High-entropy Sm2B2O7 (B=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) oxides with highly disordered B-site cations for ultralow thermal conductivity

Materials with ultralow thermal conductivity and good thermal stability are of great interest in numerous applications such as energy storage and conversion devices, and thermal insulation components. In this work, a family of high-entropy Sm2B2O7 (Bi=Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) oxides with highly disordered cations on the B-site has been synthesized by introducing large atomic-size mismatch, mass and charge disorder. Through tuning the composition, the high-entropy Sm2B2O7 oxides can be engineered from pyrochlore to fluorite structure, accompanied with an order-disorder transition. The pyrochlore Sm-2 (Nb0.2Sn0.2Ti0.2Y0.2Zr0.2)(2)O-7 and fluorite Sm-2(Nb0.2Ta0.2Y0.2Yb0.2Zr0.2)(2)O-7 exhibit low thermal conductivities of 1.35 W.m(-1).K-1 and 1.23 W.m(-1).K-1, respectively, indicating their good thermal insulation. In addition, the high-entropy fluorite Sm-2(Nb0.2Ta0.2Y0.2Yb0.2Zr0.2)(2)O-7 also shows average thermal expansion coefficient of 10.2 x 10(-6)degrees C-1 and high-temperature stability even after thermal exposure at 1600 degrees C in air for 30 h. These results indicate that the high-entropy Sm2B2O7 (B-Ti, Zr, Sn, Hf, Y, Yb, Nb, and Ta) can be promising candidates for thermal barrier coatings and thermally insulators. (C) 2022 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Automated summary

A family of high-entropy Sm2B2O7 oxides with highly disordered cations on the B-site, synthesized by introducing atomic-size mismatch, mass and charge disorder, were investigated. By tuning the composition, the oxides transformed from pyrochlore to fluorite structure, accompanied with an order-disorder transition. The high-entropy fluorite Sm-2(Nb0.2Ta0.2Y0.2Yb0.2Zr0.2)(2)O-7 showed low thermal conductivity, average thermal expansion coefficient, and high-temperature stability, making it a promising candidate for thermal barrier coatings and thermally insulators.