scholarly journals X-ray photoelectron spectroscopy, x-ray absorption spectroscopy, and x-ray diffraction characterization of CuO–TiO2–CeO2 catalyst system

2001 ◽  
Vol 19 (4) ◽  
pp. 1150-1157 ◽  
Author(s):  
M. S. P. Francisco ◽  
P. A. P. Nascente ◽  
V. R. Mastelaro ◽  
A. O. Florentino
Keyword(s):  
Absorption Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Catalyst System ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

On X-Ray Diffraction and X-Ray Absorption Spectroscopy Characterization of Ball Milled Iron Copper Solid Solution

1998 ◽  
Vol 269-272 ◽  
pp. 473-478 ◽  
Author(s):  
Francsco Cardellini ◽  
Vittoria Contini ◽  
Gregorio D'Agostino ◽  
Adriano Filipponi
Keyword(s):  
Solid Solution ◽  
Absorption Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Copper ◽  
X Ray Absorption

A characterization of titanium anodic oxides by X-ray absorption spectroscopy and grazing X-ray diffraction

1995 ◽  
Vol 388 (1-2) ◽  
pp. 115-122 ◽  
Author(s):  
Carlos da Fonseca ◽  
Agnès Traverse ◽  
Abderrahmane Tadjeddine ◽  
Manuel da Cunha Belo
Keyword(s):  
Absorption Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

scholarly journals A multi-method characterization of natural terrestrial birnessites

2020 ◽  
Vol 105 (6) ◽  
pp. 833-847
Author(s):  
Florence T. Ling ◽  
Jeffrey E. Post ◽  
Peter J. Heaney ◽  
Cara M. Santelli ◽  
Eugene S. Ilton ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Large Set ◽  
X Ray Diffraction ◽  
Full Spectrum ◽  
X Ray ◽  
High Concentrations ◽  
Diffraction Patterns ◽  
X Ray Absorption ◽  
Crystal Structure And Chemistry

Abstract With a focus on a large set of natural birnessites collected from terrestrial, freshwater systems, we applied and compared the capabilities of X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), Fourier-transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) to characterize crystal structure and chemistry. Using XRD, we successfully identified 3 of the 11 natural birnessite samples as hexagonal ranciéite-like phases, but the remaining samples yielded less interpretable “3-line” diffraction patterns with broad, asymmetrical peaks at d-spacings of ~7.2, ~2.4, and ~1.4 Å. EXAFS analysis suggested that many of these samples had characteristics of both triclinic and hexagonal birnessite. However, application of EXAFS to the ranciéite-like phases yielded unreasonably high concentrations of triclinic birnessite as an intergrowth, calling into question the use of synthetic hexagonal H-birnessite as an appropriate standard in the linear combination fitting of EXAFS data for natural birnessites. FTIR spectroscopy of the “3-line” birnessite samples successfully distinguished triclinic and hexagonal constituents, and analyses of peak positions suggested that natural birnessites occur as a full spectrum of triclinic and hexagonal intergrowths. XPS analysis of these samples revealed that higher Mn3+ concentrations relative to Mn2+ and Mn4+ are correlated to increased proportions of triclinic birnessite.

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