Structural and Electronic Properties of Sol−Gel Titanium Oxides Studied by X-ray Absorption Spectroscopy

1998 ◽  
Vol 102 (52) ◽  
pp. 10650-10657 ◽  
Author(s):  
Vittorio Luca ◽  
Samitha Djajanti ◽  
Russell F. Howe
Keyword(s):  
Electronic Properties ◽  
Absorption Spectroscopy ◽  
Sol Gel ◽  
Titanium Oxides ◽  
X Ray ◽  
Structural And Electronic Properties ◽  
X Ray Absorption

Effects of Lattice Defects on Cathode Properties of LiMn2O4 Synthesized at Low Temperatures for Lithium Ion Secondary Battery

2008 ◽  
Vol 388 ◽  
pp. 41-44 ◽  
Author(s):  
Hiroyuki Kaiya ◽  
Shinya Suzuki ◽  
Masaru Miyayama
Keyword(s):  
Absorption Spectroscopy ◽  
Low Temperatures ◽  
Heating Temperature ◽  
Sol Gel ◽  
Lithium Ion ◽  
Lattice Defects ◽  
X Ray ◽  
Secondary Battery ◽  
Cation Mixing ◽  
X Ray Absorption

Effects of lattice defects on cathode properties of LiMn2O4 synthesized at low temperatures were investigated. LiMn2O4 powders were synthesized by a sol-gel method. The specific capacities of LiMn2O4 decreased from 134 to 81 mAh g-1 with decreasing heating temperature from 750 to 200°C. X-ray absorption spectroscopy showed that a large amount of lattice defects such as cation vacancies existed and cation mixing occurred in LiMn2O4 calcined at low temperatures. It was found that the low specific capacities of LiMn2O4 calcined at low temperatures were attributed to these lattice defects.

Hydrogen as a Modifier of the Structure and Electronic Properties of Platinum in Acidic Zeolite LTL: A Combined Infrared and X-ray Absorption Spectroscopy Study

1995 ◽  
Vol 99 (43) ◽  
pp. 16067-16075 ◽  
Author(s):  
Marius Vaarkamp ◽  
Barbara L. Mojet ◽  
Menno J. Kappers ◽  
Jeff T. Miller ◽  
Diek C. Koningsberger
Keyword(s):  
Electronic Properties ◽  
Absorption Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray ◽  
X Ray Absorption

Superoxide dismutase, a study of the electronic properties of the copper and zinc by x-ray absorption spectroscopy

Biochemistry ◽  
1978 ◽  
Vol 17 (10) ◽  
pp. 1842-1846 ◽  
Author(s):  
W. E. Blumberg ◽  
J. Peisach ◽  
P. Eisenberger ◽  
J. A. Fee
Keyword(s):  
Superoxide Dismutase ◽  
Electronic Properties ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
Copper And Zinc ◽  
X Ray Absorption

X-ray Diffraction and X-ray Absorption Spectroscopy Studies of Sol−Gel-Processed Zirconium Titanates

2000 ◽  
Vol 12 (11) ◽  
pp. 3347-3355 ◽  
Author(s):  
J. Xu ◽  
C. Lind ◽  
A. P. Wilkinson ◽  
S. Pattanaik
Keyword(s):  
Absorption Spectroscopy ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Spectroscopy Studies ◽  
X Ray Absorption

X-ray absorption spectroscopy studies of local structure and electronic properties ofNaxSi136(0

2010 ◽  
Vol 82 (15) ◽  
Author(s):  
Andrew D. Ritchie ◽  
Mark A. MacDonald ◽  
Peng Zhang ◽  
Mary Anne White ◽  
Matt Beekman ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Absorption Spectroscopy ◽  
Local Structure ◽  
X Ray ◽  
X 24 ◽  
Spectroscopy Studies ◽  
X Ray Absorption

scholarly journals Local versus global electronic properties of chalcopyrite alloys: X-ray absorption spectroscopy and ab initio calculations

2014 ◽  
Vol 116 (9) ◽  
pp. 093703 ◽  
Author(s):  
Rafael Sarmiento-Pérez ◽  
Silvana Botti ◽  
Claudia S. Schnohr ◽  
Iver Lauermann ◽  
Angel Rubio ◽  
...  
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Electronic Properties ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Absorption

Properties of Pure and Sulfided NiMoO4 and CoMoO4 Catalysts: Tpr, Xanes and Time-Resolved XRD Studdzs

1997 ◽  
Vol 497 ◽  
Author(s):  
S. Chaturvedi ◽  
J. A. Rodriguez ◽  
J. C. Hanson ◽  
A. Albornoz ◽  
J. L. Brito
Keyword(s):  
Electronic Properties ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
Direct Transformation ◽  
X Ray ◽  
Β Phase ◽  
Structural And Electronic Properties ◽  
X Ray Absorption ◽  
Kinetics Of ◽  
Cobalt And Nickel

ABSTRACTX-ray absorption near-edge spectroscopy (XANES) was used to characterize the structural and electronic properties of a series of cobalt- and nickel-molybdate catalysts (AMoO4.nH20, α-AMoO4, β-AMoO4; A= Co or Ni). The results of XANES indicate that the Co and Ni atoms are in octahedral sites in all these compounds, while the coordination of Mo varies from octahedral in the a-phases to tetrahedral in the β-phases and hydrate. Time-resolved x-ray diffraction shows a direct transformation of the hydrates into the β-AMoO4 compounds (following a kinetics of first order) at temperatures between 200 and 350 °C. This is facilitated by the similarities that the AMoO4.nH20 and β-AMoO4 compounds have in their structural and electronic properties. The molybdates react with H 2 at temperatures between 400 and 600 °C, forming gaseous water and oxides in which the oxidation state of Co and Ni remains +2 while that of Mo is reduced to +5 or +4. After exposing α-NiMoO4 and P-NiMoO4 to H2S, both metals get sulfided and a NiMoSx phase is formed. For the β phase of NiMoO4 the sulfidation of Mo is more extensive than for the a phase, making the former a better precursor for catalysts of hydrodesulfurization reactions.

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