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The results are reported of X-ray photoelectron spectroscopy (XPS) analysis of the oxidation of Ag-MgF 2 cermet film. In low vacuum (> 30 Pa), a Ag-MgF 2 film is subjected to oxidation when annealing temperature is higher than 900 o C and the film will completely change to MgO film when annealing temperature reaches 1100 o C. Chemical shift of photoelectron binding...
MgF 2 , which has a highly stable chemical structure, was observed to oxidize, forming MgO when a 30 wt% Ag-MgF 2 cermet was subjected to oxidation in a low vacuum >100Pa at a sintering temperature of 600 o C or above. To avoid MgO formation the vacuum gas pressure needed to be below 10 -3 Pa.
Conjugated polyalkynyl carbon chains, candidates for molecular wires, (η 5 -C 5 Me 5 )Re(NO)(PPh 3 )(C≡C) n (Ph 3 P)(ON)Re(η 5 -C 5 Me 5 ) (n=2 (Re*C 4 Re*), 4 (Re*C 8 Re*), 6 (Re*C 12 Re*)), have been deposited as thin films on air passivated copper surfaces and examined by X-ray photoelectron spectroscopy...
The oxide growth during the decarburization process of non-oriented silicon steel sheets alloyed with 0.5 and 1 mass% of aluminium was studied using high-resolution auger electron spectroscopy (HRAES), the chemical composition was characterized by X-ray photoelectron spectroscopy (XPS). The samples were annealed in a H 2 -H 2 O-N 2 gas mixture with different oxygen potential...
The paper reviews the results which have been obtained over the 5 recent years at the Institute for Superhard Materials of the National Academy of Sciences of Ukraine in the field of investigation of surface properties of carbon films (diamond, diamond-like) by different experimental methods (XAES, XPS, AFM, RS-, ESR-, and IR-spectroscopies and wetting). The principal emphasis has been on the use...
X-ray photoelectron spectroscopy (XPS) has seen widespread use in applied and basic surface science studies since 1970. Its capabilities appear to be undergoing a series of improvements, due both to technological changes and to the culmination of efforts by the XPS community to solve a series of scientific questions that underlie the technique. This paper describes some of the advances made in the...
In this study, for the first time, it is shown how the heating of an In-80Sn alloy affects its morphology and surface chemical composition. The study of the initial phases of surface oxidation of the pure In-80Sn alloy at room temperature revealed the formation of a mixture of In 2 O 3 , SnO and SnO 2 oxides with a dominant contribution of In 2 O 3 . The high...
The etching of different polymers versus the dose of neutral oxygen atoms was measured in an oxygen plasma post-glow reactor. The source of neutral oxygen atoms was an inductively coupled RF oxygen plasma with an electron temperature of 5eV and a density of about 10 16 m -3 . The density of oxygen atoms in the post-glow reactor was measured with a catalytic probe. The density...
A Pt 3 Co(110)c(2x4)-O surface has been investigated by scanning tunneling microscopy (STM), low-energy electron diffraction, and Auger electron spectroscopy. At a very initial oxidation stage exposed at 500 o C, creation of missing and/or added row structures running to the [001] direction on clean Pt 3 Co(110)2x1 surface was imaged from the steps. The surface is fully covered...
Rh and Al mixed thin films deposited on the gamma-alumina surface were studied. Auger electron spectroscopy as well as thermal desorption spectroscopy (TDS) results showed significant alloying of Rh and Al after the first annealing of the system. CO thermal desorption results were strongly influenced by the previous CO adsorption-desorption cycles, showing strong CO adsorbate-induced reversible changes...
We have performed first principles pseudopotential calculations for catalytic CO oxidation on Pd doped Ag(111) surface. We discuss the effect of the change in the atomic geometry and surface electronic structure on the adsorption and reaction mechanism when alloying Ag with Pd. Pd doped Ag(111) works as a better catalyst for CO oxidation than the pure elemental Ag surface since Pd acts as an electronic...
The purpose of this work was to determine the influence of ion implantation on the oxidation resistance of ZrN coatings. Samples were prepared on AISI 304 stainless steel by cathodic arc deposition. They were submitted to Y implantation at 150°C with various fluences using a metal vacuum vapour arc ion implanter. The oxidation behaviour of as-deposited and Y-implanted ZrN coatings was characterized...
The existence of Cu 3 O 2 , a gross defect structure of Cu 2 O, has been documented experimentally since the early 1960s. However, discussions of the oxidation of copper often neglect the importance of this phase; in fact, it is often omitted entirely from such discussions. This results from the difficulty in determining the chemical state during sputter depth profiling and...
The interaction of H 2 O with Si(100)2×1 surface, maintained at 350°C, has been analysed by LEED, AES, and photoemission yield spectroscopy (PYS). The water vapour is adsorbed dissociatively on H and O. The oxygen atom breaks the dimers that induce the creation of new dangling bonds, which have been passivated by oxygen. The hydrogen atom is bonded to the dangling bonds of the dimers. The...
The interaction of oxygen with a carbidized Mo(100) surface was investigated at different temperatures (300 K–1000K) with-angle resolved X-ray photoelectron spectroscopy. A carbide overlayer with a homogeneous Mo 2 C stoichiometry (down to the information depth of XPS) was produced by the high-temperature decomposition of C 2 H 4 on Mo(100).O 2 adsorbs dissociatively...
The beneficial effect of titanium ion implantation on the oxidation behaviour of zircalloy-4 at 500°C was investigated. Titanium ions were implanted by a MEVVA source at an energy of 40keV with dose 5×10 16 , 1×10 17 , and 2×10 17 ion/cm 2 at the maximum temperature 130°C. Weight gain curves of the as-received and implanted zircalloy-4 were measured after oxidation...
Auger electron spectroscopy (AES) depth profiling was used to study the oxidation phenomena of AISI316L stainless steel during treatment with oxygen plasma. Samples were exposed to low-pressure RF plasma with a high dissociation degree, so that the flux of oxygen atoms onto the sample surface exceeded 10 24 m −2 s −1 . A set of samples was oxidized 4min at different temperatures...
Tungsten oxide plays an important role in a variety of electrochromic devices, catalysts and chemical sensors. Doping of the surface of these devices by any active metal can be used to control their sensitivity and selectivity. Fundamental studies of the dependency of physical and chemical properties on the device structure are often performed on well-defined epitaxial (model) systems.In our studies,...
Using a non-transferred DC plasma spray torch, nanosized alumina particles were synthesized from micron-sized aluminium particles. Irregular-shaped micron-sized alumina particles were spheroidized using the plasma spray torch. The synthesized powder particles were characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) analysis,...
Preparation and oxidation of an Y 2 O 3 -dispersed chromizing coating was investigated by chromizing an as-electrodeposited Ni–Y 2 O 3 composite film using a conventional pack-cementation method but at a greatly decreased temperature (800°C). For comparison, chromizing was also performed in the same condition on an as-deposited Ni film without Y 2 O 3 ...
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