Topic
Chemical state
About: Chemical state is a research topic. Over the lifetime, 2378 publications have been published within this topic receiving 78183 citations.
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TL;DR: In this article, the behavior of polycrystalline Ag-Mn alloys from room temperature to 650 °C in high vacuum and in 5 m Torr O2 has been investigated by x-ray photoelectron spectroscopy.
Abstract: The oxidation of several compositions (5, 9 and 14% Mn) of polycrystalline Ag-Mn alloys from room temperature to 650 °C in high vacuum and in 5 m Torr O2 has been investigated by x-ray photoelectron spectroscopy (XPS). The behavior of the oxidation and the nature of the oxide films are controlled by tempearature, oxygen pressure, bulk alloy composition and the stability of the oxide overlayers. At low temperatures and pressures, the oxidation process is controlled by the relative free energies of oxide formation of the alloy components. At high temperatures the oxide of stabilities play a large role in determining the oxidation state of the oxide overlayer. The chemical state and the morphology of the oxide of manganese formed during the alloy oxidation has been examined. The chemical state and the morphology of the oxide overlayers have been studied by XPS, x-ray diffraction (XRD) and scanning electron microscopy (SEM). The complex oxidation process has been delineated.
21 citations
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TL;DR: In this paper, the structure of SiO x materials and the chemical stability of Si n+ (n < 4) species have been investigated experimentally by photoemission and X-ray absorption spectroscopy.
21 citations
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TL;DR: Auger parameters for a variety of silicon compounds have been measured by a combination of XPS using both AIKα ZrLα characteristic x-radiation, and of XAES using Bremsstrahlung radiation as mentioned in this paper.
Abstract: Auger Parameters for a variety of silicon compounds have been measured by a combination of XPS using both AIKα ZrLα characteristic x-radiation, and of XAES using Bremsstrahlung radiation. The Parameters so derived have then been used to study the chemical states of silicon at and near interfaces in the oxide film formed by air-and CO2-oxidation of Fe/Si alloys. Supportive evidence for the interpretations is provided by the widths and shapes of the silicon KL2,3 L2,3 Auger peaks.
21 citations
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TL;DR: In this article, X-ray photoelectron spectroscopy (XPS) was used in conjugation with sessile drop wettability tests to examine the interfacial properties and surface chemistry of the systems formed by adding liquid drops of select Al-Ti alloys to graphite substrates.
Abstract: The chemical and physical interaction of liquid metal surfaces with various substrates is an important, largely unexplored aspect of technology, with implications in composite science and catalysis. In the present case, we have employed X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES), in conjugation with sessile drop wettability tests, to examine the interfacial properties and surface chemistry of the systems formed by adding liquid drops of select Al–Ti alloys to graphite substrates. A variety of different chemical states was revealed in the XPS results, suggesting the formation of separate regions composed of elemental metals, alloys and carbides. Many of the specific features detected appear to depend on the various treatment properties, e.g. the temperature, bulk alloy composition, size and shape of the alloy drop and time of interaction. The surface analyses were also supported by optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD) studies. The combined results suggest the induction of a strong reaction between titanium and carbon, resulting in an improvement in the wettability of the alloy with the graphite substrate and a corresponding structure transformation from the (LAl–Ti+Al3Ti) state to the (LAl–Ti+TiC) semi-liquid state. © 1998 Kluwer Academic Publishers
21 citations
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TL;DR: In this article, the laser-induced chemical vapor deposition (LCVD) of thin iron films from Fe(CO)5 has been studied under high-vacuum conditions (base pressure < 2 × 10-7 Torr), and the content and chemical state of the carbon and oxygen in the film examined by profiling AES and XPS analysis.
21 citations