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2002 Fiscal Year Final Research Report Summary

Synthesis of thermoelectric materials by simultaneous addition of several kinds of fine particles and improvement of their thermoelectric properties

Research Project

Project/Area Number 12305049
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Material processing/treatments
Research InstitutionOsaka University

Principal Investigator

ITO Mikio  Osaka University, Graduate School of Engineering, Assistant Professor, 大学院・工学研究科, 助手 (00294033)

Co-Investigator(Kenkyū-buntansha) KATSUYAMA Shigeru  Osaka University, Graduate School of Engineering, Associate Professor, 大学院・工学研究科, 助教授 (00224478)
Project Period (FY) 2000 – 2002
KeywordsThermoelectric material / Thermal conductivity / Mechanical alloying / Polymerized complex method / Fine particle / Figure of merit / Seebeck coefficient / Electrical resistivity
Research Abstract

Several kinds of fine particles, such as insulating conductive and/or metallic conductive fine particles, were dispersed in the matrix of thermoelectric materials. The thermoelectric materials used in this study were β-FeSi_2, CoSb_3 and several thermoelectric oxides, and the effects of these fine particles addition of the thermoelectric performance, especially the thermal conductivity. In the case of the β-FeSi_2, it was found that a densely sintered body with the high figure of merit could be synthesized by SiC fine particle dispersion and Cu powder addition. The addition of rare earth oxides, which have low thermal conductivity and good chemical stability, was significantly effective on reducing thermal conductivity and increasing Seebeck coefficient, especially when Y_2O_3 powder was added. The improvement of Seebeck coefficient and the results of the Hall coefficient measurement suggest that the solution of a small amount of the rare earth element into the Fe site of the β-FeSi_2 matrix occurs. In the case of the CoSb_3, the dispersion of the metallic FeSb_2 and NiSb fine particles was quite effective on reducing the electrical resistivity, as well as the thermal conductivity, resulting in the significant improvement of the thermoelectric performance. The thermoelectric oxides, ZnO and Na_xCo_2O_4 were synthesized by the polymerized complex method (PCM). The PCM was found to promote the solution of doping element compared to the conventional solid state reaction method, expanding the possibility of enhancement of thermoelectric properties by doping. When the impurity phases precipitated, they were finely dispersed in the matrix, indicating that the PCM is also effective on reducing the thermal conductivity.

  • Research Products

    (34 results)

All Other

All Publications (34 results)

