4.6 Article

Effect of configuration entropy on dielectric relaxor, ferroelectric properties of high-entropy (NaBiBa)x(SrCa)(1-3x)/2TiO3 ceramics

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DOI: 10.1007/s10854-022-07731-x

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  1. National Natural Science Foundation of China [52172118, 51872175]
  2. International Cooperation Projects of Shaanxi Province [2021KW-22]

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The unique structure and performance of high-entropy ceramics provide a new perspective for modern material research. High-entropy (NaBiBa)(x)(SrCa)((1-3x)/2)TiO3 (x = 0.18 to 0.22) ceramics with a cubic-like perovskite structure were successfully fabricated, and the configuration entropy was adjusted. The ceramics exhibited superior relaxor behavior and polarization properties, indicating their excellent potential in relaxor ferroelectric exploitation.
The unique structure and performance of high-entropy ceramics raised a novel perspective for modern material research. The high-entropy (NaBiBa)(x)(SrCa)((1-3x)/2)TiO3 (x = 0.18 similar to 0.22) ceramics were successfully fabricated by a conventional solid state reaction method and the configuration entropy was adjusted. X-ray diffraction analysis showed that all ceramics exhibit a cubic-like perovskite structure. Moreover, the grain size of the ceramics from 1 mu m to 4 mu m with x decreasing, and the relative density of the ceramics all above 90%. All dispersion coefficient values were greater than 1.72, indicating the superior relaxor behavior. High maximum polarization of P-m similar to 16.59 mu C/cm(2) and low residual polarization of P-r similar to 1.44 mu C/cm(2) at x = 0.21 under applied field of 100 kV/cm. The study demonstrated the excellent potential of configuration entropy on relaxor ferroelectric exploitation.

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