Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 37 for “"X-ray diffraction patterns"”.
-
AtomicControl : a crystallography simulator
… to aid in the teaching of crystallography and x-ray diffraction concepts to materials science students. It has the capability to create an arbitrary crystal structure based on the user's specification of a space group and atomic coordinates. It also can generate a simulated powder diffractogram …
-
X-ray diffraction study of aged copper beryllium alloys
X-ray polycrystalline diffraction techniques are used to determined the defect structure in a commercial Cu-l1.55 at. %Be-O.23 at. %Co alloy during low temperature aging. The analysis of the X-ray diffraction patterns is aided by the computer modeling of the defects inside the crystals using an …
-
Synthesis, characterisation and olefin oligomerization over nickel, cobalt and zinc substituted synthetic mica montmorillonite
… for structural octahedral aluminium in SMM. X-ray diffraction, together with elemental analysis, confirmed that a 2: 1 layered aluminosilicate had been formed. The inclusion of these metals facilitated the crystallisation of the SMM structure in the synthesis process as was shown by their more …
-
Sputter deposition and plasma modification of tungsten alloys for nuclear fusion applications
… phase transition from A15 to BCC structure. X-ray diffraction patterns confirmed the presence of an A15 structure prior to annealing. The A15 phase was very stable in comparison with past results, requiring over 2 hours at 650◦C to transition to BCC. This was speculated to be linked to oxygen …
-
Sputter deposition and plasma modification of tungsten alloys for nuclear fusion applications
… phase transition from A15 to BCC structure. X-ray diffraction patterns confirmed the presence of an A15 structure prior to annealing. The A15 phase was very stable in comparison with past results, requiring over 2 hours at 650◦C to transition to BCC. This was speculated to be linked to oxygen …
-
New Catalysts for Hydroprocessing: Molybdenum and Tungsten Phosphide
… semiconducting or insulating properties. The x-ray diffraction patterns of the phosphides studied here were unchanged under the conditions of catalytic hydroprocessing, demonstrating their stability toward the hydroprocessing conditions and allowing study of their intrinsic catalytic properties. …
-
Structural Characterization and Thermoelectric Performance of ZrNiSn Half-Heusler Compound Synthesized by Mechanical Alloying
… Plasma Sintering (SPS) or hot pressing (HP). X-Ray diffraction patterns of as milled powders and consolidated samples were compared and analyzed for phase purity. Thermal conductivity, electrical conductivity and Seebeck coefficient are measured as a function of temperature in the range 300 K to …
-
X-ray diffraction studies of muscle : observations on the anterior byssus retractor muscle of Mytilus edulis and the insect flight muscle from Sarcophaga bullata
… that the interfilament spacing was increasing. X-ray diffraction patterns were obtained from fresh, and glutaraldehyde fixed, specimens of insect flight muscle from Sarcophaga bullata. There patterns were in general agreement with previous X-ray diffraction studies of insect flight muscle. A …
-
Microwave synthesis and occlusion reactions of zeolites
… non-framework peaks are seen in the powder X-ray diffraction patterns of occluded samples. These peaks are attributed to the formation of a superlattice within the zeolite cavities. Particular attention is given to the structural identification of the silver nitrate superlattice formed within …
-
Synthesis and characterization of atmospheric pressure chemically vapor deposited aluminum
… rates as high as 1.2 um/min were achieved. X-ray photoelectron spectroscopy, auger electron spectroscopy, glow discharge optical emission spectroscopy and nuclear reaction analysis revealed that the coatings consisted essentially of pure aluminum (~99 at.%) with oxygen and carbon present as …
-
Structure property and deformation analysis of polypropylene montmorillonite nanocomposites.
… of transmission electron micrographs and X-ray diffraction patterns on the surface and below the surface of our samples revealed a unique skin-core effect induced by the presence of clay. Differential scanning calorimetric and polarized optical microscopic examination of spherulites sizes …
-
Part 1. the mesomorphic properties of arloxy-s-triazines and their analogs, Part 2. the synthesis and polymerization behavior of α-aminonitriles and related compounds
… crystals based on the optical textures and X-ray diffraction patterns in the mesophase. This is in direct conflict with published but unsubstantiated reports of the "discotic” behavior of similar compounds. The failure of these compounds to give crystals suitable for X-ray crystal structural …
-
Effects of Chemical and Enzymatic Modifications on Starch and Naringenin Complexation
… when β-amylase treatment was incorporated. The X-ray diffraction patterns of both complexes revealed a mixture of amorphous and crystalline structure. FT-IR results confirmed the occurrence of molecular interaction between starch and naringenin in both complexes. Melting properties were …
-
Problems associated with the quantitative estimation of asbestos.
… Project is concerned with the application of X ray diffraction techniques to the Union Internationale Contre le Cancer (U.I.C.C.) standard reference samples of asbestos, (1) The experimental techniques adopted are based upon methods employed by Crable (2) and Crable and Knott (3). However, in …
-
Molecular origins of cocoa butter triclinic polymorphism
… were discovered. Small and wide-angle powder x-ray diffraction patterns of these β3 and β1 crystal polymorphs of POS were identical to those of crystal forms V and VI in cocoa butter, while those of SOS and POP were not. Moreover, we also discovered that the crystal structure of CB in its …
-
Preparation, Characterization and Performance Study of Modified Titanium Dioxide Nanocrystals for the Lithium-Ion Battery
… with: transmission electron microscopy, x-ray diffraction patterns, Raman spectroscopy, Fourier transform infrared spectroscopy, thermal gravimetric analysis, ¹H magic-angle spinning solid state nuclear magnetic resonance spectroscopy, electron spin resonance spectroscopy, and x-ray …
-
Magnetic and Structural Instabilities in Cerium Diantimonides under Pressure
… CeSb₂. Structure refinements of high-pressure x-ray diffraction patterns at 300 K and ab initio numerical structure calculations point towards a pressure-induced transition from the SmSb₂ structure (Cmca) to the more compact YbSb₂ structure (Cmcm). This structure sets symmetry constraints for the …
-
Preparation and characterization of lead lanthanum titanate thin films by metalorganic decomposition
… also studied for 0% to 20% of excess PbO. The x-ray diffraction patterns of all films at room temperature indicated a cubic structure with lattice constant of 3.92 A. Optical and electrical measurements showed that the films made assuming B-site vacancies had better properties. In general, excess …
-
X-RAY CHARACTERIZATION OF PLATINUM GROUP METAL CATALYSTS
… establishing the structure/property link. X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) are important techniques used for the characterization of PGM catalysts. Microstructural information such as crystallite size, as small as ~ 1 nm, and microstrain can be obtained from …
Page 1 of 2