x Zr x O3 (BCT–BZT) were prepared via sintering BCT and BZT nanoparticles, which were synthesized using a modified Pechini polymeric precursor method, at a low temperature of 1260°C. The relative densities of the ceramics prepared with different zirconium contents (x) were all above 95.3%, reaching a maximum of 97% when x?=?0.08. X-ray diffraction results confirmed the onset of phase transformation from orthorhombic to rhombohedral symmetry with increasing zirconium contents, and the polymorphic phase transition was observed at x?=?0.10. The dielectric dispersion, diffuse phase transition (DPT), and relaxor-like ferroelectric characteristics as a function of zirconium content were thoroughly studied. Optimum physical properties, remnant polarization (P r)?=?16.4?μC/cm2, piezoelectric constant (d 33)?=?~240?pC/N, and electromechanical coupling factor (k p)?=?0.22, were obtained at x?=?0.10. The findings of the current DPT behavior study of BCT–BZT ceramics are believed to be insightful to the development of ferroelectric materials." />