Low-temperature Fabrication of Polycrystalline .BETA.-FeSi2 Bulk by Reaction of Fe Compact Body with a Na-Si Melt

• Yamada Takahiro

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Kariya Eri

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Morito Haruhiko

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Takahashi Junichi

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• Yamane Hisanori

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

Bibliographic Information

Other Title

• Ｎａ－Ｓｉ融液とＦｅ圧粉成型体の反応によるβ－ＦｅＳｉ２多結晶バルク体の低温合成
• Na Siユウエキ ト Fe アップン セイケイタイ ノ ハンノウ ニ ヨル ベータ FeSi2 タケッショウ バルクタイ ノ テイオン ゴウセイ
• Low-temperature Fabrication of Polycrystalline β-FeSi2 Bulk by Reaction of Fe Compact Body with a Na-Si Melt

Abstract

Polycrystalline bulk β-FeSi₂ samples were prepared by heating a compact body of Fe powder in a Na-Si melt at various conditions, such as density of the Fe compact and the ratio of the source materials. Single-phase bulk β-FeSi₂ samples were prepared by heating Fe compact with density below 3.9 g cm^-3, Si powder with a Si/Fe molar ratio above 2.25, and Na with a Na/Si molar ratio above 0.33 at 800°C for 12 h. Fe powder reacts with Si dissolved in the Na-Si melt and forms ε-FeSi, followed by changing to β-FeSi₂ due to the diffusion of Si while the Na-Si melt soaks into the compact via voids in the compact. Cobalt (Co)-doped β-FeSi₂ bulk samples were prepared by heating compact bodies of powder mixtures of Fe powder with grain size of < 45 μm and Co powder with grain sizes of 1-2 μm or < 150 μm in a Na-Si melt. The Co-doped bulk sample prepared with Co powder of 1-2 μm grain size was homogeneous and showed thermoelectric properties better than those of the sample prepared with Co powder of < 150 μm in grain size. It is considered that Co-doped β-FeSi₂ is formed by mutual diffusion between β-FeSi₂ and Co silicides.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 58 (2), 110-115, 2011

  Japan Society of Powder and Powder Metallurgy

Keywords

• <I>β</I>-FeSi<SUB>2</SUB>
• Na-Si melt
• low temperature preparation
• thermoelectric property

Details

• CRID: 1390282681288786176
• NII Article ID: 10027916252
• NII Book ID: AN00222724
• DOI: 10.2497/jjspm.58.110
• COI: 1:CAS:528:DC%2BC3MXjtFWrtb8%3D
• ISSN: 18809014
• ISSN: 05328799
• NDL BIB ID: 11013980
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11013980
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed