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Microstructure and magnetic properties of graphite-coated Gd nanocapsules

Applied Physics Letters, ISSN: 0003-6951, Vol: 94, Issue: 10
2009
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Metrics Details

  • Citations
    22
    • Citation Indexes
      22
  • Captures
    16

Article Description

Gd nanocapsules, which are stable in air with the protection of graphite shells, are prepared by a modified arc-discharge technique. A size-induced structural transformation from the hexagonal-close-packed (hcp) to the higher-symmetry face-centered-cubic structure is observed. The graphite-coated hcp-Gd nanocapsules display a blocked state below 35 K, superparamagnetism between 35 and 290 K, and typical paramagnetism above 290 K. The hcp-Gd nanocapsules have a magnetic-entropy change -Δ S of 48.8 J kg K at 6 K for an applied-field change from 1 to 7 T. © 2009 American Institute of Physics.

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