en گروه سرامیک Ceramic Materials and Engineering Research Paper Research Paper <span style="font-size:11pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span new="" roman="" style="font-family:" times=""><span style="color:black">The structural, dielectric, and ferroelectric properties of (1&minus;x)PFN&ndash;PT/x(Ca,Sr)ZrO₃ ceramics (x = 0&ndash;0.08) were systematically investigated. X-ray diffraction analysis confirmed the formation of a single-phase perovskite structure, while Rietveld refinement revealed a gradual reduction in the monoclinic lattice distortion with increasing CZ and SZ contents, indicating structural evolution toward a pseudocubic-like state near the morphotropic phase boundary (MPB). Quantitative FE-SEM analysis showed dense microstructures with progressive grain refinement at higher modifier concentrations. Temperature-dependent dielectric measurements exhibited the highest dielectric constant for the x = 0.04 compositions, whereas the modified Curie&ndash;Weiss analysis confirmed diffuse phase transition and relaxor behavior, with &gamma; values of 1.94 and 1.68 for PFN&ndash;PT:0.04CZ and PFN&ndash;PT:0.04SZ, respectively. Room-temperature ferroelectric measurements yielded maximum remanent polarization (P_r) values of 24.32 and 34.26 &mu;C cm⁻&sup2; for the CZ- and SZ-modified ceramics at x = 0.04. The enhanced dielectric and ferroelectric properties are closely correlated with the reduced monoclinic distortion near the MPB, highlighting the crucial role of structural optimization in improving the functional performance of PFN&ndash;PT-based ceramics.</span></span></span></span></span><br> &nbsp; ,PFN-PT ceramics,CaZrO₃/SrZrO₃ modification,Morphotropic phase boundary (MPB),Dielectric and ferroelectric properties,Relaxor ferroelectrics. 0 0 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-4108-2&slc_lang=en&sid=1 marjaneh jafari fesharaki m.jafari.fesharaki@pnu.ac.ir 1800319475328460022616 1800319475328460022616 Yes Payame Noor University