Ultrahigh piezoelectric performances of (K,Na)NbO₃ based ceramics enabled by structural flexibility and grain orientation.

ABSTRACT: (K,Na)NbO₃-based ceramics are deemed among the most promising lead-free piezoelectric materials, though their overall piezoelectric performance still lags behind the mainstream lead-containing counterparts. Here, we achieve an ultrahigh piezoelectric charge coefficient d₃₃ ∼ 807 pC·N^-1, along with a high longitudinal electromechanical coupling factor (k₃₃ ∼ 88%) and Curie temperature (T_c ∼ 245 °C) in the (K,Na)(Nb_1-xSb_x)O₃-Bi_0.5Na_0.5ZrO₃-BiFeO₃ (KNN-xSb) system through structural flexibility and grain orientation strategies. Phenomenological models, phase field simulations and high-angle annular dark-field scanning transmission electron microscopy reveal that

SUBMITTER: Zhu LF 

PROVIDER: S-EPMC11751466 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature