Quantitative analysis of Auger lineshapes of oxidized iron

Sault, Allen G.

doi:10.1016/0169-4332(94)90006-x

Cited by 51 publications

(37 citation statements)

References 28 publications

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“…After correcting the spectra for charge effects using the 285 eV C1s peak, 16 the Fe2p and Co2p XPS spectra were described using individual Gaussian-Lorentzians with constrained widths and shapes, and an iterated Shirley background function. 17 Metallic Fe and Co 2p 3/2 peaks 18,19 (see figure 1 b-d) centered at ~ 707 eV and 778 eV, respectively, were observed for all three systems (see Supporting Information Table 1 for a complete listing of the binding energies obtained from the deconvolution of the Fe and Co spectra). Peaks at higher binding energies resulting from the 2+ and 3+ oxidation states of Fe and Co were observed, indicating the presence of both Fe and Co silicates.…”

Section: Resultsmentioning

confidence: 95%

Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO₂ Core/Shell Nanoparticles

Desautels

Rowe²,

Jones³

et al. 2015

Langmuir

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The integration of superparamagnetic core/shell nanoparticles into devices and other nanoscale technological applications requires a detailed understanding of how the intimate contact between core and shell nanophases affects the magnetism. We report how, for single-domain FeCo nanoparticles, an FeCo phase unique to the nanoscale with silica shells of increasing thicknesses spontaneously formed interfacial metal silicates between the core and shell (such as Fe2SiO4 and Co2SiO4) and altered the overall magnetism of the nanomaterial significantly. The influence of this previously overlooked phenomenon on magnetic properties is reported. Evidence of these metal silicate interfacial layers was observed by X-ray absorption spectroscopy (XAS) collected over the L3,2 absorption edges of Fe and X-ray photoelectron spectra (XPS) collected over the 2p transitions of Fe and Co. Through the correlation of magnetometry and XPS data, the evolution of nanoparticle magnetic anisotropy is shown to increase with the metal silicate.

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Section: Resultsmentioning

confidence: 95%

Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO₂ Core/Shell Nanoparticles

Desautels

Rowe²,

Jones³

et al. 2015

Langmuir

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“…These low-energy peaks, corresponding to Fe(MNN) Auger transitions, are especially useful since their line shape has proven to be extremely sensitive to the chemical environment, in particular to Fe oxidation. 56 Comparison of the Auger spectra acquired on oxygen-free and oxidized Fe reveals that on the oxidized sample a shoulder appears at lower kinetic energy with respect to the main peak located at 47 eV, the latter being characteristic of oxygen-free Fe. This feature is more evident for Auger spectra performed at grazing incidence and can be considered as a fingerprint of the presence of O-Fe bonds in the topmost layer of the Fe(001)-p(1 × 1)O surface.…”

Section: Resultsmentioning

confidence: 99%

Self-organized chromium oxide monolayers on Fe(001)

et al. 2013

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The oxygen-saturated Fe(001)-p(1 × 1)O surface has been used as a template to stabilize two-dimensional Cr oxides on Fe(001). Cr deposition at 400 • C leads to two different well-ordered phases, depending on the amount of Cr deposited. In the submonolayer regime a novel c(4 × 2) overlayer self-assembles on the Fe(001)-p(1 × 1)O surface, saturating for a coverage of about 0.75 monolayers. This phase becomes unstable for higher coverages, when a ( √ 5 × √ 5)R27 • superstructure emerges. The structural and electronic details of the two one-layer-thick oxides are studied by combining high-resolution scanning tunneling microscopy, low-energy electron diffraction, Auger electron spectroscopy, and density functional theory.

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“…The ratio of Li−N−N−Li peak, located at ∼54.35 eV, in LCO/ADL full‐cell was higher than the LFP/ADL full‐cell, which can be attributed to the higher specific capacity of LCO/ADL full‐cell. In addition, the obvious peak at ∼55.20 eV corresponded to the deposition of Li metal on the surface of the ADL electrode during charging in LCO/ADL full‐cells. One should be noted that inert materials (such as Co 3 O 4 ) are probably formed on the surface of the cathode due to over‐extraction of Li from LCO, which is the main reason for irreversible capacity loss of LCO/ADL full cells.…”

Section: Resultsmentioning

confidence: 99%

Azo‐Group‐Containing Organic Compounds as Electrode Materials in Full‐Cell Lithium‐Ion Batteries

et al. 2019

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Inorganic compounds, including graphite, transition metal oxides, and chalcogenides, are widely used as electrode materials in rechargeable lithium-ion batteries (LIBs). However, environmentally friendly and cost-effective alternatives are pursued by focusing on the molecular design of organic materials that could be potential electrode materials in nextgeneration LIBs. Herein, we study the utilization of an organic compound, azobenzene 4,4-dicarboxylate lithium (ADL), as a negative electrode in full-cell LIBs. The full-cell LIBs are assembled by using ADL as the negative electrode, LiCoO 2 (LCO/ADL) or LiFePO 4 (LFP/ADL) as the positive electrode, and 1 M LiPF 6 dissolved in ethylene carbonate/diethylene carbonate (EC : DEC = 1 : 1 by volume) as the electrolyte. Then, ex situ X-ray diffraction (XRD), ex situ X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) were carried out to understand the charge storage mechanism and structural changes during the electrochemical reaction. From the charge/ discharge measurements, LFP/ADL rendered a higher specific capacity retention (88.05 %) than LCO/ADL full-cells (73.79 %) after 200 cycles at a current density of 100 mA g À 1 . The XPS analysis revealed that the deposition of metallic Li on the ADL anode in LCO/ADL full-cells led to rapid capacity decay and inferior cyclic performance, whereas Li-free metal deposition had been observed on the ADL anode in LFP/ADL full cells, which explained the higher cyclic stability and capacity retention rate in LFP/ADL full-cells. The present study provides useful insights into the development and practical utilization of organic electrodes in next-generation Li-ion battery technology.

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Quantitative analysis of Auger lineshapes of oxidized iron

Cited by 51 publications

References 28 publications

Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO₂ Core/Shell Nanoparticles

Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO₂ Core/Shell Nanoparticles

Self-organized chromium oxide monolayers on Fe(001)

Azo‐Group‐Containing Organic Compounds as Electrode Materials in Full‐Cell Lithium‐Ion Batteries

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Quantitative analysis of Auger lineshapes of oxidized iron

Cited by 51 publications

References 28 publications

Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO2 Core/Shell Nanoparticles

Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO2 Core/Shell Nanoparticles

Self-organized chromium oxide monolayers on Fe(001)

Azo‐Group‐Containing Organic Compounds as Electrode Materials in Full‐Cell Lithium‐Ion Batteries

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Product

Resources

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Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO₂ Core/Shell Nanoparticles

Spontaneously Formed Interfacial Metal Silicates and Their Effect on the Magnetism of Superparamagnetic FeCo/SiO₂ Core/Shell Nanoparticles