High-entropy La(Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)O-3 ceramic exhibiting high emissivity and low thermal conductivity

A novel, high-entropy, perovskite-structured, solid solution La(Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)O-3 ceramic was successfully synthesized via high-temperature solid-state reaction. The crystal structure, microstructure, infrared emissivity, and thermophysical properties were investigated. The experimental results indicated that La(Fe0.2Co0.2Ni0.2Cr0.2Mn0.2)O-3 exhibited an infrared emissivity as high as .92 in the near-infrared region of .76-2.50 mu m. The thermal conductivity was 1.38-1.72 W m(-1) K-1 in the temperature range of 25-1200 degrees C.