Abstract
Pb(Mg 1/3Nb 2/3)O 3–Pb(Mn 1/3Nb 2/3)O 3–Pb(Zr x Ti 1− x )O 3 quaternary piezoelectric ceramics with varying Zr/Ti ratio, which locate in the vicinity of the morphotropic phase boundary (MPB), were prepared. The phase structure, the piezoelectric and dielectric properties of the system were investigated. X-ray diffraction patterns indicate that the MPB of the tetragonal and rhombohedral phase lies in the range 0.49< x<0.52. Both the piezoelectric coefficient ( d 33)/electromechanical coupling factor ( K p) and the dielectric constant ( ε r) reach the maximum values at x=0.50. The changes of resonant frequency with increasing Zr/Ti ratio are from a positive to a negative value and obtained a minimum value at x=0.50, which reflects the transition from tetragonal phase to rhombohedral phase.
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