Aluminium X-ray absorption Near Edge Structure in model compounds and Earth's surface minerals

Ildefonse, Philippe; Cabaret, Delphine; Sainctavit, Philippe; Calas, Georges; Flank, A.‐M.; Lagarde, P.

doi:10.1007/s002690050093

Cited by 156 publications

(189 citation statements)

References 27 publications

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“…This provides strong evidence that the surface phases were formed on the loess grains following deposition by interaction with A1 and Si present in groundwater. The Al XANES spectra for the loess samples are similar to both the montmorillonite and muscovite spectra but show closest agreement with the previously published XANES spectra of dioctahedral illite/smectite mixed layer minerals (Ildefonse et al, 1998), although the coating contains less K than any of these phases based on XPS analysis.…”

Section: Figuresupporting

confidence: 71%

“…The spectra are in good agreement with previous studies (Brown et at., 1983;McKeown et al, 1985;Wong et al, 1994;Ildefonse et al, 1994;Li et al;1995;FrOba et al, 1996;Ildefonse et al, 1998) and show energy resolution with the YB66 monochromator comparable to that obtained using (10]0) quartz monochromator crystals in earlier studies (e.g., (Brown et al, 1983)). …”

Section: Model Compoundssupporting

confidence: 56%

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XANES studies at the Al K-edge of aluminium-rich surface phases in the soil environment

Doyle¹,

Traina²,

Ruppert³

et al. 1999

J Synchrotron Rad

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Aluminum is highly abundant in the Earth's crust where it is present in a wide variety of primary and secondary aluminosilicate minerals, amorphous phases, and aqueous solution species. The speciation and coordination of AI in many of these phases, particularly those that are X-ray amorphous or present as thin surface coatings, are often unknown or based on indirect methods. We have utilized aluminum K-edge XANES in a study of the nature of several such phases, specifically the aluminum rich phases present in soils on the surfaces of quartz and feldspar grains in loess, and aluminum substitution in iron oxyhydroxides.In addition, the sorption products of AI-(oxy)hydroxides on synthetic t~-A1203 (0001) surfaces were investigated along with model compounds. Analysis of our data suggests that the Al-rich surface phase on quartz grains in loess is gibbsite-like, while AI sorbed on synthetic quartz is boehmitelike. Surprisingly, AI substituted in goethite appears to be more similar to gibbsite than to diaspore, which is isostructural with goethite. The experimental data for corundum and Linde alumina show good agreement with calculated AI K-edge spectra from a developmental version of the full multiple scattering code FEFF8 using clusters of up to 66 atoms

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Section: Figuresupporting

confidence: 71%

Section: Model Compoundssupporting

confidence: 56%

XANES studies at the Al K-edge of aluminium-rich surface phases in the soil environment

Doyle¹,

Traina²,

Ruppert³

et al. 1999

J Synchrotron Rad

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“…STXM methodology was similar to that discussed previously. [88][89][90][91] Single-energy images and Al K-edge XANES spectra were acquired using the STXM instrument at the Molecular Environmental Science (MES) beamline 11.0.2 at the Advanced Light Source (ALS), which was operated in topoff mode at 500 mA, in a ∼0.5 atm Hefilled chamber. [61][62][63] The beamline used photons from an elliptically polarizing undulator that delivers photons in the 100 to 2000 eV energy range to a variable-included-angle plane-grating monochromator.…”

Section: Methodsmentioning

confidence: 99%

“…Previous Al K-edge analyses of α-Al2O3 and other aluminum oxides and minerals have provided frameworks for assigning transitions in the Al K-edge XAS by constructing models for Al-O bonding in both tetrahedral or octahedral coordination environments. 27,[87][88][89][90][91] A similar approach was applied here to develop interpretations of the Al K-edge spectra of α-and γ-Al2O3 that could be related to the nanoparticle systems.…”

Section: Figure 4 Al K-edge Xas Of Al Metal (Black Circles) Comparedmentioning

confidence: 99%

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Chemical and Morphological Inhomogeneity of Aluminum Metal and Oxides from Soft X-ray Spectromicroscopy

Altman

Pemmaraju²,

Alayoǧlu³

et al. 2017

Inorg. Chem.

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ABSTRACT. Oxygen and aluminum K-edge X-ray absorption spectroscopy (XAS), imaging from a scanning transmission X-ray microscope (STXM), and first principles calculations were used to probe the composition and morphology of bulk aluminum metal, α-and γ-Al2O3, and several types of aluminum nanoparticles. The imaging results agreed with earlier transmission electron microscopy studies that showed a 2 to 5 nm thick layer of Al2O3 on all the Al surfaces. Spectral interpretations were guided by examination of the calculated transition energies, which agreed well with the spectroscopic measurements. Features observed in the experimental O and Al K-edge XAS were used to determine the chemical structure and phase of the Al2O3 on the aluminum surfaces. For unprotected 18 and 100 nm Al nanoparticles, this analysis revealed an oxide layer that was similar to γ-Al2O3 and comprised of both tetrahedral and octahedral Al coordination sites. For oleic-acid protected Al nanoparticles, only tetrahedral Al oxide coordination sites were observed.The results were correlated to trends in the reactivity of the different materials, which suggests that the structures of different Al2O3 layers have an important role in the accessibility of the underlying Al metal towards further oxidation.Combined, the Al K-edge XAS and STXM results provided detailed chemical information that was not obtained from powder X-ray diffraction or imaging from a transmission electron microscope.

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X‐ray Imaging of Zeolite Particles at the Nanoscale: Influence of Steaming on the State of Aluminum and the Methanol‐To‐Olefin Reaction

et al. 2012

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Aluminium X-ray absorption Near Edge Structure in model compounds and Earth's surface minerals

Cited by 156 publications

References 27 publications

XANES studies at the Al K-edge of aluminium-rich surface phases in the soil environment

XANES studies at the Al K-edge of aluminium-rich surface phases in the soil environment

Chemical and Morphological Inhomogeneity of Aluminum Metal and Oxides from Soft X-ray Spectromicroscopy

X‐ray Imaging of Zeolite Particles at the Nanoscale: Influence of Steaming on the State of Aluminum and the Methanol‐To‐Olefin Reaction

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