Archives of Metallurgy and Materials

Institute of Metallurgy and Materials Science of Polish Academy of Sciences
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INFLUENCE OF SPARK PLASMA SINTERING TEMPERATURE ON MICROSTRUCTURE AND TTHERMOELECTRIC PROPERTIES OF Cu-DOPED Bi0.5Sb1.495Te3 COMPOUND

  • CHUL-HEE LEE (KONGJU NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING) ;
  • PEYALA DHARMAIAH (KONGJU NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING) ;
  • JUN-WOO SONG (KONGJU NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING) ;
  • KWANG-YONG JEONG (KONGJU NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING) ;
  • SOON-JIK HONG (KONGJU NATIONAL UNIVERSITY, DIVISION OF ADVANCED MATERIALS ENGINEERING)
  • Published : 20200000
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Abstract

Due to air pollution, global warming and energy shortage demands new clean energy conversion technologies. The conversion of industrial waste heat into useful electricity using thermoelectric (TE) technology is a promising method in recent decades. Still, its applications are limited by the low efficiency of TE materials in the operating range between 400-600 K. In this work, we have fabricated Cu0.005Bi0.5Sb1.495Te3 powder using a single step gas atomization process followed by spark plasma sintering at different temperatures (623, 673, 723, and 773 K), and their thermoelectric properties were investigated. The variation of sintering temperature showed a significant impact on the grain size. The Seebeck coefficient values at room temperature increased significantly from 127 µVK to 151 µV/K with increasing sintering temperature from 623 K to 723 K due to decreased carrier concentration. The maximum Z T values for the four samples were similar in the range between 1.15 to 1.18 at 450 K, which suggest these materials could be used for power generation in the mid-temperature range (400-600 K).

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Acknowledgement

This work was supported by the Basic Research Laboratory Program through the Ministry of Education of the Republic of Korea (2019R1A4A1026125). This work was supported by the National Research Council ofScience & Technology (NST) grant by the Korea government (MSIP) (No. CRC-15-06-KIGAM).