The crystal and melt structure of spinel and alumina at high temperature: An in-situ XANES study at the Al and Mg K-edge

Neuville, Daniel R.; Ligny, Dominique de; Cormier, Laurent; Henderson, Grant S.; Roux, Jacques; Flank, A.‐M.; Lagarde, P.

doi:10.1016/j.gca.2009.02.033

Cited by 46 publications

(34 citation statements)

References 59 publications

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“…It is well known that Mg 2+ element forms a very stable spinel with alumina and that it is not possible to quench this MgAl 2 O 4 composition or other magnesium aluminate compositions using fast quench. This crystalline phase shows that Mg and Al are in 4 and 6 fold coordination respectively at room temperature and shows an inversion of the site with temperature [20][21][22]. In SrO-Al 2 O 3 and BaO-Al 2 O 3 systems, the melting temperatures are higher than in the CaO-Al 2 O 3 system in agreement with those determined in the alkaline-earth aluminosilicate systems, which increase with the size of alkaline-earth cation [23].…”

Section: Introductionsupporting

confidence: 76%

Raman and 27Al NMR structure investigations of aluminate glasses: (1−x)Al2O3−x MO, with M=Ca, Sr, Ba and 0.5<x<0.75)

Licheron

Montouillout

Millot

et al. 2011

Journal of Non-Crystalline Solids

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Section: Introductionsupporting

confidence: 76%

Raman and 27Al NMR structure investigations of aluminate glasses: (1−x)Al2O3−x MO, with M=Ca, Sr, Ba and 0.5<x<0.75)

Licheron

Montouillout

Millot

et al. 2011

Journal of Non-Crystalline Solids

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“…The first spinel peak is 1567 eV (Neuville et al. ); the first corundum peak (also CN = 6) is at 1568 ± 0.6 eV (Li et al. ; Ildefonse et al.…”

Section: Results and Discussion Ii: Analyses Of Three Tracks Of Probamentioning

confidence: 99%

“…The lower 1565 eV peak corresponds to four-fold symmetry and could be due to transfer to CN = 4 in high-temperature inverted spinel or Al-rich spinel (Neuville et al 2009); or it could be due to an admixture of CN = 4 aluminosilicate, for example, we show oligoclase (80% albite, 20% anorthite) in Fig. 11.…”

Section: Stxm1 Characterization Of Orionmentioning

confidence: 88%

“…The Al spectrum is a reasonable match for a spinel-like structure (coordination number, CN = 6), but shifted approximately 2 eV toward lower energy compared with the spinel standard (MgAl 2 O 4 ). The first spinel peak is 1567 eV (Neuville et al 2009); the first corundum peak (also CN = 6) is at 1568 AE 0.6 eV (Li et al 1995;Ildefonse et al 1998;Mottana et al 1998;Neuville et al 2009).…”

Section: Stxm1 Characterization Of Orionmentioning

confidence: 95%

“…Al spectra acquisitions, typically 0.2 eV steps across the Al K-edge, were energy calibrated against Al metal (at 1559 eV) and published spectra Marcelli et al 2000;Neuville et al 2009).…”

Section: Energy Calibrationmentioning

confidence: 99%

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Stardust Interstellar Preliminary Examination IV: Scanning transmission X‐ray microscopy analyses of impact features in the Stardust Interstellar Dust Collector

