Oxide Reduction Process for the Synthesis of p-Type BixSb2−xTe3 Compounds and Related Thermoelectric Transport Properties
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We propose the oxide reduction process for the fabrication of p-type BixSb2−xTe3 (x = 0, 0.14, 0.24, 0.32, 0.40 and 0.54) compounds. Using starting materials in oxide forms only (Bi2O3, Sb2O3, and TeO2), we could fabricate the compounds with competitive ZT values through the proposed process. The highest ZT of 1.23 was achieved at 373 K in Bi0.32Sb1.68Te3, and the opportunity for tuning the optimum operating temperature of the compounds was also found. The effects of the Bi content on the thermoelectric transport properties were investigated in detail, and it was proven from the viewpoints of structural, electrical, and thermal properties that oxide reduction process could be a general way to fabricate Bi2Te3-based thermoelectric compounds.
KeywordsThermoelectric Bi2Te3 Oxide reduction process Spark plasma sintering
This work was supported by Mid-career Researcher Program (2018R1A2A2A05020902) through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology, Republic of Korea.
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