Wet chemical synthesis of zinc-iron oxide nanocomposite

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

doi:10.1007/s10751-017-1442-6

Cited by 7 publications

(5 citation statements)

References 12 publications

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“…Here, we discussed the Mössbauer spectra of some of the IONCs to extract valuable information on the local structure and magnetic ordering. People have studied Fe 3 O 4 /ZnO nanocomposite for quite a while [ 87 , 88 ]. However, there are some dissimilarities in result of the Mössbauer spectra of ZnO/Fe 3 O 4 NC.…”

Section: Discussionmentioning

confidence: 99%

Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review

Wareppam

Кузманн

Garg

et al. 2022

Journal of Materials Research

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Pure and doped iron oxide and hydroxide nanoparticles are highly potential materials for biological, environment, energy and other technological applications. On demand of the applications, single phase as well as multiple phase of different polymorphs or composites of iron oxides with compatible materials for example, zeolite, SiO 2 , or Au are prepared. The properties of the as-synthesized nanoparticles are predominantly dictated by the local structure and the distribution of the cations. Mössbauer spectroscopy is a perfect and efficient characterization technique to investigate the local structure of the Mössbauer-active element such as Fe, Au, and Sn. In the present review, the local structure transformation on the optimization of the magnetite coexisted with iron hydroxides, spin dynamics of the bare, caped, core–shell and the composites of iron oxide nanoparticles (IONPs), dipole–dipole interactions and the diffusion of IONPs were discussed, based on the findings using Mössbauer spectroscopy. Graphical abstract

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Section: Discussionmentioning

confidence: 99%

Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review

Wareppam

Кузманн

Garg

et al. 2022

Journal of Materials Research

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“…A tetrahedral site preference was observed before for zinc-doped magnetite. , The hyperfine magnetic field of the octahedral sites decreased in the Zn-MG catalyst (44.4 T), which points to zinc incorporation in octahedral sites as well. Zinc can occupy both the tetrahedral and octahedral sites of magnetite at high zinc content and it has been pointed out before that the preparation procedure can influence the site preference . The incorporation of divalent zinc into the tetrahedral sites of magnetite where it replaces trivalent iron, would lead to a charge imbalance.…”

Section: Resultsmentioning

confidence: 99%

“…Zinc can occupy both the tetrahedral and octahedral sites of magnetite at high zinc content 41 and it has been pointed out before that the preparation procedure can influence the site preference. 42 The incorporation of divalent zinc into the tetrahedral sites of magnetite where it replaces trivalent iron, would lead to a charge imbalance. Wen et al 43 proposed that the charge imbalance can be resolved by partial oxidation of Fe 2+ to Fe 3+ in the octahedral sites.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Substituting Chromium in Iron-Based Catalysts for the High-Temperature Water–Gas Shift Reaction

et al. 2022

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A set of doped iron oxides (chromium, aluminum, gallium, indium, manganese, zinc, niobium) were prepared by a one-step coprecipitation/calcination approach evaluated for their WGS activity under industrially relevant conditions and characterized in detail. The WGS activity after ageing the doped catalyst for 4 days at 25 bar follows the order chromium ≈ aluminum > gallium > indium > manganese > zinc > niobium for copper-codoped catalysts. The activated catalysts predominantly consist of magnetite, irrespective of the dopant. Mössbauer spectra of aged catalysts showed that aluminum and zinc occupy both tetrahedral and octahedral sites of magnetite, while chromium, gallium, indium, manganese, and niobium preferentially substitute octahedral iron. The incorporation of trivalent metal ions of similar size to octahedral Fe3+ (i.e., chromium, aluminum, gallium) results in moderate to high CO conversion, irrespective of incorporation in tetrahedral or octahedral sites. The substitution of Fe2+ with Mn2+ results in an increased Fe3+/Fe2+ ratio. Incorporation of Zn2+ in tetrahedral sites (replacing Fe3+ ions) leads to a complex structure where the charge balance is compensated from the octahedral sites. Separate dopant metal oxide phases were observed in indium- and niobium-doped catalysts. XPS shows that copper is present as a separate phase in activated copper-codoped catalysts. Aluminum is identified as the most promising promoter for substituting chromium in commercial high-temperature WGS catalysts on the basis of their similar high CO conversion although incorporation of these dopants into the magnetite structure differed substantially.

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“…Examples of the new pseudoscalar interactions probed include R-parity violating SUSY [5], leptoquarks [6], and the effects of charged Higgs bosons [2]. The π + →e + ν e decay measurement is also sensitive to the existence of heavy sterile neutrino mixing [7] through the R π measurement [8,9] and a direct additional peak search [10]. Figure 1 shows the schematic of the PIENU detector and the pion decay modes of interest.…”

Section: Introductionmentioning

confidence: 99%

Precision Measurement of the $\pi$$^+$$\rightarrow$$e^+$$\nu$$_e$ Branching Ratio in the PIENU Experiment

Ito¹,

Aguilar-Arevalo²,

Aoki³

et al. 2017

Proceedings of the 3rd International Symposium on “Quest for the Origin of Particles and the Universe" — PoS(KMI2017)

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Wet chemical synthesis of zinc-iron oxide nanocomposite

Cited by 7 publications

References 12 publications

Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review

Mössbauer spectroscopic investigations on iron oxides and modified nanostructures: A review

Substituting Chromium in Iron-Based Catalysts for the High-Temperature Water–Gas Shift Reaction

Precision Measurement of the $\pi$$^+$$\rightarrow$$e^+$$\nu$$_e$ Branching Ratio in the PIENU Experiment

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