Butterworth¹,

Westphal²,

Tyliszczak³

et al. 2014

Meteorit & Planetary Scien

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We report the quantitative characterization by synchrotron soft X-ray spectroscopy of 31 potential impact features in the aerogel capture medium of the Stardust Interstellar Dust Collector. Samples were analyzed in aerogel by acquiring high spatial resolution maps and high energy-resolution spectra of major rock-forming elements Mg, Al, Si, Fe, and others. We developed diagnostic screening tests to reject spacecraft secondary ejecta and terrestrial contaminants from further consideration as interstellar dust candidates. The results support an extraterrestrial origin for three interstellar candidates: I1043,1,30 (Orion) is a 3 pg particle with Mg-spinel, forsterite, and an iron-bearing phase. I1047,1,34 (Hylabrook) is a 4 pg particle comprising an olivine core surrounded by low-density, amorphous Mg-silicate and amorphous Fe, Cr, and Mn phases. I1003,1,40 (Sorok) has the track morphology of a high-speed impact, but contains no detectable residue that is convincingly distinguishable from the background aerogel. Twenty-two samples with an anthropogenic origin were rejected, including four secondary ejecta from impacts on the Stardust spacecraft aft solar panels, nine ejecta from secondary impacts on the Stardust Sample Return Capsule, and nine contaminants lacking evidence of an impact. Other samples in the collection included I1029,1,6, which contained surviving solar system impactor material. Four samples remained ambiguous: I1006,2,18, I1044,2,32, and I1092,2,38 were too dense for analysis, and we did not detect an intact projectile in I1044,3,33. We detected no radiation effects from the synchrotron soft X-ray analyses; however, we recorded the effects of synchrotron hard X-ray radiation on I1043,1,30 and I1047,1,34

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Theoretical Analysis of Fe K‐edge XANES on Mononitrosyl Iron Complex [(NO)Fe(S₂C₆H₄)₂][PPN]

Lee

Hsu

2013

J Chinese Chemical Soc

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X‐ray absorption spectroscopy (XAS) becomes one of the important techniques to characterize the active metal site of crystalline or non‐crystalline materials. The x‐ray absorption near structure (XANES) of Fe K‐edge is often used to monitor the variation of the oxidation states and the local geometric structures in a series of Fe complexes or in situ reactions such as synthetic catalysts and metalloproteins. We provide a detailed interpretation of Fe K‐edge XANES features on the mononitrosyl iron complex, [(NO)Fe(S2C6H4)2][PPN], based on the theoretical calculation results of FDM (finite difference method) and TDDFT (time‐dependent density functional theory). The pre‐edge peak is mainly the transition of 1s(Fe) → 3dz2(Fe)(mixing with 3pz(S)). The following rising edge to white line region is related to Fe‐S and Fe‐N bonding. To apply the results, we have studied the variation of XANES features with systematically changing of Fe‐N bond lengths. The increasing of Fe‐N bond lengths leads to the XANES feature shifting to lower energy owing to reducing the orbitals overlapped between Fe and N.

show abstract

The crystal and melt structure of spinel and alumina at high temperature: An in-situ XANES study at the Al and Mg K-edge

Cited by 46 publications

References 59 publications

Raman and 27Al NMR structure investigations of aluminate glasses: (1−x)Al2O3−x MO, with M=Ca, Sr, Ba and 0.5<x<0.75)

Raman and 27Al NMR structure investigations of aluminate glasses: (1−x)Al2O3−x MO, with M=Ca, Sr, Ba and 0.5<x<0.75)

Stardust Interstellar Preliminary Examination IV: Scanning transmission X‐ray microscopy analyses of impact features in the Stardust Interstellar Dust Collector

Theoretical Analysis of Fe K‐edge XANES on Mononitrosyl Iron Complex [(NO)Fe(S₂C₆H₄)₂][PPN]

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The crystal and melt structure of spinel and alumina at high temperature: An in-situ XANES study at the Al and Mg K-edge

Cited by 46 publications

References 59 publications

Raman and 27Al NMR structure investigations of aluminate glasses: (1−x)Al2O3−x MO, with M=Ca, Sr, Ba and 0.5<x<0.75)

Raman and 27Al NMR structure investigations of aluminate glasses: (1−x)Al2O3−x MO, with M=Ca, Sr, Ba and 0.5<x<0.75)

Stardust Interstellar Preliminary Examination IV: Scanning transmission X‐ray microscopy analyses of impact features in the Stardust Interstellar Dust Collector

Theoretical Analysis of Fe K‐edge XANES on Mononitrosyl Iron Complex [(NO)Fe(S2C6H4)2][PPN]

Contact Info

Product

Resources

About

Theoretical Analysis of Fe K‐edge XANES on Mononitrosyl Iron Complex [(NO)Fe(S₂C₆H₄)₂][PPN]