The origin of long-period lattice spacings observed in iron-carbide nanowires encapsulated by multiwall carbon nanotubes

التفاصيل البيبلوغرافية
العنوان: The origin of long-period lattice spacings observed in iron-carbide nanowires encapsulated by multiwall carbon nanotubes
المؤلفون: Lisa S. Karlsson, Anna Corrias, Liam Spillane, Z. B. Luklinska, Mark Baxendale, Gavin Mountjoy, Filippo S. Boi, Rory M. Wilson
المصدر: Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada. 19(5)
سنة النشر: 2013
مصطلحات موضوعية: Materials science, Scattering, Electron energy loss spectroscopy, Nanowire, Space group, Nanotechnology, Carbon nanotube, Molecular physics, law.invention, Electron diffraction, law, Orthorhombic crystal system, High-resolution transmission electron microscopy, Instrumentation
الوصف: Structures comprising single-crystal, iron-carbon-based nanowires encapsulated by multiwall carbon nanotubes self-organize on inert substrates exposed to the products of ferrocene pyrolysis at high temperature. The most commonly observed encapsulated phases are Fe3C, α-Fe, and γ-Fe. The observation of anomalously long-period lattice spacings in these nanowires has caused confusion since reflections from lattice spacings of ≥0.4 nm are kinematically forbidden for Fe3C, most of the rarely observed, less stable carbides, α-Fe, and γ-Fe. Through high-resolution electron microscopy, selective area electron diffraction, and electron energy loss spectroscopy we demonstrate that the observed long-period lattice spacings of 0.49, 0.66, and 0.44 nm correspond to reflections from the (100), (010), and (001) planes of orthorhombic Fe3C (space group Pnma). Observation of these forbidden reflections results from dynamic scattering of the incident beam as first observed in bulk Fe3C crystals. With small amounts of beam tilt these reflections can have significant intensities for crystals containing glide planes such as Fe3C with space groups Pnma or Pbmn.
تدمد: 1435-8115
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12eea9ff20e40b6c8dd89e66a834d40b
https://pubmed.ncbi.nlm.nih.gov/23816334
Rights: CLOSED
رقم الانضمام: edsair.doi.dedup.....12eea9ff20e40b6c8dd89e66a834d40b
قاعدة البيانات: OpenAIRE