High entropy pyrochlore (La0.3Gd0.3Ca0.4)2(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)2O7 ceramic with amorphous-like thermal conductivity for environmental/thermal barrier coating applications

doi:10.1016/j.jmst.2024.02.089

Abstract

Abstract: Low thermal conductivity and excellent mechanical strength are essential to pyrochlore A₂B₂O₇ ceramic for environmental/thermal barrier coating applications. To collaboratively tailor the mechanical and thermal properties of A₂B₂O₇ ceramic, a novel high entropy pyrochlore ceramic (La_0.3Gd_0.3Ca_0.4)₂(Ti_0.2Zr_0.2Hf_0.2Nb_0.2Ta_0.2)₂O₇ with significant atomic radius and mass fluctuation is proposed by simultaneously introducing various elements with different valence states at A and B cation sites. The as-synthesized (La_0.3Gd_0.3Ca_0.4)₂(Ti_0.2Zr_0.2Hf_0.2Nb_0.2Ta_0.2)₂O₇ exhibits enhanced fracture toughness (1.68 MPa m^1/2), amorphous-like low thermal conductivity (1.45 W m^-1 K^-1 at 900 °C) and matched thermal expansion coefficient (9.0 × 10^-6 K^-1 at 1200 °C) with Al₂O₃/Al₂O₃ CMCs. The extensive misfits in atomic weight, ionic radius among the substitutional cations in combination with the intrinsic oxygen vacancies in the anion sublattice play significant roles in the thermal conductivity reduction of (La_0.3Gd_0.3Ca_0.4)₂(Ti_0.2Zr_0.2Hf_0.2Nb_0.2Ta_0.2)₂O₇ ceramic. The combination of outstanding mechanical and thermal properties indicates that this type of material has a good application prospect for environmental/thermal barrier coatings.

Key words: High entropy ceramic, Pyrochlore structure, Mechanical properties, Thermal conductivity, Phonon scattering

Zifan Zhao, Ziyang Ruan, Rong Li, Shixiao Yan, Xiaoliang Sun, Chi Liu, Di Zhang, Bin Xu, Zhiyi Ren, Meng Wang, Jianyu Li, Jiang Tian, Yehua Jiang, Jing Feng, Yanchun Zhou. High entropy pyrochlore (La_0.3Gd_0.3Ca_0.4)₂(Ti_0.2Zr_0.2Hf_0.2Nb_0.2Ta_0.2)₂O₇ ceramic with amorphous-like thermal conductivity for environmental/thermal barrier coating applications[J]. J. Mater. Sci. Technol., 2025, 205: 315-326.

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High entropy pyrochlore (La_0.3Gd_0.3Ca_0.4)₂(Ti_0.2Zr_0.2Hf_0.2Nb_0.2Ta_0.2)₂O₇ ceramic with amorphous-like thermal conductivity for environmental/thermal barrier coating applications

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