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The solid solution of xBi(Fe 1/3 Nb 2/3 )O 3 –(1-x)Pb(Zr 0.50 Ti 0.50 )O 3  ceramics near morphotropic phase boundary (MPB) (BFN–PZT, x = 0, 0.0025, 0.005, 0.0075, 0.01) were prepared by conventional solid-state reaction method. The samples added with different Bi 2 O 3 , Fe 2 O 3 , Nb 2 O 5  contents were compared in terms of the phase structure, microstructure, dielectric properties, and piezoelectric properties. In particular, rhombohedral-tetragonal morphotropic phase boundary was observed in BFN–PZT crystal structure near the composition of x = 0.005. The BFN–PZT ceramics exhibited the following optimal properties at x = 0.005: dielectric constant ϵ r  of 847, dielectric loss tanδ of 0.034, Curie temperature T C  of 390°C, electrical conductivity σ of 0.441 (Mohm.m) −1 , piezoelectric charge constant d 33  of 416 pC/N, electromechanical coupling factor K P  of 0.654, and mechanical quality factor Q m  of 426, making it a promising material for use in high-intensity ultrasound applications.

Structural, dielectric and piezoelectric characterization of BFN-modified PZT-based (MPB) ceramics