نتایج جستجو برای: ray diffraction measurement then

تعداد نتایج: 1484604  

Journal: :journal of nanostructures 2012
r. raeisi shahraki m. ebrahimi

superparamagnetic single phase zinc ferrite nanoparticles have been prepared by coprecipitation method at 20 °c without any subsequent calcination. the composition, crystallite size, microstructure and magnetic properties of the prepared nanoparticles were investigated using x-ray diffraction (xrd), field emission scanning electron microscope (fesem), transmission electron microscope (tem), fou...

Journal: :journal of sciences islamic republic of iran 0

copper films of 300 nm thickness deposited by planar magnetron sputtering on glass substrates, for substrate temperatures between 300 and 500 k, and deposition rate of 10 ?s?1. microstructure of these films was obtained by x-ray diffraction, while the texture mode of diffractometer was used for stress measurement by the sin2? technique. the components of the stress tensor are obtained using mea...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی اصفهان - دانشکده شیمی 1389

in this thesis, a new optically active poly(amide-imide) (pai) was synthesized by the indirect polycondensation reaction of the l-phenylalanine based diacid chloride and 4,4?-diaminodiphenylether in the presence of triethylamine in n-methyl-2-pyrrolidone. the formation of pai was confirmed by ftir, 1h nmr and elemental analysis. in next step, the surface of titanium dioxide (tio2) nanoparticles...

2006
Longlan Cui Hongchen Gu Hong Xu Donglu Shi

Superparamagnetic nanorings of polystyrene/Fe3O4 composite were synthesized by miniemulsion polymerization. The nanoring structure was characterized by using transmission electron microscopy, scanning electron microscopy, and atomic force microscopy. The results of X-ray diffraction identified the magnetic constituent of as-synthesized composite nanorings as Fe3O4. The magnetization measurement...

Journal: :Environmental Health Perspectives 1974
Arthur N. Rohl

Talc deposits include asbestos minerals such as chrysotile and amphiboles that may be carried over into consumer products. Optical microscopy and x-ray diffraction analyses may not reveal their presence. Examples are given of electron microscopy procedures that permit detection and measurement.

1998
Muneyuki Imafuku

Texture mapping system with energy dispersive X-ray diffraction method has been newly developed. Total time of measurement was reduced more than half by the adoption of a fast data transmission interface. Some examples are demonstrated in order to show the performance of the system. This approach is suitable for the study of local inhomogeneities of texture, such as colonies, in polycrystalline...

Journal: :Acta crystallographica. Section A, Foundations of crystallography 2013
C J Humphreys

Bragg's second law, which deserves to be more widely known, is recounted. The significance of Bragg's law in electron diffraction and microscopy is then discussed, with particular emphasis on differences between X-ray and electron diffraction. As an example of such differences, the critical voltage effect in electron diffraction is described. It is then shown that the lattice imaging of crystal...

Journal: :Nature 1971

Journal: :مهندسی متالورژی و مواد 0
نگار عباسی اول خدیجه فرجام حسین آقاجانی

in this study, the effect of grain size on nitrogen diffusion into ck45 has been investigated. in order to obtain different grain sizes, samples were annealed and normalized at various temperatures and durations.the grain size was determined with clemex vision software. then, the specimens were exposed to dc plasma nitriding treatment and again analyzed by optical microscope ,scanning electron ...

Journal: :journal of nanostructures 2016
m. ahmadi golsefidi f. abbasi m. abrodi z. abbasi f. yazarlou

in this pepper fe2o3 nanoparticles were synthesized via a fast microwave method. then fe2o3-tio2 nanocomposites were synthesized by a sonochemical-assisted method. the prepared products were characterized by x-ray diffraction pattern, scanning electron microscopy and fourier transform infrared spectroscopy. the photocatalytic behaviour of fe2o3-tio2 nanocomposites was evaluated using the degrad...

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