An XPS study of iron sodium silicate glass surfaces

Mekki, A.; Holland, Diane; McConville, Christopher F; Salim, M.A.

doi:10.1016/s0022-3093(96)00523-6

Cited by 184 publications

(122 citation statements)

References 11 publications

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“…The SiO2 peak is shifted to low energy when glass consisting of a mixture of SiO2 and Na2O is measured by XPS, and the energy of the SiO2 peak is 0.8 eV lower than that of the SiO2 crystal when the proportions of SiO2 and Na2O are 69 and 31%, respectively. 19 The position of the peak shown by the blue line in Fig. 3a was in a good agreement with the XPS peak for a mixture of SiO2 and Na2O.…”

Section: Xps Observation Of Ablated Particles Merged With Ultrapure Wsupporting

confidence: 72%

Acceleration of Vaporization, Atomization, and Ionization Efficiencies in Inductively Coupled Plasma by Merging Laser-Ablated Particles with Hydrochloric Acid Gas

2016

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To accelerate the vaporization, atomization, and ionization efficiencies in laser ablation inductively coupled plasma mass spectrometry, we merged HCl gas with laser-ablated particles before introduction into the plasma, to convert their surface constituents from oxides to lower-melting chlorides. When particles were merged with HCl gas generated from a HCl solution at 200 C, the measured concentrations of elements in the particles were 135% higher on average than the concentrations in particles merged with ultrapure water vapor. Particle corrosion and surface roughness were observed by scanning electron microscopy, and oxide conversion to chlorides was confirmed by X-ray photoelectron spectroscopy. Under the optimum conditions, the recoveries of measured elements improved by 23% on average, and the recoveries of elements with high-melting oxides (Sr, Zr, and Th) improved by as much as 36%. These results indicate that vaporization, atomization, and ionization in the ICP improved when HCl gas was merged with the ablated particles.

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Section: Xps Observation Of Ablated Particles Merged With Ultrapure Wsupporting

confidence: 72%

Acceleration of Vaporization, Atomization, and Ionization Efficiencies in Inductively Coupled Plasma by Merging Laser-Ablated Particles with Hydrochloric Acid Gas

2016

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“…Satellite structures associated with the 2p core level peaks of transition metals which have been introduced into oxide glasses have been observed and used qualitatively to identify the oxidation state of the TM ion [11]. More recently, XPS has successfully determined the content of different oxidation states of transition metals in oxide glasses, such as iron, vanadium and copper in sodium silicate, phosphate and borate glasses [12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Structure and magnetic properties of vanadium–sodium silicate glasses

Mekki

Khattak

Holland

et al. 2003

Journal of Non-Crystalline Solids

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Vanadium-sodium silicate glasses with the chemical composition [ðV 2 O 5 Þ x (Na 2 O) 0:30 ðSiO 2 Þ 0:70Àx ] ð0:0 6 x 6 0:10Þ have been studied by X-ray photoelectron spectroscopy (XPS) and magnetization measurements. The core-level binding energies of O 1s, V 2p and Si 2p in these glasses have been measured for surfaces produced by in vacuo fracture. The peak position and width of the V 2p 3=2 peak are independent of the V 2 O 5 content while the O 1s core-level spectra show significant composition-dependent changes. Two distinct peaks are resolvable arising from the bridging oxygen and non-bridging oxygen (NBO) atoms in the silicate glasses. The fraction of NBO, determined from these spectra is found to increase with increasing V 2 O 5 content in the glass and are consistent with the formation of predominantly alkali metavanadate species. The magnetic susceptibility data of these glasses indicate a large, temperature-independent diamagnetic contribution arising from the glass matrix as well as small paramagnetic contribution from the V 4þ ions. The V 4þ content deduced from the magnetization results ($2%) is below the detection limit of XPS analysis.

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“…It has been shown in previous studies [1,[9][10][11][12][13][14][15] that the peak positions of Fe 2p 1/2 and Fe 2p 3/2 depend on the ionic states of Fe. The positions of the satellite peaks for the Fe 2p 1/2 and Fe 2p 3/2 peaks are also very sensitive to the oxidation states and these peaks have been used for qualitatively determining the ionic states of iron.…”

Section: Introductionmentioning

confidence: 86%

Natural Oxidation of thin Fe Films on V Buffer Layer

et al. 2017

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We have studied oxidation kinetics of Fe thin film under atmospheric conditions using the fact that metallic iron is a ferromagnet but ultrathin natural iron oxides are approximately nonmagnetic at room temperature. As a consequence, oxidation is associated with a loss in total Fe magnetic moment. Results show that the sample with an initial Fe thickness equal to 10 nm oxidize relatively fast (time constant τ = 0.05 day), whereby a constant amount of 2.5 nm of metal is transformed into oxides. For lower iron initial thickness (di = 4 nm) the time constant for oxidation significantly increases reaching a value of 2 days. Furthermore, X-ray photoelectron spectroscopy studies performed after 144 days of oxidation revealed formation of hematite (α-Fe2O3) thin film on the metallic rest of iron.

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An XPS study of iron sodium silicate glass surfaces

Cited by 184 publications

References 11 publications

Acceleration of Vaporization, Atomization, and Ionization Efficiencies in Inductively Coupled Plasma by Merging Laser-Ablated Particles with Hydrochloric Acid Gas

Acceleration of Vaporization, Atomization, and Ionization Efficiencies in Inductively Coupled Plasma by Merging Laser-Ablated Particles with Hydrochloric Acid Gas

Structure and magnetic properties of vanadium–sodium silicate glasses

Natural Oxidation of thin Fe Films on V Buffer Layer

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