Effect of mosaicity on energy storage performance of epitaxial BaZr_0.35Ti_0.65O₃ films

It is well known that the macroscopic behaviors of ferroelectric materials were tightly related to their microstructure features. In this work, the mosaicity of epitaxial BaZr_0.35Ti_0.65O₃ films was studied by analyzing the broadening effect of reciprocal lattice points. The smaller transverse block size (Dx) and relatively large tilt angle of crystal blocks (Δω) were suggested to promote the delay saturation of polarization. Meanwhile, the electric breakdown strength (EB) could be enhanced in the samples with smaller Dx, which can further improve the energy storage density efficiently. Ultimately, an ultrahigh recoverable energy density (Wrec) of 100.8 J/cm³ was achieved in the BaZr_0.35Ti_0.65O₃ films prepared at 700 °C.