fig1

Figure 1. (A) Contour map of the distribution of polarization angles (θ). (B) Statistics of the distribution of θ in the range of 0°-45°, extracted from over 30, 000 polarization vectors. (C) Strong correlation between d₃₃ and the number of B-site element types (n_B) for a series of PbBO₃-based solid solutions. Reproduced with permission from^[17], Copyright 2022, Elsevier. (D) Atomic-resolution high-angle annular dark field - scanning transmission electron microscopy (HAADF STEM) polarization vector image along [110]_c. (E) Comparison of the recoverable energy storage density, W_rec (efficiency, η ≥ 90%), of (K,Na)NbO₃ (KNN)-based high-entropy ceramic with other representative lead-free bulk ceramics with W_rec ≥ 1 J cm^-3. Reproduced with permission from^[18], Copyright 2022, Nature Publishing Group.