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Engineering electrical transport in α-MgAgSb to realize high performances near room temperature

Journal Article


Abstract


  • α-MgAgSb shows promise as a potential new low-temperature thermoelectric (TE) material and has been widely researched recently. We explored the effects of sintering conditions on the properties of MgAgSb-based thermoelectric materials through manipulating a spark plasma sintering system (SPS), where Ag vacancies and Mg point defects play a dominant role. The transport properties of MgAgSb were optimized effectively and efficiently, especially for electrical transport. As a result, we obtained a steady power factor (PF) of ∼17 μW cm-1K-2, owing to the optimal carrier concentration of 9.8 × 1019cm-3. Additionally, α-MgAgSb exhibits an ultralow lattice thermal conductivity of around 0.45 Wm-1K-1at 375 K. More importantly, a high ZT value of 0.85 was achieved below 375 K, approaching room temperature.

UOW Authors


  •   Lei, Jingdan (external author)
  •   Zhang, De (external author)
  •   Guan, Weibao (external author)
  •   Cheng, Zhenxiang
  •   Wang, Chao (external author)
  •   Wang, Yuanxu (external author)

Publication Date


  • 2018

Citation


  • Lei, J., Zhang, D., Guan, W., Cheng, Z., Wang, C. & Wang, Y. (2018). Engineering electrical transport in α-MgAgSb to realize high performances near room temperature. Physical Chemistry Chemical Physics, 20 (24), 16729-16735.

Scopus Eid


  • 2-s2.0-85049013408

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3175

Number Of Pages


  • 6

Start Page


  • 16729

End Page


  • 16735

Volume


  • 20

Issue


  • 24

Place Of Publication


  • United Kingdom

Abstract


  • α-MgAgSb shows promise as a potential new low-temperature thermoelectric (TE) material and has been widely researched recently. We explored the effects of sintering conditions on the properties of MgAgSb-based thermoelectric materials through manipulating a spark plasma sintering system (SPS), where Ag vacancies and Mg point defects play a dominant role. The transport properties of MgAgSb were optimized effectively and efficiently, especially for electrical transport. As a result, we obtained a steady power factor (PF) of ∼17 μW cm-1K-2, owing to the optimal carrier concentration of 9.8 × 1019cm-3. Additionally, α-MgAgSb exhibits an ultralow lattice thermal conductivity of around 0.45 Wm-1K-1at 375 K. More importantly, a high ZT value of 0.85 was achieved below 375 K, approaching room temperature.

UOW Authors


  •   Lei, Jingdan (external author)
  •   Zhang, De (external author)
  •   Guan, Weibao (external author)
  •   Cheng, Zhenxiang
  •   Wang, Chao (external author)
  •   Wang, Yuanxu (external author)

Publication Date


  • 2018

Citation


  • Lei, J., Zhang, D., Guan, W., Cheng, Z., Wang, C. & Wang, Y. (2018). Engineering electrical transport in α-MgAgSb to realize high performances near room temperature. Physical Chemistry Chemical Physics, 20 (24), 16729-16735.

Scopus Eid


  • 2-s2.0-85049013408

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3175

Number Of Pages


  • 6

Start Page


  • 16729

End Page


  • 16735

Volume


  • 20

Issue


  • 24

Place Of Publication


  • United Kingdom