Thermoelectric Properties of Ca-Mg-Si Alloys

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Abstract

To improve thermoelectric performance of p-type, Ca-Mg-Si alloys were synthesized by mechanical alloying (MA) and/or solid-liquid reaction (SLR). The Ca<SUB>16.7</SUB>Mg<SUB>50.0</SUB>Si<SUB>33.3</SUB> − MA + SLR (synthesized by SLR with milling powder) and the Ca<SUB>16.7</SUB>Mg<SUB>45.5</SUB>Si<SUB>33.3</SUB>Ag<SUB>0.5</SUB> − MA +SLR were composed of the phases of Mg<SUB>2</SUB>Si, CaMgSi and Ca<SUB>7</SUB>Mg<SUB>7.25</SUB>Si<SUB>14</SUB>. Their seebeck coefficient α showed positive, and their power factor <I>P</I> values were 0.02×10<SUP>−3</SUP> W·m<SUP>−1</SUP>·K<SUP>−2</SUP> (670 K) and 0.4×10<SUP>−3</SUP> W·m<SUP>−1</SUP>·K<SUP>−2</SUP> (730 K) respectively. The Ca<SUB>25.0</SUB>Mg<SUB>25.0</SUB>Si<SUB>50.0</SUB> − SLR (synthesized by SLR) was composed of the single Ca<SUB>7</SUB>Mg<SUB>7.25</SUB>Si<SUB>14</SUB> phase, and its α was metallic trend (α\\simeq0) with low electrical resistivity ρ. It is well-known that Mg<SUB>2</SUB>Si is n-type semiconductor. These results indicate that the CaMgSi is p-type. Its α was estimated at 750∼900 μV·K<SUP>−1</SUP> (p-type) at 600 K and its ρ was lower than that of Mg<SUB>2</SUB>Si above 600 K. The <I>P</I> of CaMgSi single phase is expected more than 1.4×10<SUP>−3</SUP> W·m<SUP>−1</SUP>·K<SUP>−2</SUP> (600 K). Thus, CaMgSi is attractive material with high thermoelectric performance of p-type.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 50(7), 1725-1729, 2009-07-01

    The Japan Institute of Metals and Materials

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Codes

  • NII Article ID (NAID)
    10025153970
  • NII NACSIS-CAT ID (NCID)
    AA1151294X
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    13459678
  • NDL Article ID
    10265853
  • NDL Source Classification
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL Call No.
    Z53-J286
  • Data Source
    CJP  NDL  J-STAGE 
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