Akaganeite Xrd
XRD pattern of akaganéite and other iron oxyhydroxides and oxides.
Akaganeite xrd. Akaganeite consists of 2 × 2 channels (referring to the width of the channels in octahedral units) built by edge-sharing double chains (Figure 2f). 34-1266, thus indicating the presence of pure akaganéite (β-FeO (OH)). XRD pattern of syn- thetic akaganeite matches well with that of β-FeOOH reference (JCPDS NO.
Furthermore, XRD can readily distinguish between different crystallographic modifications of phases that have the same chemical formula. Thus the 3.6 nm peak could be attributed to akaganeite and goethite and the smaller diameter pores to Fe(OH) 3. The interpretation of the XRD spectra indicated that the small particle size Fe(III) hydroxide is always formed in different concentrations, together with akaganeite and goethite.
ⓘ Akagane mine, Esashi ward, Oshu City, Iwate Prefecture, Japan The presence of akaganeite indicates high concentrations of chloride in an acidic environment (Ståhl et al. These tunnels 0.5 nm in cross section contain Cl − ions that stabilize the structure. The spelling akaganéite is incorrect (Burke, 08).
The presence of akaganéite is questionable because the characteristic diffraction line at 2 θ = 6° is weak while the other lines of akaganéite coincide with those of lepidocrocite and/or goethite. Abstract Synchrotron X-ray diffraction was used to monitor the hydrothermal precipitation of akaganeite (β -FeOOH) and its transformation to hematite (Fe 2 O 3) in situ. XRD patterns of akaganeite samples heated at 260 and 300 °C, clearly indicate that the akaganeite transformed into hematite.
Akaganeite is often described as the β phase of anhydrous ferric oxyhydroxide FeOOH, but some chloride (or fluoride) ions are normally included in the structure,, so a more accurate formula is FeO 0.3(OH) 1.167Cl 0.167. The experimental peaks of the uncalcined sample were perfectly matched with the theoretical data of the JCPDS card no. For example, the ferrous corrosion products goethite, lepidocrocite, feroxyhyte and akaganeite can be distinguished from each other, even though they all have the chemical formula FeO (OH).
Beta = 90.03° V = 337.43 Den(Calc)= 3.75. A = 10.587, b = 3.0311, c = 10.515, Z = 1;.
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