scattering study
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2022 ◽  
Author(s):  
Konstantinos Leonidas Stefanopoulos ◽  
Evangelos P. Favvas ◽  
Georgios N. Karanikolos ◽  
Waleed Alameri ◽  
Vassilios C Kelessidis ◽  
...  

The CO2 Enhanced Oil Recovery (CO2-EOR) process was monitored in real time at the nanoscale by neutron scattering. This was achieved by in situ injection of supercritical CO2 into a...


2021 ◽  
Vol 7 (1) ◽  
pp. 4
Author(s):  
Kosuke Suzuki ◽  
Yuji Otsuka ◽  
Kazushi Hoshi ◽  
Hiroshi Sakurai ◽  
Naruki Tsuji ◽  
...  

The redox process in a lithium-ion battery occurs when a conduction electron from the lithium anode is transferred to the redox orbital of the cathode. Understanding the nature of orbitals involved in anionic as well as cationic redox reactions is important for improving the capacity and energy density of Li-ion batteries. In this connection, we have obtained magnetic Compton profiles (MCPs) from the Li-rich cation-disordered rock-salt compound LixTi0.4Mn0.4O2 (LTMO). The MCPs, which involved the scattering of circularly polarized hard X-rays, are given by the momentum density of all the unpaired spins in the material. The net magnetic moment in the ground state can be extracted from the area under the MCP, along with a SQUID measurement. Our analysis gives insight into the role of Mn 3d magnetic electrons and O 2p holes in the magnetic redox properties of LTMO.


Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 79
Author(s):  
Sergey Vakhrushev ◽  
Alexey Filimonov ◽  
Konstantin Petroukhno ◽  
Andrey Rudskoy ◽  
Stanislav Udovenko ◽  
...  

The question of the microscopic origin of the M-superstructure and additional satellite peaks in the Zr-rich lead zirconate-titanate is discussed for nearly 50 years. Clear contradiction between the selection rules of the critical scattering and the superstructure was found preventing unambiguous attributing of the observed superstructure either to the rotation of the oxygen octahedra or to the antiparallel displacements of the lead cations. Detailed analysis of the satellite pattern explained it as the result of the incommensurate phase transition rather than antiphase domains. Critical dynamics is the key point for the formulated problems. Recently, the oxygen tilt soft mode in the PbZr0.976Ti0.024O3 (PZT2.4) was found. But this does not resolve the extinction rules contradiction. The results of the inelastic X-ray scattering study of the phonon spectra of PZT2.4 around M-point are reported. Strong coupling between the lead and oxygen modes resulting in mode anticrossing and creation of the wide flat part in the lowest phonon dispersion curves is identified. This flat part corresponds to the mixture of the displacements of the lead and oxygen ions and can be an explanation of the extinction rules contradiction. Moreover, a flat dispersion surface is a typical prerequisite for the incommensurate phase transition.


2021 ◽  
Vol 47 (12) ◽  
pp. 1011-1021
Author(s):  
A. Yu. Glamazda ◽  
V. P. Gnezdilov ◽  
P. Lemmens ◽  
G. A. Zvyagina ◽  
I. A. Gudim

Author(s):  
Erwin Lalik ◽  
Kacper Drużbicki ◽  
Gavin Irvine ◽  
Matthias Gutmann ◽  
Svemir Rudić ◽  
...  

2021 ◽  
Vol 104 (13) ◽  
Author(s):  
X. Y. Li ◽  
D. Reig-i-Plessis ◽  
P.-F. Liu ◽  
S. Wu ◽  
B.-T. Wang ◽  
...  

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