Thermoelectric Properties of In2O3(ZnO)k (k = 3, 4, 5, 7) Superlattice Ceramics
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In2O3(ZnO)k superlattice ceramics are promising oxide thermoelectric materials, as superlattice interfaces are effective in scattering phonons and filtering low-energy electrons to decrease thermal conductivity and improve the figure of merit (ZT) value. In this work, homologous compounds were prepared by solid-state reaction method using ZnO and In2O3 as raw materials. Phase purity and crystal structure were characterized by x-ray diffraction, revealing that In2O3(ZnO)k crystallizes in an R3 m space group for odd k values and P63/mmc for even k values. The study of thermoelectric (TE) properties showed that as k increased, the thickness of InO(ZnO) 3 + also increased, while the electrical conductivity, thermal conductivity, Seebeck coefficient, power factor and ZT value were all decreased. In2O3(ZnO)3 samples obtained a maximum power factor of 651 μW m−1 K−2 at 973 K, and also achieved a maximum ZT value of 0.24 at 973 K.
KeywordsIn2O3(ZnO)k ceramic thermoelectric properties natural superlattice
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This work was supported by the National Natural Science Foundation of China (Grant No. 51501086) and Yunnan Provincial Applied Basic Research Projects (Grant No. 2017FA023).
The manuscript was written through contributions of all authors. All authors have given approval to the final version of the manuscript. Shuhui Li and Ying Zhou contributed equally to this work.
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