  • [Publications] M.Ito, H.Nagai, S.Katsuyama, K.Majima: "Preparation of β-FeSi_2 by Liquid Phase Sintering and Its Thermoelectric Properties"Journal of Advanced Science. Vol.12, No.4. 385-391 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, H.Nagai, S.Katsuyama, K.Majima: "Effects of Ti, Nb and Zr doping on Thermoelectric Performance of β-FeSi_2"Journal of Alloys and Compounds. Vol.315. 251-258 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, H.Nagai, T.Tanaka, S.Katsuyama, K.Majima: "Thermoelectric Performance of n-Type and p-Type β-FeSi_2 Prepared by Pressureless Sintering with Cu Addition"Journal of Alloys and Compounds. Vol.319. 303-311 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Katsuyama, S.Tokuno, M.Ito, K.Majima, H.Nagai: "Phase Relation and Thermoelectric Properties of the Ternary Lanthanum Chalcogenide System La-A-S (A=Ca, Ba)"Journal of Alloys and Compounds. Vol.320. 126-132 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, H.Nagai, D.Harimoto, S.Katsuyama, K.Majima: "Effects of Cu Addition on the Thermoelectric Properties of Hot-Pressed β-FeSi_2 with SiC Dispersion"Journal of Alloys and Compounds. Vol.322. 226-232 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, H.Nagai, T.Katsura, S.Katsuyama, K.Majima: "Preparation of SiC Dispersed Fe_<0.98>Co_<0.02>Si_2 by Pressureless Sintering with Cu and Si Addition and Its Thermoelectric Performance"Materials Transactions. Vol.42, No.7. 1451-1457 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, H.Nagai, E.Oda, S.Katsuyama, K.Majima: "Effects of P Doping on the Thermoelectric Properties of β-FeSi_2"Journal of Applied Physics. Vol.91, No.4. 2138-2142 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, T.Nagira, Y.Oda, S.Katsuyama, K.Majima, H.Nagai: "Effect of Partial Substitution of 3d Transition Metals for Co on the Thermoelectric Properties of Na_xCo_2O_4"Materials Transactions. Vol.43, No.3. 601-607 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, T.Nagira, Y.Tsuchiya, S.Katsuyama, K.Majima, H.Nagai: "Microstructure and Thermoelectric Properties of Na_xCo_2O_4 Synthesized by Spark Plasma Sintering"Journal of the Japan Society of Powder and Powder Metallurgy. Vol.49, No.5. 406-411 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, H.Nagai, E.Oda, S.Katsuyama, K.Majima: "Thermoelectric Properties of β-FeSi_2 with B_4C and BN Dispersion by Mechanical Alloying"Journal of Materials Science. Vol.37, No.13. 2609-2614 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Katsuyama, Y.Takagi, M.Ito, K.Majima, H.Nagai, H.Sakai, K.Yoshimura, K.Kosuge: "Thermoelectric Properties of(Zn_<1-y>Mg_y)_<1-x>Al_xO Ceramics Prepared by The Polymerized Complex Method"Journal of Applied Physics. Vol.92, No.3. 1391-1398 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, H.Nagai, T.Tahata, S.Katsuyama, K.Majima: "Effects of Zr Substitution on Phase Transformation and Thermoelectric Properties of β-FeSi_2"Journal of Applied Physics. Vol.92, No.6. 3217-3222 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Nagira, M.Ito, S.Katsuyama, K.Majima, H.Nagai: "Thermoelectric Properties of (Na_<1-y>M_y)_xCo_2O_4 (M=K,Sr,Y,Nd,Sm and Yb ; y=0.01〜0.35)"Journal of Alloys and Compounds. Vol.348. 263-269 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Nagira, M.Ito, S.Katsuyama: "Thermoelectric Properties of Na_xCo_2O_4 Prepared by the Polymerized Complex Method and Hot-Pressing"Materials Transactions. Vol.44, No.1. 155-160 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, T.Nagira, D.Furumoto, S.Katsuyama, K.Majima, H.Nagai: "Synthesis of Na_xCo_2O_4 Thermoelectric Oxides by Polymerized Complex Method"Scripta Materialia. Vol.48, No.4. 403-408 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, T.Tada, S.Katsuyama: "Thermoelectric Properties of Fe_<0.98>Co_<0.02>Si_2 with ZrO_2 and Rare-earth Oxide Dispersion by Mechanical Alloying"Journal of Alloys and Compounds. Vol.350. 296-302 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Katsuyama, M.Watanabe, M.Kuroki, T.Maehata, M.Ito: "Effect of NiSb on The Thermoelectric Properties of Skutterudite CoSb_3"Journal of Applied Physics. Vol.93, No.5. 