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micro-XAFS spectra

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Series: Clay Minerals Society Workshop Lectures
Published: 01 January 2016
DOI: 10.1346/CMS-WLS-21-5
EISBN: 9781881208471
... are spot µXAFS spectra of arsenic for a point roughly within the center of summed areas 1-4 shown in the upper left figure. Also, for reference, XAFS spectra for As(-I) loellingite, As(III) schneiderhonite, and As(V) reference materials are shown. Comparison of XAFS spectra show that most of the McClean...
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Journal Article
Published: 01 June 2006
The Canadian Mineralogist (2006) 44 (3): 731-753.
... ranging from 1100 to 1700°C, i.e., from air to IW+4). Analysis of extended XAFS (EXAFS) spectra of these glasses indicates an average Mo–O distance of ~1.76(1) Å. No evidence for second-neighbor Si or Al around Mo was found in any of the glasses, confirming that molybdate moieties are not connected...
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Journal Article
Published: 01 June 2006
The Canadian Mineralogist (2006) 44 (3): 775-794.
... framework of NbO 6 ) and columbite (chains of edge-sharing NbO 6 : Santos et al. 2000). Structural details and chemical formulae for each of the model compounds can be found in Table 1 . Niobium XAFS spectra (both XANES and EXAFS regions) of the model compounds and Nb-bearing silicate glasses were...
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Journal Article
Published: 01 May 2007
American Mineralogist (2007) 92 (5-6): 761-770.
... inclusions by micro-XAFS . Canadian Mineralogist , 33 , 499 – 508 . Anderson , A.J. , Mayanovic , R.A. , and Bajt , S. ( 1998 ) A microbeam XAFS study of aqueous chlorozinc complexing to 430 °C in fluid inclusions from the Knaum granitic pegmatite, Saxonian granulite facies, Germany...
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Journal Article
Published: 01 November 2002
European Journal of Mineralogy (2002) 14 (6): 1075-1085.
.... , Sutton , S.R. , Schaefer , M.W. ( 1998 ): Fe 3+ distribution in oxidized olivines: A synchrotron micro-XANES study . Am. Mineral ., 83 , 1361 – 1365 . Dyar , M.D. , Delaney , J.S. , Sutton , S.R. ( 2001 ): Fe XANES spectra of iron-rich micas . Eur. J. Mineral ., 13...
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Journal Article
Published: 01 October 2009
American Mineralogist (2009) 94 (10): 1377-1387.
...Skya E. Fawcett; Robert A. Gordon; Heather E. Jamieson Abstract There are many challenges associated with collecting, processing, and interpreting high-energy XAS data. The most significant of these are broad spectra, minimal separation of edge positions, and high background owing to the Compton...
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Journal Article
Published: 01 July 2004
American Mineralogist (2004) 89 (7): 1004-1021.
...Jeffrey G. Catalano; Gordon E. Brown, Jr. Abstract As part of a larger study of uranium speciation in complex environmental samples, we have collected and analyzed the U L III -edge extended X-ray absorption fine structure (EXAFS) spectra of nineteen minerals and compounds containing uranium...
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Journal Article
Published: 01 July 2003
American Mineralogist (2003) 88 (7): 967-977.
... ) On the multipole character of the X-ray transitions in the pre-edge structure of Fe K absorption spectra . Physica Status Solidi B , 146 , 287 – 294 . Dyar , M.D. , Delaney , J.S. , Sutton , S.R. , and Schaefer , M.W. ( 1998 ) Fe 3+ distribution in oxidized olivine: a synchrotron micro...
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Journal Article
Published: 01 January 2012
American Mineralogist (2012) 97 (1): 100-109.
...-temperature using a multi-anvil press apparatus. X-ray absorption near edge spectroscopy (XANES) spectra collected at the U L III - and Th L III -edges using both micro- and macro-focused beams show U 4+ in the Al-rich CaSiO 3 perovskite. The structure of the U- and Th-bearing Al-rich CaSiO 3 perovskite...
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Journal Article
Published: 01 February 2008
American Mineralogist (2008) 93 (2-3): 414-425.
... to be partial occupancy of the third M site. For all micas, we recorded XAFS spectra on mosaics of carefully separated flakes oriented flat on a plastic support that could be rotated so as to account for the polarization of the synchrotron radiation beam, and we processed them on the basis of the AXANES theory...
