Formation of metastable iron carbide phases after high-fluence carbon ion implantation into iron at low temperatures

Königer, A.; Hammerl, C.; Zeitler, M.; Rauschenbach, B.

doi:10.1103/physrevb.55.8143

Cited by 58 publications

(40 citation statements)

References 11 publications

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“…Structure determination of e-Fe 2 C. After being subjected to LTFTS at 443 K for 20 min in a batchwise reactor (30 bar at RT, H 2 /CO/N 2 ¼ 64/32/4 by volume, polyethylene glycol (PEG200, M w ¼ 200) as the reaction medium 34,35 ), the phase composition was examined on a synchrotron radiation diffractometer, which is well suited to study the weak diffractions of iron carbides than on conventional diffractometer 12 . In the synchrotron XRD pattern shown as Fig.…”

Section: Resultsmentioning

confidence: 99%

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ε-Iron carbide as a low-temperature Fischer–Tropsch synthesis catalyst

et al. 2014

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e-Iron carbide has been predicted to be promising for low-temperature Fischer-Tropsch synthesis (LTFTS) targeting liquid fuel production. However, directional carbidation of metallic iron to e-iron carbide is challenging due to kinetic hindrance. Here we show how rapidly quenched skeletal iron featuring nanocrystalline dimensions, low coordination number and an expanded lattice may solve this problem. We find that the carbidation of rapidly quenched skeletal iron occurs readily in situ during LTFTS at 423-473 K, giving an e-iron carbidedominant catalyst that exhibits superior activity to literature iron and cobalt catalysts, and comparable to more expensive noble ruthenium catalyst, coupled with high selectivity to liquid fuels and robustness without the aid of electronic or structural promoters. This finding may permit the development of an advanced energy-efficient and clean fuel-oriented FTS process on the basis of a cost-effective iron catalyst.

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Section: Resultsmentioning

confidence: 99%

“…The carbon atoms in y-Fe 3 C and w-Fe 5 C 2 are situated in trigonal prismatic (TP) interstices. The trigonal prisms are similar, but the ways for their organization in y-Fe 3 C and w-Fe 5 C 2 (TP-carbides) are different 12 . For e 0 -Fe 2.2 C and e-Fe 2 C, the carbon atoms are situated in octahedral (O) interstices 5 , so they are also termed as O-carbides.…”

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confidence: 90%

ε-Iron carbide as a low-temperature Fischer–Tropsch synthesis catalyst

et al. 2014

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“…This indicates that in the discussion of formation of the compounds one must consider the difference in the entropies of lattice vibration at the formation temperature (T $ 500-1200 K), while the entropy from (chemical and structural) defects in the lattices can be ignored [49][50][51]. Therefore, a complete understanding about the stability of c-Fe 23 C 6 requires not only the formation enthalpy at 0 K and 0 Pa, but also the lattice vibration (phonon spectrum), and even the magnon-phonon coupling at the formation temperature.…”

Section: Formation and Stability Of C-fe 23 C 6 In Steels And Mineralsmentioning

confidence: 99%

Stability, structure and electronic properties of γ-Fe23C6 from first-principles theory

et al. 2010

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“…7(c)). A diffraction analysis showed that they are interstitial carbides of two types, x-carbide Fe 2.4 C with hexagonal structure or Z-carbide Fe 2 C with orthorhombic structure [19]. Figs.…”

Section: Microstructure Revealed By Electron Microscopymentioning

confidence: 98%