2758-2764 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Ito, H.Nagai, S.Katsuyama, K.Majima: "Preparation of β-FeSi_2 by Liquid Phase Sintering and Its Thermoelectric Properties"Journal of Advanced Science. Vol. 12, No.4. 385-391 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, H.Nagai, S.Katsuyama, K.Majima: "Effects of Ti, Nb and Zr doping on Thermoelectric Performance of β-FeSi_2"Journal of Alloys and Compounds. Vol.315. 251-258 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, H.Nagai, T.Tanaka, S.Katsuyama, K.Majima: "Thermoelectric Performance of n-Type and p-Type β-FeSi_2 Prepared by Pressureless Sintering with Cu Addition"Journal of Alloys and Comopunds. Vol.319. 303-311 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Katsuvama, S.Tokuno, M.Ito, K.Maiima, H.Nagai: "Phase Relation and Thermoelectric Properties of the Ternary Lanthanum Chalcogenide System La-A-S (A=Ca, Ba)"Journal of Alloys and Compounds. Vol.320. 126-132 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, H.Nagai, D.Harimoto, S.Katsuyama, K.Majima: "Effects of Cu Addition on the Thermoelectric Properties of Hot-Pressed β-FeSi_2 with SiC Dispersion"Journal of Alloys and Compounds. Vol.322. 226-232 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, H.Nagai, T.Katsura, S.Katsuyama, K.Maiima: "Preparation of SiC Dispersed Fe_<0.98>Co_<0.02>Si_2 by Pressureless Sintering with Cu and Si Addition and Its Thermoelectric Performance"Materials Transactions. Vol.42, No.7. 1451-1457 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, H.Nagai, E.Oda, S.Katsuyama, K.Majima: "Effects of P Doping on the Thermoelectric Properties of β-FeSi_2"Journal of Applied Physics. Vol.91, No.4. 2138-2142 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, T.Nagira, Y.Oda, S.Katsuyama, K.Majima, H.Nagai: "Effect of Partial Substitution of 3d Transition Metals for Co on the Thermoelectric Properties of NaCo_2O_4"Materials Transactions. Vol.43, No.3. 601-607 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, T.Nagira, Y.Tsuchiya, S.Katsuyama, K.Majima, H.Nagai: "Microstructure and Thermoelectric Properties of Na_xCo_2O_4 Synthesized by Spark Plasma Sintering"Journal of the Japan Society of Powder and Powder Metallurgy. Vol.49. No.5. 406-411 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, H.Nagai, E.Oda, S.Katsuyama, K.Majima: "Thermoelectric Properties of β-FeSi_2 with B_4C and BN Dispersion by Mechanical Alloying"Journal of Materials Science. Vol.37, No.13. 2609-2614 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Katsuyama, Y.Takagi, M.Ito, K.Majima, H.Nagai, H.Sakai, K.Yoshimura, K.Kosuge: "Thermoelectric Properties of (Zn_<1-y>Mg_y)_<1-x>Al_xO Ceramics Prepared by The Polymerized Complex Method"Journal of Applied Physics. Vol.92, No.3. 1391-1398 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, H.Nagai, T.Tahata, S.Katsuyama, K.Majima: "Effects of Zr Substitution on Phase Transformation and Thermoelectric Prooerties of β-FeSi_2"Journal of Applied Physics. Vol.92, No.6. 3217-3222 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Nagira, M.Ito, S.Katsuyama, K.Maiima, H.Nagai: "Thermoelectric Properties of (Na_<1-y>M_y)_xCo_2O_4 (M=K, Sr, Y, Nd, Sm and Yb; y=0.01〜0.35)"Journal of Alloys and Compounds. Vol.348. 263-269 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Nagira, M.Ito, S.Katsuyama: "Thermoelectric Properties of Na_xCo_2O_4 Prepared by the Polymerized Complex Method and Hot-Pressing"Materials Transactions. Vol.44, No. 1. 155-160 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, T.Nagira, D.Furumoto, S.Katsuyama, K.Majima, H.Nagai: "Synthesis of Na_xCo_2O_4 Thermoelectric Oxides by Polymerized Complex Method"Scripta Materialia. Vol.48, No.4. 403-408 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Ito, T.Tada, S.Katsuyama: "Thermoelectric Properties of Fe_<0.98>Co_<0.02>Si_2 with ZrO_2 and Rare-earth Oxide Dispersion by Mechanical Alloying"Journal of Alloys and Compounds. Vol.350. 296-302 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Katsuyama, M.Watanabe, M.Kuroki, T.Maehata, M.Ito: "Effect of NiSb on The Thermoelectric Properties of Skutterudite CoSb_3"Journal of Applied Physics. Vol.93, No.5. 2758-2764 (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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