Abstract
Lattice structure, phase evolution, and thermal conductivities were studied for multicomponent complex high entropy oxides (HEOs) synthesized using quaternary mixture containing different binary oxides (ZrO2, HfO2, TiO2, and SnO2). The lattice structure of four-component (Zr0.25Hf0.25Ti0.25Sn0.25)O2 ceramics varying from those of several types of starting powders to single lattice structure exhibited orthorhombic phase. The resultant thermal conductivities of (Zr0.25Hf0.25Ti0.25Sn0.25)O2 ceramics exhibited increasing and decreasing trend below and above 900 °C, respectively. This phenomenon is mainly attributed to the reversible transformation characteristics of HEO, which lead to the changes in lattice distortion, resulting in increase and decrease in thermal conductivity, respectively.
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