Effect of Pt Substitution by Cu on Structural and Morphological Changes in Fe-Pt Nanoparticles during Annealing as Studied by <I>In-situ</I> Transmission Electron Microscopy

• Nakanishi Masatoshi

  Department of Quantum Engineering, Nagoya University Analysis Technology Center, FUJIFILM Corporation

• Furusawa Gen-ichi

  Analysis Technology Center, FUJIFILM Corporation

• Waki Kokichi

  Frontier Core Technology Laboratories, FUJIFILM Corporation

• Hattori Yasushi

  Recording Media Research & Development Laboratories, FUJIFILM Corporation

• Kamino Takeo

  Naka Application Center, Hitachi High-Technologies Corporation

• Sasaki Katsuhiro

  Department of Quantum Engineering, Nagoya University

• Kuroda Kotaro

  Department of Quantum Engineering, Nagoya University

• Saka Hiroyasu

  Department of Quantum Engineering, Nagoya University

Bibliographic Information

Other Title

• Effect of Pt substitution by Cu on structural and morphological changes in Fe-Pt nanoparticles during annealing as studied by in-situ transmission electron microscopy

Abstract

Effects of substitution of Pt by Cu on the structural and morphological changes of Fe-Pt nanoparticles with chemical homogeneity and mono-dispersion, which were synthesized by the reverse micelle method, have been investigated by in-situ electron diffraction and HREM observation. In the Fe-Pt particles, initially with a chemically disordered face-centered cubic phase (A1), the phase transformation from A1 to a chemically ordered face-centered tetragonal phase (L1₀) took place between 650 and 680°C. Polycrystalline Fe-Pt particles were reconstructed into A1 single crystals between 550 and 650°C, followed by phase transformation from A1 to L1₀. The coalescence began almost concurrently with the phase transformation, i.e., between 650 and 680°C. Then, they turned to round-shaped single crystalline particles between 680 and 720°C. In the Fe(Pt,Cu) particles, the phase transformation from A1 to L1₀ occurred between 550 and 600°C. Same processes, that is, the reconstruction to single crystals, the phase transformation from A1 to L1₀, the coalescence and the round-shaped particle formation were also observed in the Fe(Pt,Cu) nanoparticles. The temperatures, at which these processes took place, were substantially lower than those for the Fe-Pt nanoparticles.

Journal

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 48 (10), 2572-2579, 2007

  The Japan Institute of Metals and Materials

Keywords

• <I>In-situ</I> electron diffraction
• <I>In-situ</I> high-resolution electron microscopy (HREM) observation
• FePt
• Fe(Pt
• Cu)
• nanoparticle
• phase diagram
• phase transformation
• coalescence

Details

• CRID: 1390001204249281280
• NII Article ID: 10019955848
• NII Article ID: 130004453350
• NII Book ID: AA1151294X
• DOI: 10.2320/matertrans.md200710
• ISSN: 13475320
• ISSN: 13459678
• NDL BIB ID: 8931368
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I8931368
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/48/10/48_MD200710/_pdf
• Text Lang: en
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed