Time dependence of the chemical composition of the surface film on the metastable tin–nickel alloy studied with x‐ray photoelectron spectroscopy

1978 ◽  
Vol 15 (1) ◽  
pp. 20-23 ◽  
Author(s):  
H. G. Tompkins ◽  
G. K. Wertheim ◽  
S. P. Sharma
Keyword(s):  
Chemical Composition ◽  
Time Dependence ◽  
Nickel Alloy ◽  
Photoelectron Spectroscopy ◽  
Surface Film ◽  
X Ray

scholarly journals Depth Profiling of the Chemical Composition of Free-Standing Carbon Dots Using X-ray Photoelectron Spectroscopy

2018 ◽  
Vol 122 (26) ◽  
pp. 14889-14897 ◽  
Author(s):  
Irene Papagiannouli ◽  
Minna Patanen ◽  
Valérie Blanchet ◽  
John D. Bozek ◽  
Manuel de Anda Villa ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Photoelectron Spectroscopy ◽  
Carbon Dots ◽  
Depth Profiling ◽  
Free Standing ◽  
X Ray

Influence of nitrite on chemical composition of passivation film of steel bars under the coupling effects of carbonization and chloride

2019 ◽  
Vol 66 (2) ◽  
pp. 230-235 ◽  
Author(s):  
Junzhe Liu ◽  
Jundi Geng ◽  
Hui Wang ◽  
Mingfang Ba ◽  
Zhiming He
Keyword(s):  
Chemical Composition ◽  
Photoelectron Spectroscopy ◽  
Chloride Solution ◽  
Layer Structure ◽  
Coupling Effects ◽  
Content Type ◽  
X Ray ◽  
Passivation Film ◽  
Steel Bars ◽  
Micro Structures

Purpose This paper aims to study the influence of NaNO2 on the chemical composition of passivation film. Design/methodology/approach X-ray photoelectron spectroscopy and X-ray diffraction were selected to determine the composition of passivation film of steel bars in mortar. The specimens were exposed to the chloride solution, carbonation environment and the coupling effects of chloride solution and carbonation. The chemical composition and micro structures at 0 and 5 nm from the outer surface of the passivation film of steel bars were analyzed. Findings Results showed that the nitrite inhibitor improved the forming rate of the passivation film and increased the mass ratio of Fe3O4 to FeOOH on the surface of steel bars. The component of Fe3O4 at 5 nm of the steel passivation film was more than that at 0 nm. Sodium ferrite in the pore solution was easily hydrolyzed and then FeOOH was formed. Therefore, due to the nitrite inhibitor, a “double layer structure” of the passivation film was formed to prevent steels bars from corrosion. Originality/value This is original work and may help the researchers further understand the mechanism of rust resistance by nitrite inhibitor.

Electrochemical and Spectroscopie Evaluation of Lithium Intercalation in Tailored Polymethacrylonitrile Carbons

1997 ◽  
Vol 496 ◽  
Author(s):  
Kevin R. Zavadil ◽  
Ronald A. Guidotti ◽  
William R. Even
Keyword(s):  
Photoelectron Spectroscopy ◽  
Bound States ◽  
Secondary Ion Mass Spectrometry ◽  
Surface Film ◽  
Lithium Ion ◽  
Irreversible Loss ◽  
X Ray ◽  
The Third ◽  
Secondary Ion ◽  
Voltammetric Measurements

AbstractDisordered polymethacrylonitrile (PMAN) carbon monoliths have been studied as potential tailored electrodes for lithium ion batteries. A combination of electrochemical and surface spectroscopie probes have been used to investigate irreversible loss mechanisms. Voltammetric measurements show that Li intercalates readily into the carbon at potentials IV positive of the reversible Li potential. The coulometric efficiency rises rapidly from 50% for the first potential cycle to greater than 85% for the third cycle, indicating that solvent decomposition is a self-limiting process. Surface film composition and thickness, as measured by x-ray photoelectron spectroscopy (XPS) and secondary ion mass spectrometry (SIMS), does not vary substantially when compared to more ordered carbon surfaces. Li+ profiles are particularly useful in discriminating between the bound states of Li at the surface of solution permeable PMAN carbons.

X-ray Photoelectron Spectroscopy Investigation of Corrosion Behavior of ASTM C71640 Copper-Nickel Alloy in Seawater

CORROSION ◽  
1992 ◽  
Vol 48 (5) ◽  
pp. 404-410 ◽  
Author(s):  
R. Zanoni ◽  
G. Gusmano ◽  
G. Montesperelli ◽  
E. Traversa
Keyword(s):  
Nickel Alloy ◽  
Corrosion Behavior ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Copper Nickel ◽  
Copper Nickel Alloy

X-ray Photoelectron Spectroscopy (XPS) Investigation of the Surface Film on Magnesium Powders

2012 ◽  
Vol 66 (5) ◽  
pp. 510-518 ◽  
Author(s):  
Paul J. Burke ◽  
Zeynel Bayindir ◽  
Georges J. Kipouros
Keyword(s):  
Surface Layer ◽  
Photoelectron Spectroscopy ◽  
Focused Ion Beam ◽  
Surface Film ◽  
Ion Beam ◽  
Pure Magnesium ◽  
Atmospheric Conditions ◽  
Magnesium Powder ◽  
X Ray ◽  
Aerospace Applications

Magnesium (Mg) and its alloys are attractive for use in automotive and aerospace applications because of their low density and good mechanical properties. However, difficulty in forming magnesium and the limited number of available commercial alloys limit their use. Powder metallurgy may be a suitable solution for forming near-net-shape parts. However, sintering pure magnesium presents difficulties due to surface film that forms on the magnesium powder particles. The present work investigates the composition of the surface film that forms on the surface of pure magnesium powders exposed to atmospheric conditions and on pure magnesium powders after compaction under uniaxial pressing at a pressure of 500 MPa and sintering under argon at 600 °C for 40 minutes. Initially, focused ion beam microscopy was utilized to determine the thickness of the surface layer of the magnesium powder and found it to be ∼10 nm. The X-ray photoelectron analysis of the green magnesium sample prior to sintering confirmed the presence of MgO, MgCO3·3H2O, and Mg(OH)2 in the surface layer of the powder with a core of pure magnesium. The outer portion of the surface layer was found to contain MgCO3·3H2O and Mg(OH)2, while the inner portion of the layer is primarily MgO. After sintering, the MgCO3·3H2O was found to be almost completely absent, and the amount of Mg(OH)2 was also decreased significantly. This is postulated to occur by decomposition of the compounds to MgO and gases during the high temperature of sintering. An increase in the MgO content after sintering supports this theory.

CHEMICAL COMPOSITION AND CRYSTALLINE PHASES IN F-DOPED TIN OXIDE FILMS GROWN BY DC REACTIVE SPUTTERING

2001 ◽  
Vol 15 (17n19) ◽  
pp. 634-638 ◽  
Author(s):  
A. MARTEL ◽  
F. CABALLERO-BRIONES ◽  
A. IRIBARREN ◽  
R. CASTRO-RODRÍGUEZ ◽  
P. BARTOLO-PÉREZ ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Tin Oxide ◽  
Photoelectron Spectroscopy ◽  
Molar Fraction ◽  
Reactive Sputtering ◽  
Simultaneous Presence ◽  
X Ray Diffraction ◽  
Structural Variations ◽  
X Ray ◽  
Tin Oxide Films

We study by x-ray diffraction (XRD) the structural variations on a series of SnOx:F films grown by dc reactive sputtering from a metallic tin target in an Ar- O 2-Freon plasma. We found that the films tend to be crystalline when the stoichiometry approaches to that of SnO or SnO 2, being amorphous in between. We fitted the x-ray diffractograms and found that films are composed by a mixture of compounds, i.e. SnO, Sn 3 O 4, Sn 2 O 3 and SnO 2, given by the simultaneous presence of Sn +2 and Sn +4. From the analysis of the deconvoluted areas under the x-ray diffractograms we calculate the Sn +2/ Sn and Sn +4/ Sn molar fraction present in the films. The same calculations are done for the x-ray photoelectron spectroscopy (XPS) results. By applying a combinatory model we fitted the general behavior of SnO x films with different oxygen content versus the Sn +2/ Sn and Sn +4/ Sn molar fraction. Both XRD and XPS results are compared with the theoretical curve, showing a well agreement.

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