Microstructure and dielectric properties of perovskite-structured high-entropy ceramics of Pb(Zr0.25Ti0.25Sn0.25Hf0.25)O3

A dielectric high-entropy ceramic with a composition of Pb(Zr0.25Ti0.25Sn0.25Hf0.25)O3 was designed through B-site doping, and then prepared by solid phase reaction method combined with conventional sintering in air for 3 h at 1200 °C, 1250 °C and 1300 °C, respectively. All the high-entropy ceramics of Pb(Zr0.25Ti0.25Sn0.25Hf0.25)O3 possess a perovskite structure with uniform elemental distribution and their average grain size falls within the range of 3.19–5.5 μm. For the sample sintered at 1250 °C, the dielectric loss is less than 0.07 in the testing frequency of 1 kHz∼1 MHz in 30–350 °C, and the dielectric constant reaches a peak of 14356 at about 270 °C at 1 kHz. At room temperature, the remnant polarization Pr reaches 28.8 μC/cm2. The results demonstrate that the high-entropy ceramic of Pb(Zr0.25Ti0.25Sn0.25Hf0.25)O3 has great potentials in the dielectric and ferroelectric field.