constants of the a and c axes for the samples were calculated from the XRD patterns. Microstructure of the sintered ceramics was observed by scanning electron microscopy (SEM) of free surfaces specimens. The relative permittivity, dielectric dissipation, piezoelectric coefficient and electromechanical coupling factor reach at maximum value x = 0.49 (ε_r = 7300.345 (at the Curie temperature), tanδ = 0.002050, d₃₁ = 94.965 PC/N and k_p = 0.513 and a Curie temperature of 430°C). These properties are very promising for applications in ultrasonic motors.

Keywords

Morphotropic Phase Boundary; Sintering Temperature; Zr/Ti Ratio

Conflicts of Interest

The authors declare no conflicts of interest.

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