Evidence for a Universal Relationship Between Magnetization and Changes in the Local Structure

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3726-3728 ◽  
Author(s):  
L. Downward ◽  
F. Bridges ◽  
D. Cao ◽  
J. Neumeier ◽  
L. Zhou
Keyword(s):  
Magnetic Field ◽  
Distribution Function ◽  
Local Structure ◽  
Pair Distribution Function ◽  
Colossal Magnetoresistance ◽  
X Ray ◽  
Polaron State ◽  
Universal Relationship ◽  
High Fields ◽  
X Ray Absorption

X-ray Absorption Fine Structure (XAFS) measurements of the colossal magnetoresistance (CMR) sample La 0.79 Ca 0.21 MnO 3 at high fields indicate a decrease in the width parameter of the pair distribution function, σ, as the applied magnetic field is increased for T near Tc. The change in σ2 from the disordered polaron state varies approximately exponentially with magnetization irrespective of whether the sample magnetization was achieved through a change in temperature or the application of an external magnetic field. This suggests a more universal relationship between local structure and the sample magnetization than was previously indicated.

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 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.

scholarly journals UNIVERSAL RELATIONSHIP BETWEEN MAGNETIZATION AND CHANGES IN THE LOCAL STRUCTURE IN QUASICUBIC AND BILAYER MANGANITES

2005 ◽  
Vol 19 (01n03) ◽  
pp. 529-532
Author(s):  
FRANK BRIDGES ◽  
LISA DOWNWARD ◽  
J. J. NEUMEIER ◽  
J. MITCHELL ◽  
HONG ZHENG
Keyword(s):  
Magnetic Field ◽  
Local Structure ◽  
Pair Distribution Function ◽  
Magnetization Process ◽  
Local Distortion ◽  
Universal Relationship ◽  
Polaron Formation ◽  
Significant Change ◽  
The Relationship ◽  
Local Distortions

We extend our previous EXAFS investigations on the relationship between magnetization and local distortions to the bilayer materials La 2-2x Sr 1+2x Mn 2 O 7 and to higher magnetic fields, for quasicubic La 0.7 Ca 0.3 MnO 3. For each, there is a significant change in the broadening parameter σ of the Mn-O pair distribution function (PDF) associated with polaron formation as T is increased through T c. Applying a magnetic field reduces the local distortion of the Ca sample for temperatures near T c. For samples with sharp transitions, there is still a significant change of σ2 with T below T c when the sample is fully magnetized, i.e. distortions are still present and continuing to be removed as T is lowered well below T c. A simple model is presented for the magnetization process.

scholarly journals Synthesis, local structure and optical property studies of α-SnS microrods by synchrotron X-ray pair distribution function and micro-Raman shift

RSC Advances ◽  
2020 ◽  
Vol 10 (36) ◽  
pp. 21277-21282
Author(s):  
U. P. Gawai ◽  
D. K. Gaikwad ◽  
S. L. Patil ◽  
K. K. Pandey ◽  
N. P. Lalla ◽  
...  
Keyword(s):  
Distribution Function ◽  
Optical Property ◽  
Local Structure ◽  
Pair Distribution Function ◽  
Layer Structure ◽  
Raman Shift ◽  
X Ray ◽  
Bond Lengths

The PDF refinement shows layer structure of SnS-A with two distinct bond lengths, one nearly parallel to the ‘a’ axis and another perpendicular to the ‘a’ axis, it corresponds to bond lengths of 2.62528 (38) Å and 2.66204 (03) Å.

Sign in / Sign up

Export Citation Format

Share Document