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Showing 1 to 20 of 26 for “"crystal lattices"”.
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Atomistic characterization of stress-driven configurational instability and its activation mechanisms
… are two basic modes of localized deformation in crystal lattices, which normally result from instability of the atomic configuration driven by mechanical forces. The critical state of instability and its thermal activation mechanisms can be quantitatively determined by analyzing the energetics of …
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Preliminary Experiments on Photo-Electro Catalytic Oxidation of Recalcitrant Organic Compounds Dissolved in Water
… doping chromium (III) ion into titanium dioxide crystal lattices and silver ions into the photocatalytic coat. Degradation curves were determined by total organic carbon and the chemical oxygen demand. Calculations of the final rate constants show that lighter molar concentrations have higher …
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The Synthesis of Core-Shell Iron@Gold Nanoparticles and Their Characterization
… show clear core-shell structure with different crystal lattices from Fe and Au. SQUID magnetometry reveals that particle magnetic properties are not significantly affected by the overlayer of a moderately thick Au shell. The Au-coated particles exhibit a surface plasmon resonance peak that …
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Explore the Formation of Triplet Nitrene - A Potential Intermediate for Building Organic Magnets
… transient spectra of triplet vinylnitrene in nanocrystals while the lifetime of triplet vinylnitrene in solid-state is elongated to be 42 µs. The crystal lattices stabilize triplet vinylnitrene and thus it is possible to use crystal lattices to render triplet vinylnitrenes stable and use their …
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Crystal structure prediction. A molecular modellling study of the solid state behaviour of small organic compounds.
… packing behaviour of small organic compounds in crystal lattices is of great importance for industries dealing with solid state materials. The properties of materials depend on how the molecules arrange themselves in a crystalline environment. Crystal structure prediction provides a theoretical …
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The crystal structure and constitution of some molecular complexes of 4:4- dinitrodiphenyl
The crystal structures or a number of molecular complexes formed by 4:4'-dinitrodiphenyl with various diphenyl derivatives are described. The general type of structure is undoubtedly the same for all the complexes examined and the typical arrangement may be taken as that in the complex of …
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Designing visually rich mathmatical investing tools for repetitive geometric artifacts
… (polyhedra of any dimension), tilings, and crystal lattices, with investigation tools was directed by the combination of their potential for simple algorithmic description and their highly visual nature. There are a number of results that precipitated from the process of design and …
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Hydroxylamine-N, N-disulphonates and nitrosodisulphonates: preparations, characterizations, and magnetic and spectroscopic properties
… salts of the hydroxylamine-N,N-disulphonate ion crystallize with either [(S03)2NOH]2- ions or {[ (S03)2N0]2H}5- groups. In general, salts with [(S03)2NOH]2- ions crystallized from basic aqueous solutions when the pH was less than 11.5 while those containing {[ (S03)2N0]2H}5- groups form on …
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Phase Coexistence in Manganites
… between the electronic, magnetic and crystal lattices, and the wide range of phases that can coexist. The region of greatest interest in the bulk material is around x~0.5, where there is often mesoscopic phase coexistence between a ferromagnetic metal (FM) and an antiferromagnetic …
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High-pressure states of bismuth
… atoms can travel large distances in high-purity crystals, leading to a host of unusual properties. We show that the rhombohedral structure can be tuned with pressure, driving the carrier concentration to nearly zero. We compare our measurements to recent experimental advances implying the …
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A computational investigation of nucleation processes in organic crystals
… the atmosphere, the casting of metals, protein crystallization, biomineralization, the production of porous materials, and separation of pharmaceutical compounds from solution are a few examples of relevant nucleation processes. One pathway for nucleation to occur is homogeneous nucleation, in …
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Quasi-One-Dimensional Ultracold Fermi Gases
… electronic systems, such as superconductors and crystal lattices. In our experiment, we can control the ratio between these two states resulting in either a spin-balanced or a spin-imbalanced gas. Imposing an imbalance is analogous to applying a magnetic field to a superconductor which causes the …
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Engineering of Amorphous Active Pharmaceutical Ingredients by Sonoprecipitation and Spray Drying Pre-and Post-Processing Pharmaceutical Characterisation. Pre- and Post-Processing Physicochemical and Micromeritic Characterisation of Active Pharmaceutical Ingredients
… of amorphous phases are comminution of crystalline materials in order to break down molecular long-range order of their crystal lattices and amorphous phase precipitation from solutions. This thesis is focused on processing challenges in preparation of amorphous API phases from solutions …
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Synthesis and Investigation of Nanomaterials by Homogeneous Nonaqueous Solution Phase Reactions
… process of nanowires, the evolution of the crystallization of metallic products and the mechanism of the formation of the nanowires are investigated. Thirdly, we synthesized core-shell structure nanocomposites, including either gold as the shell or polymer as the shell. Au-coated magnetic Fe …
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Structural phase transitions in synthetic analogues of the titanite structure type
… of the end-member composition CaTiOGeO4 single crystals have been grown from the melt. As the phase transitions encountered in these compounds are of a displacive nature and therefore non-quenchable their observation requires in situ measurements at elevated temperatures. This applies to …
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Anharmonic Helmholtz free energy to O(lambdaâ ´) in the non- leading term approximation /|nby Leslie Wilk. -- 260 St. Catharines, Ont. : [s. n.],
… approximation for a monatomic facecentred cubic crystal with nearest neighbour c entralforce interactions. The numbers obtained were seen to vary by a s much as 47% from thos e obtai.ned in the leading term approximati.on,indicating that the latter approximati on is not in general very good. The …
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Structural dynamics of photoexcited nanolayered perovskites studied by ultrafast x-ray diffraction
… on the transient dynamics in the photoexcited crystal lattices experimental techniques using ultrashort optical and x-ray pulses are employed. The experimental setups include table-top sources as well as large-scale facilities such as synchrotron sources. At the core of my work lies the …
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Calculated cohesive energy of the ordered copper-gold alloy Cu Au I
… diffraction methods(Z, 3). Two ordered superlattices of CuAu are observed. CuAu I exists below 380° C and has a tetragonal structure which is a slight distortion of the face- centered cubic. It is very highly ordered, with all copper and all gold atoms in alternate (002) planes, as shown in …
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Microstructures and oxidation properties in hafnium-tantalum-nitride ceramics
… minimizing oxygen diffusion through close-packed crystal lattices. This oxy-nitride layer was further investigated to analyze the processing-oxidation behavior relationship. It was found that the increase in density for the nitrides processed by the combined vacuum plasma spray and additional …
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