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

Boi, F.S., Mountjoy, G., Luklinska, Z., Spillane, L., Karlsson, L.S., Wilson, R.M., Corrias, A., Baxendale, M. (2013) The origin of long-period lattice spacings observed in iron-carbide nanowires encapsulated by multiwall carbon nanotubes. Microscopy and Microanalysis, 19 (5). pp. 1298-1302. ISSN 1431-9276. (doi:10.1017/S1431927613001918) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1017/S1431927613001918

Abstract

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. © Microscopy Society of America 2013.

Item Type: Article
DOI/Identification number: 10.1017/S1431927613001918
Uncontrolled keywords: forbidden reflections, HRTEM, iron carbide, nanowire
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 16 Dec 2014 12:26 UTC
Last Modified: 29 May 2019 13:56 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46152 (The current URI for this page, for reference purposes)
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