Journal
MATERIALS LETTERS
Volume 299, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2021.130082
Keywords
Ceramics; High entropy oxide; Multicomponent equiatomic orthorhombic oxide; Phase transformation; Thermal conductivity
Funding
- Northwest Institute for Nonferrous Metal Research [YK1904, YK1901]
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The study on multicomponent complex high entropy oxides (HEOs) synthesized using quaternary mixture containing different binary oxides revealed that the lattice structure and thermal conductivities of (Zr0.25Hf0.25Ti0.25Sn0.25)O-2 ceramics varied under different temperatures due to reversible transformation characteristics of HEO, leading to changes in lattice distortion.
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)O-2 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)O-2 ceramics exhibited increasing and decreasing trend below and above 900 degrees 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. (C) 2021 Elsevier B.V. All rights reserved.
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