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micro-XAFS spectra

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Journal Article
Published: 01 June 2006
The Canadian Mineralogist (2006) 44 (3): 731–753.
... oxide model compounds of known structure. Detailed analysis of the XAFS spectra of these compounds provides a more quantitative basis for interpreting the glass/melt XAFS spectra. Earlier papers in this series on incompatible, high-valence trace elements in silicate melts and glasses focused on Zr(IV...
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Journal Article
Published: 01 January 2012
American Mineralogist (2012) 97 (1): 100–109.
... higher than those expected in the Earth’s mantle (about 40 ppb of U and 80 ppb of Th; e.g., Turcotte et al. 2001 ) to enhance solid-solid reaction and diffusion processes and to allow collection of macro- and micro-XAFS spectra with a high enough signal/noise ratio. High- P and high- T synthesis...
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Journal Article
Published: 01 July 2011
American Mineralogist (2011) 96 (7): 1171–1181.
...-mail: mitunobu@u-shizuoka-ken.ac.jp 21 03 2011 16 07 2010 © 2011 American Mineralogist 2011 Antimony tripuhyite micro-XAFS micro-XRD HRTEM Antimony (Sb) is the ninth most mined metal for industrial uses worldwide ( Krachler et al. 2001 ; Filella et al. 2002...
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Journal Article
Published: 01 February 2008
Mineralogical Magazine (2008) 72 (1): 169–173.
... organisms and in plant tissue. A number of synchrotron X-ray methods, including bulk and micro-X-ray absorption fine structure (XAFS and μ-XAFS) spectroscopy, micro-X-ray fluorescence (μ-XRF) imaging, micro-X-ray diffraction (μ-XRD), scanning transmission X-ray microscopy (STXM), long-period X-ray standing...
Journal Article
Published: 01 April 2022
American Mineralogist (2022) 107 (4): 729–738.
...), epoxy embedded chips where the glass thickness was large compared to the sampling depth of V K -edge X-rays. Previous V K -edge XAFS analyses of these samples are described in Lanzirotti et al. (2018) , Sutton et al. (2005) , and Karner et al. (2006) . Vanadium K -edge XAFS spectra were...
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Journal Article
Journal: Elements
Published: 01 September 2005
Elements (2005) 1 (4): 217–221.
... regions of the spectra for the pH-dependent cadmium-biomass spectra (not shown here) indicate a decrease in the phosphorus signal and an increase in the carbon signal with increasing pH. The uranium XAFS results ( Kelly et al. 2002 ) indicate that at extremely low pH (1.67), the uranyl ion (UO 2 2...
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Journal Article
Published: 01 January 2002
Reviews in Mineralogy and Geochemistry (2002) 49 (1): 1–115.
... ; Welter et al. 1999 ). In addition to XAFS spectroscopy methods, SR-based micro-X-ray fluorescence spectroscopy ( Bertsch and Hunter 2001 ) and X-ray diffraction methods ( Parise 1999 ) are now commonly used in studies of earth and environmental materials. Less commonly used SR methods include VUV...
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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 February 2008
American Mineralogist (2008) 93 (2-3): 495–498.
... of a Mg K -edge XAFS study done on the same pyp-grs garnet samples used for the experiments at the Ca and Sc K -edges. Due to the experimental difficulties in studying light elements by EXAFS (see below), normally only the near edge region (XANES) of the absorption spectra has been used to study...
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Journal Article
Published: 01 June 2006
The Canadian Mineralogist (2006) 44 (3): 775–794.
... bath. Niobium XAFS spectra (both XANES and EXAFS regions) of the model compounds and Nb-bearing silicate glasses were collected at the Stanford Synchrotron Radiation Laboratory (SSRL) on wiggler beam stations 4–1 and 11–2. Room-temperature XAFS spectra were collected at the Nb K absorption...
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Journal Article
Journal: Elements
Published: 01 September 2005
Elements (2005) 1 (4): 211–216.
... from solution to a similar extent; however, these plants utilize vastly different mechanisms for metal storage and detoxification. Micro-XAFS was used to investigate the speciation of Co in the leaves of A. murale (Tappero et al. in review a). The chi spectra ( F ig . 4 b , inset) collected from...
