High entropy oxide (HEO) (Ce_0.2La_0.2Pr_0.2Sm_0.2Y_0.2)O_1.6-δ with a phase pure fluorite was synthesized using low-temperature solution combustion. A low-temperature formation of HEO was evidenced at 500 ºC. The HEO formation at 500 ºC was due to the exothermicity of the combustion redox reaction, where the internal temperature might have reached a much higher temperature for a limited amount of time. The presence of Sm₂O₃ and Y₂O₃ was visible upto 500 ºC, while La₂O₃ was detected up to 900 ºC and the HEO fully got stabilized at 1000 ºC with a single-phase, fcc fluorite structure with an Fm-3m space group. The HEO displays one of its parent oxide Ce-O structural properties as both belong to the fluorite family and had lattice parameters very close to each other. The presence of a secondary phase in the 2 and 3-cation systems and the display of a single phase in the 4 and 5-cation systems indicated the role of configurational entropy in phase stabilization. Raman of HEO also affirmed the formation of HEO at 500 °C, the complete elimination of secondary phases at 1000 °C, and a fully disordered occupancy of various metal cations with severe lattice distortion. A Flake morphology with a nanogranular cluster on the surface was displayed. Dielectric measurements at room temperature showed permittivity (κ) ≈ 29 – 5.7 from 100 Hz - 1 MHz.

采用低温溶液燃烧法合成了具有纯萤石相的高熵氧化物（HEO）（Ce _0.2 La _0.2 Pr _0.2 Sm _0.2 Y _0.2）O _{1.6-δ 。}在 500 ºC 时证明了 HEO 的低温形成。HEO 在 500 ºC 的形成是由于燃烧氧化还原反应的放热，其中内部温度可能在有限的时间内达到更高的温度。_{Sm 2} O ₃和 Y ₂ O ₃的存在在高达 500 ºC 时可见，而 La ₂ O ₃在高达 900 ºC 的温度下被检测到，HEO 在 1000 ºC 时完全稳定，具有Fm-3m 的单相 fcc 萤石结构空间群。HEO 显示出其母体氧化物 Ce-O 结构特性之一，因为两者都属于萤石族，并且晶格参数彼此非常接近。2 和 3 阳离子系统中第二相的存在以及 4 和 5 阳离子系统中单相的显示表明构型熵在相稳定中的作用。HEO 的拉曼光谱也证实了 500 °C 时 HEO 的形成，1000 °C 时第二相的完全消除，以及各种金属阳离子完全无序占据，晶格畸变严重。显示了在表面上具有纳米颗粒团簇的薄片形态。室温下的介电测量显示介电常数 (κ) ≈ 29 – 5.7，从 100  Hz - 1  MHz。