Influence of Zn ²⁺ doping on the morphotropic phase boundary in lead‐free piezoelectric (1 – <i>x</i> )Na _1/2 Bi _1/2 TiO ₃ ‐ <i>x</i> BaTiO ₃

Abstract A series of morphotropic phase boundary (MPB) compositions (1– x )Na 1/2 Bi TiO 3 ‐xBaTiO ( = 0.05, 0.055, 0.06, 0.065, 0.07), with and without 0.5 mol% Zn‐doping was synthesized using the solid‐state route. The samples were characterized X‐ray diffraction, dielectric analysis, electromechanical measurements (piezoelectric d 33 coefficient, coupling factor k p , mechanical quality Q m internal bias field E ). increase in ferroelectric‐relaxor transition temperature upon accompanied by a shift MPB toward Na ‐rich side diagram. Higher tetragonal fraction increased distortion noted for Zn‐doped (1 – ‐ BaTiO . In addition, ferroelectric hardening presence an ) observed all doped compositions. piezoelectric constant coefficient decreased up to ∼30%, while 4‐ 6‐fold Apart from establishing structure–property correlation, these results highlight chemically induced diagram doping, which is crucial material selection optimal performance commercialization.