scholarly journals Effects of crystallite size on the structure and magnetism of ferrihydrite

2016 ◽  
Vol 3 (1) ◽  
pp. 190-202 ◽  
Author(s):  
Xiaoming Wang ◽  
Mengqiang Zhu ◽  
Luuk K. Koopal ◽  
Wei Li ◽  
Wenqian Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Distribution Function ◽  
Crystallite Size ◽  
Absorption Spectroscopy ◽  
Pair Distribution Function ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

The structure and magnetic properties of nano-sized (1.6 to 4.4 nm) ferrihydrite samples are systematically investigated through a combination of X-ray diffraction (XRD), X-ray pair distribution function (PDF), X-ray absorption spectroscopy (XAS) and magnetic analyses.

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.

Study of Structural & Magnetic Properties of CoN Thin Films

2019 ◽  
Author(s):  
Mukul Gupta ◽  
Yogesh Kumar ◽  
Nidhi Pandey ◽  
Akhil Tayal ◽  
Wolfgang Caliebe ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Absorption Spectroscopy ◽  
Precise Determination ◽  
X Ray Diffraction ◽  
Magnetization Measurements ◽  
X Ray ◽  
X Ray Absorption ◽  
Theoretical Simulations

Precise determination of structure of CoN has been achieved combining x-ray diffraction, x-ray absorption spectroscopy measurements and theoretical simulations both at Co and N K-edges and magnetization measurements.<br>

Study of Structural & Magnetic Properties of CoN Thin Films

2019 ◽  
Author(s):  
Mukul Gupta ◽  
Yogesh Kumar ◽  
Nidhi Pandey ◽  
Akhil Tayal ◽  
Wolfgang Caliebe ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Absorption Spectroscopy ◽  
Precise Determination ◽  
X Ray Diffraction ◽  
Magnetization Measurements ◽  
X Ray ◽  
X Ray Absorption ◽  
Theoretical Simulations

Precise determination of structure of CoN has been achieved combining x-ray diffraction, x-ray absorption spectroscopy measurements and theoretical simulations both at Co and N K-edges and magnetization measurements.<br>

Doping effect on the local structure of metamagnetic Co doped Ni/NiO:GO core–shell nanoparticles using X-ray absorption spectroscopy and the pair distribution function

2019 ◽  
Vol 21 (3) ◽  
pp. 1294-1307 ◽  
Author(s):  
U. P. Gawai ◽  
D. K. Gaikwad ◽  
M. R. Bodke ◽  
H. A. Khawal ◽  
K. K. Pandey ◽  
...  
Keyword(s):  
Distribution Function ◽  
Absorption Spectroscopy ◽  
Local Structure ◽  
Pair Distribution Function ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
X Ray ◽  
Core Shell Nanoparticles ◽  
X Ray Absorption ◽  
Co Doped

Core–shell nanoparticles of Co doped Ni/NiO and incorporated GO sheets evidenced that the metamagnetic behavior at 5 K to 300 K temperatures.

scholarly journals Crystal Structure of Moganite and Its Anisotropic Atomic Displacement Parameters Determined by Synchrotron X-ray Diffraction and X-ray/Neutron Pair Distribution Function Analyses

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 272
Author(s):  
Seungyeol Lee ◽  
Huifang Xu ◽  
Hongwu Xu ◽  
Joerg Neuefeind
Keyword(s):  
Crystal Structure ◽  
Distribution Function ◽  
Single Crystal ◽  
Pair Distribution Function ◽  
Atomic Displacement ◽  
Single Crystal Xrd ◽  
X Ray Diffraction ◽  
X Ray ◽  
Neutron Pair ◽  
Atomic Displacement Parameters

The crystal structure of moganite from the Mogán formation on Gran Canaria has been re-investigated using high-resolution synchrotron X-ray diffraction (XRD) and X-ray/neutron pair distribution function (PDF) analyses. Our study for the first time reports the anisotropic atomic displacement parameters (ADPs) of a natural moganite. Rietveld analysis of synchrotron XRD data determined the crystal structure of moganite with the space group I2/a. The refined unit-cell parameters are a = 8.7363(8), b = 4.8688(5), c = 10.7203(9) Å, and β = 90.212(4)°. The ADPs of Si and O in moganite were obtained from X-ray and neutron PDF analyses. The shapes and orientations of the anisotropic ellipsoids determined from X-ray and neutron measurements are similar. The anisotropic ellipsoids for O extend along planes perpendicular to the Si-Si axis of corner-sharing SiO4 tetrahedra, suggesting precession-like movement. Neutron PDF result confirms the occurrence of OH over some of the tetrahedral sites. We postulate that moganite nanomineral is stable with respect to quartz in hypersaline water. The ADPs of moganite show a similar trend as those of quartz determined by single-crystal XRD. In short, the combined methods can provide high-quality structural parameters of moganite nanomineral, including its ADPs and extra OH position at the surface. This approach can be used as an alternative means for solving the structures of crystals that are not large enough for single-crystal XRD measurements, such as fine-grained and nanocrystalline minerals formed in various geological environments.

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