Phase Transformation and Tunable Piezoelectric Properties of Lead‐Free (Na _0.52 K _{0.48− <i>x</i>} Li _<i>x</i> )(Nb _{1− <i>x</i> − <i>y</i>} Sb _<i>y</i> Ta _<i>x</i> )O ₃ System

Abstract

Lead‐free (Na 0.52 K 0.48− x )(Nb 1− x − y Sb y )O 3 ‐ x LiTaO 3 (NKNS–LT) piezoelectric ceramics have been fabricated by ordinary sintering. A special attention was paid to the composition design through which the dielectric and piezoelectric properties of the (Li, Ta, Sb) modified NKN systems were significantly promoted. A property spectrum was generated with a particular discussion on the relationship between the Sb content, the LT content, the polymorphic phase transition, and the electrical properties and their temperature stability. Excellent and tunable electrical properties of d 33 =242–400 pC/N, k p =36%–54%, , and T c =230°–430°C demonstrate a tremendous potential of the compositions studied for device applications.