Mössbauer study of iron carbide nanoparticles produced by laser ablation in alcohols

Amagasa, Shota; Nishida, Naoki; Kobayashi, Yoshio; Yamada, Yasuhiro

doi:10.1007/s10751-016-1322-5

Cited by 10 publications

(4 citation statements)

References 16 publications

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“…Fe 3 C is an iron carbide, and γ-Fe and α-Fe are metallic iron. The room temperature IS values of iron in the carbide are in the range of 0.17-0.19 mm/s, and the values agree closely with those reported previously [11][12][13].…”

Section: Resultssupporting

confidence: 90%

Mössbauer and Raman spectroscopic characterization of iron and carbon in iron-loaded Japanese cypress charcoal

et al. 2020

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Japanese cypress (Chamaecyparis obtusa) wood powder impregnated with Fe3+ ions was carbonized using one-step and two-step procedures, and the iron-loaded charcoal was examined using Mössbauer and Raman spectroscopy to elucidate the physicochemical states of iron and carbon after carbonization at various temperatures. In the one-step procedure, the Mössbauer spectra confirmed that charcoal carbonized at 750 °C and 800 °C contained Fe3C, suggesting that the reduction of Fe3+ started at lower than 750 °C. The content of Fe3C increased substantially in charcoal carbonized at 850 °C and 900 °C, and metallic iron (γ-Fe and/or α-Fe) was also detected in these charcoal samples. Raman spectral line-shapes of the charcoal carbonized at 750 °C and 800 °C were notably different from those of charcoal carbonized at 850 °C and 900 °C, which indicated that crystallization of carbon progressed rapidly in the temperature range 800–850 °C. The changes in Raman spectra probably corresponded to those in the Mössbauer spectra, namely, the graphitization was closely related to the reduction of Fe3+. The degree of graphitization in the charcoal carbonized at 850 °C using the two-step procedure was higher than that using the one-step procedure. Mössbauer spectra suggested that the two-step carbonization enhances the yield of ferromagnetic iron species in iron-loaded charcoal.

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Section: Resultssupporting

confidence: 90%

Mössbauer and Raman spectroscopic characterization of iron and carbon in iron-loaded Japanese cypress charcoal

et al. 2020

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“…The broadening of the resonance lines can be related to lack of long-range ordering arisen due to immiscibility of C [51][52][53]. This spectrum was fitted using one sextet with a hyperfine field (B hf ) of 25.65 ± 0.34 T. A B hf = 26-30 T depending on C content can be observed in amorphous Fe-C alloys [54,55]. This also in a way confirms the amorphous nature of the sample deposited at T s = 300 K. In comparison to this, the spectrum of the sample deposited at T s = 523 K shows narrow resonance lines.…”

Section: Magnetic Structurementioning

confidence: 99%

Structural and magnetic properties of co-sputtered Fe0.8C0.2 thin films

Kumar

Reddy

Ganesan

et al. 2020

Phys. Rev. Materials

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We studied the structural and magnetic properties of Fe 0.8 C 0.2 thin films deposited by co-sputtering of Fe and C targets in a direct current magnetron sputtering (dcMS) process at a substrate temperature (T s ) of 300, 523, and 773 K. The structure and morphology were measured using x-ray diffraction (XRD), x-ray absorption nearedge spectroscopy (XANES) at Fe L and C K edges and atomic/magnetic force microscopy (AFM, MFM). An ultrathin (3-nm) 57 Fe 0.8C0.2 layer, placed between relatively thick Fe 0.8 C 0.2 layers was used to estimate Fe selfdiffusion taking place during growth at different T s using depth profiling measurements. Such 57 Fe 0.8C0.2 layer was also used for 57 Fe conversion electron Mössbauer spectroscopy (CEMS) and nuclear resonance scattering (NRS) measurements, yielding the magnetic structure of this ultrathin layer. We found from XRD measurements that the structure formed at low T s (300 K) is analogous to Fe-based amorphous alloy and at high T s (773 K), predominantly a Fe 3 C phase has been formed. Interestingly, at an intermediate T s (523 K), a clear presence of Fe 4 C (along with Fe 3 C and Fe) can be seen from the NRS spectra. The microstructure obtained from AFM images was found to be in agreement with XRD results. MFM results also agree well with NRS as the presence of multi-magnetic components can be clearly seen in the sample grown at T s = 523 K. The information about the hybridization between Fe and C, obtained from Fe L-and C K-edge XANES also supports the results obtained from other measurements. In essence, from this work, a possibility for experimental realization of Fe 4 C has been demonstrated. It can be anticipated that by further fine-tuning of the deposition conditions, even single-phase Fe 4 C can be realized which hitherto remains an experimental challenge.

