Quadrupolar transitions and medium-range-order effects in metalK-edge x-ray absorption spectra of3dtransition-metal compounds

2004 ◽  
Vol 70 (3) ◽  
Author(s):  
Z. Y. Wu ◽  
D. C. Xian ◽  
T. D. Hu ◽  
Y. N. Xie ◽  
Y. Tao ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Range Order ◽  
Order Effects ◽  
Metal Compounds ◽  
Medium Range Order ◽  
X Ray ◽  
Medium Range ◽  
X Ray Absorption

scholarly journals Temperature dependence of amorphous magnesium carbonate structure studied by PDF and XAFS analyses

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Gen-ichiro Yamamoto ◽  
Atsushi Kyono ◽  
Satoru Okada
Keyword(s):  
Temperature Dependence ◽  
Three Dimensional ◽  
Magnesium Carbonate ◽  
Range Order ◽  
Edge Structure ◽  
Medium Range Order ◽  
X Ray ◽  
Medium Range ◽  
Mineral Trapping ◽  
X Ray Absorption

AbstractMineral trapping through the precipitation of carbonate minerals is a potential approach to reduce CO2 accumulation in the atmosphere. The temperature dependence of amorphous magnesium carbonate (AMC), a precursor of crystalline magnesium carbonate hydrates, was investigated using synchrotron X-ray scattering experiments with atomic pair distribution function (PDF) and X-ray absorption fine structure analysis. PDF analysis revealed that there were no substantial structural differences among the AMC samples synthesized at 20, 60, and 80 °C. In addition, the medium-range order of all three AMC samples was very similar to that of hydromagnesite. Stirring in aqueous solution at room temperature caused the AMC sample to hydrate immediately and form a three-dimensional hydrogen-bonding network. Consequently, it crystallized with the long-range structural order of nesquehonite. The Mg K-edge X-ray absorption near-edge structure spectrum of AMC prepared at 20 °C was very similar to that of nesquehonite, implying that the electronic structure and coordination geometry of Mg atoms in AMC synthesized at 20 °C are highly similar to those in nesquehonite. Therefore, the short-range order (coordination environment) around the Mg atoms was slightly modified with temperature, but the medium-range order of AMC remained unchanged between 20 and 80 °C.

Medium-Range Order of Amorphous Silicon Germanium Alloys: Small-Angle X-Ray Scattering Study

1989 ◽  
Vol 28 (Part 2, No. 7) ◽  
pp. L1092-L1095 ◽  
Author(s):  
Shin-ichi Muramatsu ◽  
Toshikazu Shimada ◽  
Hiroshi Kajiyama ◽  
Kazufumi Azuma ◽  
Takeshi Watanabe ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
Small Angle ◽  
Silicon Germanium ◽  
Range Order ◽  
Medium Range Order ◽  
X Ray ◽  
X Ray Scattering ◽  
Medium Range ◽  
Scattering Study ◽  
Amorphous Silicon Germanium

scholarly journals Using coherent X-ray ptychography to probe medium-range order

2013 ◽  
Vol 21 (23) ◽  
pp. 28019 ◽  
Author(s):  
A. T. J. Torrance ◽  
B. Abbey ◽  
C. T. Putkunz ◽  
D. Pelliccia ◽  
E. Balaur ◽  
...  
Keyword(s):  
Range Order ◽  
Medium Range Order ◽  
X Ray ◽  
Medium Range
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