A study of nanostructures formed in the hydrogen reduction of Fe(OH)3

Abstract

A complex study of the hydrogen reduction of nanosized iron hydroxide Fe(OH) 3 at 400°C was performed. It was shown that, during the reduction of Fe(OH) 3 to iron metal α Fe, intermediate compounds such as Fe(OH) 2 , α FeOOH, β FeOOH, γ FeOOH, δ FeOOH, and FeO are formed along with stable iron oxides α Fe 2 O 3 , γ Fe 2 O 3 , and Fe 3 O 4 . A scheme of chemical and structural transformations that occur in the reduction of nanosized Fe(OH) 3 is presented. The scheme takes into account the possibility of the bifurcation mechanism of reaction development.

Catalytic Thermal Decomposition of NO2 by Iron(III) Nitrate Nonahydrate-Doped Poly(Vinylidene Difluoride)

“…Deconvolution of the spectrum gives δ 1 = 0.38 ± 0.02 mm·s –1 , Γ 1 = 0.35 ± 0.08 mm·s –1 , Δ E Q1 = 0.8 ± 0.2 mm·s –1 and δ 2 = 0.36 ± 0.01 mm·s –1 , Γ 2 = 0.30 ± 0.03 mm·s –1 , Δ E Q2 = 0.63 ± 0.03 mm·s –1 . The isomer shifts are consistent with Fe 3+ , − as expected from the fabrication conditions. The larger quadrupole coupling for site 1 is assigned to Fe 3+ located in amorphous regions, and site 2 is assigned to Fe 3+ located in β-phase regions of the thin film.…”

Size effects in ultrafine iron. New structures: 2D - 3D

“…Fields for the above-mentioned alloys can also be found in these dependencies. The magnetic field H= 365 kOe also meets in α-FeOOH (Baldokhin et al, 2012). Therefore, it is necessary that a more thorough study of the phenomen should be performed.…”

Magnetite and Other Fe-Oxide Nanoparticles

“…Iron can be found in nature in different crystalline and stoichiometric forms: ) Among them, the most interesting, from the application point of view, is magnetite, although for some application other Fe-based materials are found [8][9][10]. In recent years, due the increasing interest of magnetite in medicine and biology, a lot of work has been done to prepare core-shell structures able to better interact with the human body.…”

“…Magnetite NPs (Fe 3 O 4 ) are usually synthesized mixing ferric and ferrous ions (1:2 M ratio) in a basic solution (pH range [8][9][10][11][12][13][14] according to the following reaction:…”