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“…Nanoparticles consisting of α-Fe, γ-Fe, iron carbide, and amorphous iron carbide, with no trace of iron oxides, were successfully produced by laser ablation in organic solvents (pentane, hexane, or decane). 73) Laser ablation in liquid is typically performed in a stagnant solvent as discussed above. However, if the particles remain suspended in the solvent after production, they can deteriorate because of the effects of prolonged laser irradiation (LI).…”

Section: Laser Ablation In Organic Solvents To Produce Iron Carbidesmentioning

confidence: 99%

Iron-based Nanoparticles and Their Mössbauer Spectra

Yamada

Nishida

2019

RADIOISOTOPES

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This review describes the synthesis of iron-based nanoparticles. Iron oxyhydroxide, iron oxide, iron carbide, and iron sulfide nanoparticles have been produced using various methods. Feroxyhyte δ-FeOOH nanoparticles were produced by the oxidation of precipitates obtained by hydrazine reduction of iron chloride. Similar nanocomposites doped with foreign atoms (Ag, Cu, or Zn) have been produced as well. Iron oxide (γ-Fe 2 O 3 ) nanoparticles have been produced by a polyol method. When a sulfide source was added into the solution during synthesis, iron sulfide nanoparticles were obtained. Using this technique, a metastable trivalent iron sulfide (Fe 2 S 3 ) was successfully synthesized. Amorphous iron/carbon particles were obtained by the sonochemical synthesis of ferrocene in diphenylmethane. Subsequent heating of the amorphous particles produced Fe 3 C, α-Fe, and γ-Fe nanoparticles. Laser ablation of iron metal in an organic solvent produced iron carbide nanoparticles. The reaction mechanism and the structures of the nanoparticles were studied using Mössbauer spectroscopy as well as X-ray diffraction and transmission electron microscopy.Key Words: iron-based nanoparticles, Mössbauer spectroscopy, polyol methods, sonochemistry, laser ablation in liquid doped with foreign atoms are intriguing because doi: 10.3769/radioisotopes.68.125 126 Vol. 68,No. 3 RADIOISOTOPES they are known to exhibit unique magnetic and optical properties. 10) A variety of methods have been employed to synthesize nanoparticles; e.g. the hydrazine reduction method, polyol method, sonochemical method, and laser ablation in a liquid. Our recent results, mainly based on Mössbauer spectroscopy, will be presented in the following sections. Iron oxide nanoparticles and their compositeswith foreign atoms 2 1 Feroxyhyte nanoparticles Feroxyhyte (δ-FeOOH), a very intriguing species of the iron oxide family, is the only ferric oxyhy-droxide that exhibits significant magnetization at room temperature. 11) Generally, feroxyhyte is not as abundant as other iron oxides/oxyhydroxides in nature, and hard to synthesize because of its instability.Feroxyhyte nanoparticles were found to be a promising photocatalyst for hydrogen production, 12) and the enhancement of the Fenton-like photocatalytic response of feroxyhyte nanoflake/carbon nanodot nanohybrids was reported. 13) Polyakov et al. synthesized anisotropic feroxyhyte nanoparticles in the presence of humic substances. 14)Recently, we synthesized extremely small spherical feroxyhyte nanoparticles stabilized with gela- Fig. 1 (a) X-ray diffraction pattern, (b) TEM image, (c) histogram of diameters and (d) HR-TEM image of the feroxyhyte nanoparticles.

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Mössbauer study of iron carbide nanoparticles produced by laser ablation in alcohols

Cited by 10 publications

References 16 publications

Mössbauer and Raman spectroscopic characterization of iron and carbon in iron-loaded Japanese cypress charcoal

Mössbauer and Raman spectroscopic characterization of iron and carbon in iron-loaded Japanese cypress charcoal

Structural and magnetic properties of co-sputtered Fe0.8C0.2 thin films

Iron-based Nanoparticles and Their Mössbauer Spectra

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