scholarly journals What happens structurally and chemically during sodium uptake and release by Ni2P2S6: a combined X-ray diffraction, X-ray absorption, pair distribution function and MAS NMR analysis

2020 ◽  
Vol 8 (42) ◽  
pp. 22401-22415
Author(s):  
Jonas van Dinter ◽  
Kevin Synnatschke ◽  
Tobias A. Engesser ◽  
Sylvio Indris ◽  
Niklas Wolff ◽  
...  
Keyword(s):  
Pair Distribution Function ◽  
Sodium Ion ◽  
Layered Compound ◽  
Sodium Ion Batteries ◽  
X Ray Diffraction ◽  
X Ray ◽  
Multi Method Approach ◽  
X Ray Absorption ◽  
Method Approach ◽  
Uptake And Release

The layered compound Ni2P2S6 was electrochemically characterized for application as an anode material in sodium-ion batteries (SIBs) and the corresponding reaction mechanism was investigated via a multi-method approach.

Temperature-dependent synchrotron X-ray diffraction, pair distribution function and susceptibility study on the layered compound CrTe3

2018 ◽  
Vol 233 (6) ◽  
pp. 361-370 ◽  
Author(s):  
Anna-Lena Hansen ◽  
Bastian Dietl ◽  
Martin Etter ◽  
Reinhard K. Kremer ◽  
David C. Johnson ◽  
...  
Keyword(s):  
Distribution Function ◽  
Pair Distribution Function ◽  
Exchange Interactions ◽  
Structural Distortion ◽  
Layered Compound ◽  
Minor Amount ◽  
Zero Field ◽  
X Ray Diffraction ◽  
X Ray ◽  
Anisotropic Expansion

Abstract Results of combined synchrotron X-ray diffraction and pair distribution function experiments performed on the layered compound CrTe3 provide evidence for a short range structural distortion of one of the two crystallographically independent CrTe6 octahedra. The distortion is caused by higher mobility of one crystallographically distinct Te ion, leading to an unusual large Debye Waller factor. In situ high temperature X-ray diffraction investigations show an initial crystallization of a minor amount of elemental Te followed by decomposition of CrTe3 into Cr5Te8 and Te. Additional experiments provide evidence that the Te impurity (<1%) cannot be avoided. Analyses of structural changes in the temperature range 100–754 K show a pronounced anisotropic expansion of the lattice parameters. The differing behavior of the crystal axes is explained on the basis of structural distortions of the Cr4Te16 structural building units. An abrupt distortion of the structure occurs at T≈250 K, which then remains nearly constant down to 100 K. The structural distortion affects the spin exchange interactions between Cr3+ cations. A significant splitting between field-cooled (fc) and zero-field-cooled (zfc) magnetic susceptibility is observed below about 200 K. Applying a small external magnetic field results in a substantial spontaneous magnetization, reminiscent of ferro- or ferrimagnet exchange interactions below ~240 K. A Debye temperature of ~150 K was extracted from heat capacity measurements.

scholarly journals Hard X-ray-based techniques for structural investigations of CO2 methanation catalysts prepared by MOF decomposition

Nanoscale ◽  
2020 ◽  
Vol 12 (29) ◽  
pp. 15800-15813
Author(s):  
Nils Prinz ◽  
Leif Schwensow ◽  
Sven Wendholt ◽  
Andreas Jentys ◽  
Matthias Bauer ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Pair Distribution Function ◽  
Metal Organic Framework ◽  
X Ray Diffraction ◽  
Co2 Methanation ◽  
Structural Investigations ◽  
X Ray ◽  
Structure Activity ◽  
Metal Organic ◽  
X Ray Absorption

We investigate the structure-activity correlations of methanation catalysts obtained by thermal decomposition of a Ni-based metal-organic framework, using pair distribution function, X-ray absorption spectroscopy and X-ray diffraction.

scholarly journals X-ray spectroscopic and scattering methods applied to the characterisation of cobalt-based Fischer–Tropsch synthesis catalysts

2016 ◽  
Vol 6 (15) ◽  
pp. 5773-5791 ◽  
Author(s):  
Jennifer J. Herbert ◽  
Pierre Senecal ◽  
David J. Martin ◽  
Wim Bras ◽  
Simon K. Beaumont ◽  
...  
Keyword(s):  
Distribution Function ◽  
Absorption Spectroscopy ◽  
Pair Distribution Function ◽  
Tropsch Synthesis ◽  
X Ray Diffraction ◽  
Fischer Tropsch ◽  
X Ray ◽  
Synthesis Catalysts ◽  
Fisher Tropsch Synthesis ◽  
X Ray Absorption

This review aims to critically assess the use of X-ray techniques, both of a scattering (e.g. X-ray diffraction (XRD), pair distribution function (PDF)) and spectroscopic nature (X-ray absorption spectroscopy (XAFS)), in the study of cobalt-based Fisher–Tropsch synthesis (FTS) catalysts.

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