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Chemically ordered decahedral FePt nanocrystals observed by electron microscopy

Zi-An Li, M. Spasova, Q. M. Ramasse, M. E. Gruner, C. Kisielowski, and M. Farle
Phys. Rev. B 89, 161406(R) – Published 24 April 2014
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    Abstract

    The crystal structure of FePt nanoparticles of mean size of 6 nm produced by gas-phase condensation is characterized using a combination of high-resolution transmission electron microscopy (HRTEM) and high-angle annular dark field (HAADF) imaging in scanning transmission electron microscopy (STEM). These FePt nanoparticles are found to be chemically ordered, decahedral shaped, and Pt enriched at the surfaces. The experimentally determined crystallographic lattice constants and distribution of Fe and Pt atoms are compared with first-principles calculations of ordered decahedral FePt nanoparticles to confirm the discovery of a unique decahedral structure with Fe/Pt ordering and Pt surface segregation.

      • Received 5 August 2013
      • Revised 31 March 2014

      DOI:https://doi.org/10.1103/PhysRevB.89.161406

      ©2014 American Physical Society

      Authors & Affiliations

      Zi-An Li1, M. Spasova1, Q. M. Ramasse2, M. E. Gruner1, C. Kisielowski3, and M. Farle1,*

      • 1Faculty of Physics and Center for Nanointegration Duisburg-Essen (CeNIDE), University Duisburg-Essen, D-47048 Duisburg, Germany
      • 2SuperSTEM Laboratory, STFC Daresbury Campus, Keckwick Lane, Daresbury WA44AD, United Kingdom
      • 3National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA

      • *Corresponding author: michael.farle@uni-due.de

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      Issue

      Vol. 89, Iss. 16 — 15 April 2014

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