Bulk Metallic Glass-like Scattering Signal in Small Metallic Nanoparticles

作者: Simon J. L. Billinge , Simon J. L. Billinge , Marcel Miglierini , Diego Pontoni , Benjamin T. Diroll

DOI: 10.1021/NN501591G

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摘要: The atomic structure of Ni–Pd nanoparticles has been studied using pair distribution function (PDF) analysis X-ray total scattering data and with transmission electron microscopy (TEM). Larger have PDFs corresponding to the bulk face-centered cubic packing. However, smallest that strongly resemble those obtained from metallic glasses (BMGs). In fact, by simply scaling distance axis mean radius, curves may be collapsed onto each other PDF a glass sample. common wide range BMG materials, intermediate order fit damped single-frequency sine wave. When viewed in high-resolution TEM, these exhibit fringes typical seen small clusters icosahedral or decahedral order. These two seemingly contradictory results are reconciled calculating models icosahedra would consistent TEM. ...

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