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Journal Article
Published: 01 October 2000
The Canadian Mineralogist (2000) 38 (5): 1265–1281.
... , E.A. , Kim , K.H. , Brown , F.C. , Jiang , D.T. , Crozier , E.D. & Gordon , R.A. ( 1999 ): XAFS and micro-XAFS at the PNC–CAT beamlines . J. Synch. Rad . 6 , 347 – 349 . Heald , S.M. , Stern , E.A. , Brewe , D.L. , Crozier , E.D. , Jiang , D.T...
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Journal Article
Published: 01 December 2010
Clays and Clay Minerals (2010) 58 (6): 772–782.
... of ferrihydrite, with the remainder in a poorly crystalline Fe-bearing smectite. The XAFS spectra suggest that ferrihydrite in the 15 ka soil clay is more resistant to ammonium oxalate (AOD) extraction than is ferrihydrite in the younger materials. Fe in the poorly crystalline smectite is subject to dissolution...
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Journal Article
Published: 01 June 2011
The Canadian Mineralogist (2011) 49 (3): 809–822.
... reported herein, obtained from inductively coupled plasma – mass spectrometry (ICP–MS) analysis, synchrotron micro-X-ray fluorescence (μ-SXRF) mapping, As K-edge X-ray absorption fine structure (XAFS) spectroscopy, and single-crystal electron paramagnetic resonance spectroscopy (EPR), provide evidence...
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Journal Article
Published: 01 January 2002
Reviews in Mineralogy and Geochemistry (2002) 49 (1): 429–483.
... important consideration is the desire to obtain μXAFS spectra on individual components in a complex material such as a soil. The spatial resolution required depends on the scale of heterogeneity in the sample. Measurements on aggregates substantially larger than this heterogeneity scale can produce XAFS...
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Journal Article
Published: 01 April 2008
Mineralogical Magazine (2008) 72 (2): 667–681.
... are in agreement with recent data obtained using batch-reactor solubility techniques. The XAFS spectra analysis shows that hydroxy-chloride complexes, probably Sb(OH) 2 Cl 0 , are dominant both in the vapour and liquid phase in a salt-water system at acidic conditions. This first in situ XAFS study of element...
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Journal Article
Published: 01 January 2019
American Mineralogist (2019) 104 (1): 158–161.
... by the micro-beam traveling parallel to the gasket. ( c – d ) A stacked first derivative of the normalized XANES spectra ( c ) large volume and ( d ) HDAC data. Note the white line and the maximum of the first derivative shifts to lower energy with decreasing coordination number and ligand (S vs. O/Cl). (Color...
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Journal Article
Published: 01 June 2006
The Canadian Mineralogist (2006) 44 (3): 795–810.
.... The tin K -edge XAFS spectra for the oxidized glasses resemble that of eakerite [Ca 2 SnAl 2 Si 6 O 18 (OH) 2 ·2H 2 O]. Tetravalent Sn thus behaves in a similar manner to Zr(IV), a network modifier, but is markedly different from Ti(IV), a network former. In the most reduced glasses, highly ionic Sn(II...
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Journal Article
Journal: Elements
Published: 01 October 2017
Elements (2017) 13 (5): 325–330.
..., making it impossible to detect Hg(0) in mine waste using conventional XAFS methods. However, when Hg(0)-containing samples are cooled slowly to 77K, Hg(0) is converted to crystalline α-Hg whose XAFS spectrum is well defined and out-of-phase with the spectra of cinnabar and metacinnabar. Thus...
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Journal Article
Published: 01 October 2012
Geochemical Perspectives (2012) 1 (4-5): 603–610.
.... They also allow quantitative evaluation of the competition between NOM (or biofilms) and the mineral substrates they coat for metal ion binding. Figure 13.6 Pb L III -GI-XAFS spectra (and Fourier transforms) of a Pb 2+ - B. cepacia -α-Fe 2 O 3 (0001) sample at two different X-ray incidence angles...
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