Thermoelectric properties of Mn-doped Mg-Sb single crystals

Soohyun Kim, Chungman Kim, Yang Ki Hong, Takahiro Onimaru, Koichiro Suekuni, Toshiro Takabatake, Myung Hwa Jung

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Abstract

We have grown Mg3-xMnxSb2 (x = 0, 0.3, and 0.4) single crystals by the vertical Bridgman method to investigate the effects of Mn substitution on thermoelectric properties of Mg3Sb 2. The grown crystals were single phased and c-axis oriented with the trigonal crystal structure of inverse α-La2O3 type. The Seebeck coefficient (S), electrical resistivity (ρ), and thermal conductivity (κ) were measured at various temperatures ranging from 4 to 500 K. The electrical resistivity at 500 K decreased from 2.30 Ω cm of Mg3Sb2 (x = 0) to 0.20 Ω cm for x = 0.3 and to 0.16 Ω cm for x = 0.4, but the thermal conductivity was 1.04 W mK-1 for both x = 0 and 0.4. The Seebeck coefficient became negative when Mn was substituted for Mg, but the absolute value remained almost the same as that for x = 0 in the temperature range between 5 and 600 K. The power factor for x = 0.4 has a large maximum of 370 μW mK-2 at 130 K. As a result, the thermoelectric figure of merit for Mn-substituted Mg3Sb2 is more than one order of magnitude higher than that for pure Mg 3Sb2 (x = 0). This journal is

Original languageEnglish
Pages (from-to)12311-12316
Number of pages6
JournalJournal of Materials Chemistry A
Volume2
Issue number31
DOIs
Publication statusPublished - Aug 21 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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  • Cite this

    Kim, S., Kim, C., Hong, Y. K., Onimaru, T., Suekuni, K., Takabatake, T., & Jung, M. H. (2014). Thermoelectric properties of Mn-doped Mg-Sb single crystals. Journal of Materials Chemistry A, 2(31), 12311-12316. https://doi.org/10.1039/c4ta02386b