Structure of potassium germanophosphate glasses by X-ray and neutron diffraction: 2. Medium-range order

2008 ◽  
Vol 354 (29) ◽  
pp. 3400-3407 ◽  
Author(s):  
U. Hoppe ◽  
G. Walter ◽  
R.K. Brow ◽  
N.P. Wyckoff
1989 ◽  
Vol 28 (Part 2, No. 7) ◽  
pp. L1092-L1095 ◽  
Author(s):  
Shin-ichi Muramatsu ◽  
Toshikazu Shimada ◽  
Hiroshi Kajiyama ◽  
Kazufumi Azuma ◽  
Takeshi Watanabe ◽  
...  

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Gen-ichiro Yamamoto ◽  
Atsushi Kyono ◽  
Satoru Okada

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.


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

RSC Advances ◽  
2015 ◽  
Vol 5 (63) ◽  
pp. 50938-50941 ◽  
Author(s):  
Marco Campetella ◽  
Serena De Santis ◽  
Ruggero Caminiti ◽  
Paolo Ballirano ◽  
Claudia Sadun ◽  
...  

The pre-peak in the X-ray scattering patterns of ionic liquids is not always due to alkyl chains. In choline–proline (a bio-compatible ionic liquid), it is due to second-shell cation–cation distances.


2011 ◽  
Vol 13 (44) ◽  
pp. 19997 ◽  
Author(s):  
Congcong Huang ◽  
K. T. Wikfeldt ◽  
D. Nordlund ◽  
U. Bergmann ◽  
T. McQueen ◽  
...  

2006 ◽  
Vol 960 ◽  
Author(s):  
Lixin Fan ◽  
David Paterson ◽  
Ian McNulty ◽  
M. M. J. Treacy ◽  
Dushyant Kumar ◽  
...  

ABSTRACTThe control of formation and ordering of self assembled nanostructures, with medium- to long-range order, is a challenge that limits advances in many fields of nanotechnology. We have developed a technique, which we call fluctuation x-ray microscopy, that offers quantitative insight into medium-range correlations in disordered materials at nanometer- and larger-length scales. We examined the influence of sol-gel process variables on medium range order in PI-b-PEO/ aluminosilicate bulk using this technique. The nano-structuring of inorganic materials was directed by polymer self-assembly. The medium range correlation between the nanostructures in two hybrids was quantitatively examined and compared.


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