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Showing 1 to 20 of 85 for “"phase formation,"”.
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Phase formation and structural transformation of strontium ferrite SrFeOx
Non-stoichiometric strontium iron oxide is described by an abbreviated formula SrFeOx (2.5 ≤ x ≤ 3.0) exhibits a variety of interesting physical and chemical properties over a broad range of temperatures and in different gaseous environments. The oxide contains a mixture of iron in the trivalent …
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Phase formation and structural transformation of strontium ferrite SrFeOx
Non-stoichiometric strontium iron oxide is described by an abbreviated formula SrFeOx (2.5 ≤ x ≤ 3.0) exhibits a variety of interesting physical and chemical properties over a broad range of temperatures and in different gaseous environments. The oxide contains a mixture of iron in the trivalent …
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Phase formation sequence at metal-germanium interfaces in thin film systems.
… This thesis concerns itself mainly with phase formation in metal-germanium systems. Characterisation of samples after heating in a vacuum furnace was done by Rutherford Backscattering Spectrometry (RBS) and X-Ray Diffraction (XRD). Ti-Ge, Pd-Ge, Zr-Ge, Fe-Ge and Cr-Ge thin film systems …
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Photophysical Studies of Beta Phase Formation in Poly(9,9-di-n-alkylfluorenes)
… take place in Poly(9,9-di-n-alkylfluorenes) upon formation of the beta phase in methylcyclohexane solution are observed by optical spectroscopy. The equilibrium absorption spectra as a function of temperature show that conformational changes occur for all five polymers studied, from the hexyl …
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Lattice Strain Measurements of Deuteride Phase Formation in Epitaxial Niobium on Sapphire
Evidence of significant dislocation formation has been confirmed with high-resolution electron microscopy (HREM) for the 1200A Nb film. The HREM images were used to estimate a dislocation density of 1012 cm-2 after repeated cycling. A residual out-of-plane compressive strain was observed in the …
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Phase Formation, Liquid Structure, and Physical Properties of Amorphous- and Quasicrystal-forming Alloys
… for determining supercooled liquid structure and phase formation insitu, was used. Using BESL, the development of structural and chemical inhomogeneity was observed in supercooled liquid Cu46Zr54: a BMG when cast) with an onset at 845 ┬▒ 5┬░C, providing experimental support for structural changes …
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Electrochemical Phase Formation of Ni and Ni-Fe Alloys in a Magnetic Field
The aim of this work was to investigate the effects that a magnetic field can induce during the electrodeposition of Ni and Ni-Fe alloys. Special regard was given to mass transport controlled effects. Magnetic field effects on the nucleation and growth of ferromagnetic layers and on the properties …
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Complex oxides of the system Cu-Ni-Fe-O: synthesis parameters, phase formation and properties
… oxygen partial presssure) which lead to the formation of single phase materials within the quaternary system Cu-Ni-Fe-O. The investigated compositions are the solid solutions CuxNi1-xFe2O4, the ferrites occurring in the phase triangle Cu0.5Ni0.5Fe2O4 -Cu0.9Fe2.1O4 - Cu0.5Fe2.5O4 and some …
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Gas-Phase Formation of Environmentally Persistent Free Radicals from Thermal Degradation of Catechol, Hydroquinone, Phenols and Tobacco
… responsible of Reactive Oxygen Species (ROS) formation. ROS such as hydroxyl radicals can cause severe oxidative stress on biological tissues and can provoke severe signaling pathways leading to cardiovascular and pulmonary dysfunctions and carcinogenesis. Given that semiquinone type radicals …
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The chemistry of chlorine in combustion systems and the gas-phase formation of chlorinated and oxygenated pollutants
… the combustion of chlorinated fuels is the formation of chlorinated organic pollutants, which are potentially dangerous to human health and to the environment. Observed combustion byproducts include suspected carcinogenic and toxic compounds, such as chlorobenzenes, chlorophenols, and …
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I. Stereochemical Control of Chiral Assembly and Liquid Crystal Phase Formation of Nonamphiphilic Molecules in Water II. Control Bacterial Quorum Sensing and Quorum Sensing-mediated Activities Using Small Unnatural Molecules
… 1 describes the interpretation of the conformation of nonamphiphilic mesogen disodium cromoglycate (5´DSCG) when it exists as part of an assembly in water. The study of thermodynamic incompatibility and miscibility suggest that a previously proposed model for the assembly of 5´DSCG may be …
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Synthesis and characterization of plasma enhanced chemically vapor deposited tantalum films
… detected by NRA. These studies indicated that a phase predominant Ta coatings with traces of oxygen, carbon, chlorine, and hydrogen were deposited by PECVD method. The coatings properties had been investigated in relation to deposition temperature, precursor temperature, RF input power, plasma …
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Reactions of thin film bilayers of nickel on silicon-germanium alloys
… vacuum annealing of the bilayers, yields information about changes in the whole electrically conductive volume of the film structure. In-situ X-ray Photoelectron Spectroscopy (XPS) is also done during vacuum annealing of the bilayer structure, and yields information about phase changes that …
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In-situ measurements of the Liquid-Phase Sintering of Zinc Oxide
… is the basic system for ceramic varistors. Phase formation during sintering of ZBS was measured in situ, using 1 mm thick samples and synchrotron X-rays. Thermodynamic calculations were performed to explain phase formation, composition, stability of additive oxides and influence of the …
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An investigation of phase transformations in Pt-V coating systems
Phase transformations in Pt-V coatings after heat treatment have been investigated. Five Pt- V ordered phases (PtV, PtV 3 , Pt 2 V, Pt 3 V and Pt 8 V) have been previously observed in bulk platinum-vanadium alloys. Phase formation in coatings is expected to be sequential and controlled by the …
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BSCCO superconductors processed by the glass-ceramic route
… that the copper valence dependence on the phase formation and crystallization of the high-TC phase plays an important role in the BSCCO system. It could also be demonstrated that the smallest chemical deviation could strongly influence the phase formation in dependence of melt temperature, …
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Control of Thin-Film Silicon Microstructure With Low-Energy Particle Bombardment in Reactive Sputtering
… can be added to the growth chamber to promote a phase change to nanocrystalline silicon at moderate growth temperatures. The growth flux with hydrogen includes energetic (∼100eV) neutral H, produced by the reflection of H2+ions from the target. We determine the kinetic role of these fast H …
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Structural Characterization and Material Property Evaluation in Polymer-Derived SiOC Ceramics and Ceramic Nanocomposites
… detector limitations. Therefore, understanding phase evolution in SiOC is critical for further development and commercial application of SiOC ceramics and ceramic composites. This work focuses on fabrication and characterization of novel SiOC ceramics and ceramic nanocomposites to examine phase …
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Interactions of WF(6) With TiN/Ti Barriers During W Chemical Vapor Deposition
… of delamination. High F concentration causes phase formation and alters the chemistry of the Ti/SiO$\sb2$ interface. Large stresses generated due to TiF$\sb3$ formation, and destruction of the Ti glue layer due to TiF$\sb4$ evolution jeopardize the adhesion of the TiN/Ti bilayer at the …
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