A new eight-cation inverse high entropy spinel with large configurational entropy in both tetrahedral and octahedral sites: Synthesis and cation distribution by X-ray absorption spectroscopy

2020 ◽  
Vol 188 ◽  
pp. 26-31
Author(s):  
Martina Fracchia ◽  
Maela Manzoli ◽  
Umberto Anselmi-Tamburini ◽  
Paolo Ghigna
Keyword(s):  
Absorption Spectroscopy ◽  
Cation Distribution ◽  
Configurational Entropy ◽  
X Ray ◽  
High Entropy ◽  
Octahedral Sites ◽  
X Ray Absorption

scholarly journals Investigation on cation distribution and luminescence in spinel phase γ-Ga3−δO4 : Sm nanostructures using X-ray absorption spectroscopy

RSC Advances ◽  
2017 ◽  
Vol 7 (83) ◽  
pp. 52543-52554 ◽  
Author(s):  
Aditya Sharma ◽  
Mayora Varshney ◽  
Hyun-Joon Shin ◽  
Keun Hwa Chae ◽  
Sung Ok Won
Keyword(s):  
Absorption Spectroscopy ◽  
Cation Distribution ◽  
Spinel Phase ◽  
Luminescence Properties ◽  
X Ray ◽  
Octahedral Sites ◽  
Spectroscopic Investigations ◽  
X Ray Absorption

In this study, spectroscopic investigations are employed to quantify the Ga distribution over the tetrahedral/octahedral sites and to assimilate the luminescence properties in the barely reported γ-Ga2.67O4 : Sm nanoparticles.

Cation distribution in Ni1−xZnxFe2O4 using X-ray absorption spectroscopy

2014 ◽  
Author(s):  
A. K. Yadav ◽  
J. Jadhav ◽  
S. Biswas ◽  
S. N. Jha ◽  
D. Bhattacharyya ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Cation Distribution ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Probing the variability in oxidation states of magnetite nanoparticles by single-particle spectroscopy

2018 ◽  
Vol 6 (4) ◽  
pp. 875-882 ◽  
Author(s):  
A. Fraile Rodríguez ◽  
C. Moya ◽  
M. Escoda-Torroella ◽  
A. Romero ◽  
A. Labarta ◽  
...  
Keyword(s):  
Oxidation State ◽  
Absorption Spectroscopy ◽  
Magnetite Nanoparticles ◽  
Single Particle ◽  
Cation Distribution ◽  
Oxidation States ◽  
Magnetic Response ◽  
X Ray ◽  
Single Particle Spectroscopy ◽  
X Ray Absorption

Single-particle X-ray absorption spectroscopy reveals that the oxidation state and cation distribution of individual magnetite nanoparticles may be largely heterogeneous even when the macroscopic structural and magnetic response of the ensembles is uniform.

scholarly journals Manganese incorporation in synthetic hercynite

2015 ◽  
Vol 79 (3) ◽  
pp. 635-647 ◽  
Author(s):  
G. D. Bromiley ◽  
G. D. Gatta ◽  
T. Stokes
Keyword(s):  
Single Crystal ◽  
Absorption Spectroscopy ◽  
Structure Refinement ◽  
Tetrahedral Site ◽  
Silicate Melt ◽  
X Ray ◽  
Octahedral Sites ◽  
Partial Disorder ◽  
X Ray Absorption ◽  
Preferential Incorporation

AbstractManganese incorporation in synthetic hercynite, and partitioning between hercynite and silicate melt synthesized at 1.0 GPa, 1250°C, and at an fO2 buffered by Fe–FeO, has been studied by X-ray absorption spectroscopy and single-crystal X-ray structure refinement. Spectra indicate the presence of both Mn2+ and Mn3+ (and possibly also Mn4+) in synthetic hercynite and partitioning of Mn2+ into the melt phase, and Mn3+ into hercynite, respectively, under run conditions. X-ray refinement is consistent with partial disorder of Fe and Al across tetrahedral and octahedral sites. A higher than expected degree of Fe-Al disorder in the Mn-bearing hercynite can be explained by preferential incorporation of Mn2+ onto the tetrahedral site, and indicates that Fe-Al disorder in pure, stoichiometric hercynite cannot necessarily be used to determine closure temperatures in natural spinel. However, partitioning of Mn2+ and Mn3+ between melt and hercynite suggests that Mn incorporation in hercynite could be used as a measure of fO2 conditions in magmas during spinel crystallization.

Structural and mechanistic insights into low-temperature CO oxidation over a prototypical high entropy oxide by Cu L-edge operando soft X-ray Absorption Spectroscopy

2021 ◽  
Author(s):  
Paola D'Angelo ◽  
Francesco TAVANI ◽  
Martina Fracchia ◽  
Alessandro Tofoni ◽  
Luca Braglia ◽  
...  
Keyword(s):  
Low Temperature ◽  
Co Oxidation ◽  
Absorption Spectroscopy ◽  
Special Interest ◽  
Multicomponent Systems ◽  
X Ray ◽  
High Entropy ◽  
Low Temperature Co Oxidation ◽  
X Ray Absorption

High entropy oxides (HEOs) are an emerging class of materials constituted by multicomponent systems that are receiving special interest as candidates for obtaining novel and desirable properties. In this study...

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