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Journal Article
Published: 01 March 2016
European Journal of Mineralogy (2016) 28 (1): 179-187.
... solutions, 27 Al and 29 Si MAS NMR spectra were collected on synthetic crystals of composition Mg 3 (Al 0.915 V 0.085 ) 2 Si 3 O 12 and Mg 3 (Al 0.98 Cr 0.02 ) 2 Si 3 O 12 , and compared with the 29 Si MAS NMR spectrum of a Fe 3+ -bearing grossular garnet [Ca 3 (Al 0.956 Fe 3+ 0.044 ) 2 Si 3 O 12...
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Journal Article
Published: 01 April 2018
American Mineralogist (2018) 103 (4): 489-501.
... glasses provide a useful proxy for f O 2 . Fe K -edge micro-X-ray absorption near-edge structure (XANES) spectroscopy allows researchers to micro-analytically determine the Fe 3+ /∑Fe ratios of silicate glasses with high precision. In this study we characterize hydrous and anhydrous basalt glass standards...
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Journal Article
Published: 01 August 2010
European Journal of Mineralogy (2010) 22 (4): 535-546.
... material described earlier with a detailed study on the product of transformation at 1200 °C of friable chrysotile-asbestos and cement-asbestos, using (micro)Raman, (micro)FTIR, 57 Fe Mössbauer and XANES at the Fe K -edge. Micro-Raman spectra reveal that the absorption bands generated by chrysotile...
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Journal Article
Published: 01 July 2010
American Mineralogist (2010) 95 (7): 921-932.
... deposit (Starra, Queensland, Australia); and an As-rich magmatic fluid with a bulk composition similar to that typical of orogenic gold (Muiane pegmatite, Mozambique). Arsenic K -edge X-ray absorption spectra (XAS) were obtained from fluid inclusions at temperatures ranging from 25 to 200 °C, and compared...
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Journal Article
Published: 01 January 2008
American Mineralogist (2008) 93 (1): 228-234.
... optics and insertion devices give access to XAS spectra of light elements in different experimental conditions such as high pressure and high temperature, on the new LUCIA beamline installed at the Swiss Light Synchrotron (SLS) ( Flank et al. 2006 ). We adapted on this beamline a homemade micro furnace...
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Journal Article
Published: 01 December 2004
Mineralogical Magazine (2004) 68 (6): 859-869.
... Physique IV , 104 , 373 – 376 . Tonner , B.P. and Dunham , D. ( 1994 ) Submicron spatial-resolution of a micro-xafs electrostatic microscope with bending magnet radiation – performance assessments and prospects for aberration correction . Nuclear Instruments and Methods in Physics...
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Journal Article
Published: 01 March 2014
European Journal of Mineralogy (2014) 26 (1): 113-125.
.... Arsenic K -edge X-ray absorption near-edge-structure (XANES) spectra show that the dominant oxidation state is +3, and modeling of the extended X-ray absorption fine structure (EXAFS) spectra suggests that As 3+ mainly occupies the Si site. Single-crystal continuous-wave EPR spectra, measured before...
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Journal Article
Published: 01 September 2006
European Journal of Mineralogy (2006) 18 (5): 641-651.
... tetrahedral substitutions on tetrahedral environment for at least Si, H and F NMR spectra ( Fig. 7c ). A similar conclusion was reached by Martin et al. , (1996) using XAFS and FTIR spectroscopy, who showed the strong influence of Ge substitutions for tetrahedral Si in synthetic talc. E...
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Journal Article
Published: 01 November 2006
American Mineralogist (2006) 91 (11-12): 1783-1793.
...Kim N. Dalby; Penelope L. King Abstract Eight silicate unit vibrational modes were identified in a suite of PbO-SiO 2 glasses using micro-reflectance Fourier Transform infrared (μR-FTIR) spectra that were transformed using the Kramers-Kronig relation. The transformed FTIR spectra, in the 800–1200...
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Journal Article
Published: 01 May 2007
American Mineralogist (2007) 92 (5-6): 966-972.
...Sigrid Griet Eeckhout; Nathalie Bolfan-Casanova; Catherine McCammon; Stephan Klemme; Elodie Amiguet Abstract Cr K -edge X-ray absorption near-edge structure (XANES) spectra were recorded on Cr:MgO periclase and Cr:(Mg,Fe)O ferropericlase synthesized at different pressures (4 and 12 GPa...
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