High-entropy (Ca0.2Sr0.2Ba0.2La0.2Pb0.2)TiO3 perovskite ceramics with A-site short-range disorder for thermoelectric applications

Novel high-entropy perovskite-type (Ca0.2Sr0.2Ba0.2La0.2Pb0.2)TiO3 (CSBLP) ceramics with cubic structure of Pm-3m space group were successful prepared by solid-state reaction method. Results of XRD, SEM-EDS, HRTEM confirmed a homogeneous distribution and equimolar arrangement of multicomponent cations on the A-site. The high-entropy CSBLP ceramics showed long-range structural order and short-range chemical disorder with widely dispersed nanoscale grains varying sizes of 4-6 nm in the microstructure. Because of increased configurational entropy, the CSBLP ceramic has an enhanced Seebeck coefficient (vertical bar S vertical bar = 272 mu V/K at 1073 K) and low thermal conductivity (K= 1.75 W/m.K at 1073 K) when annealed at 1300 degrees C. This work demonstrates the possibility of effectively reducing thermal conductivity and improving the performance of thermoelectric oxides through high-entropy composition design. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Automated summary

Novel high-entropy CSBLP perovskite-type ceramics were successfully prepared by solid-state reaction method, showing a homogeneous distribution of multicomponent cations and nanoscale grains in the microstructure. The ceramic exhibited enhanced Seebeck coefficient and low thermal conductivity when annealed at high temperature, demonstrating the potential of high-entropy composition design in improving thermoelectric oxide performance.