Search for dissertations about: "POWDER DIFFRACTION"

Showing result 1 - 5 of 146 swedish dissertations containing the words POWDER DIFFRACTION.

2. 1. 3D Electron Diffraction : Application and Development towards High-quality Structure Determination

   Author : Yunchen Wang; Wei Wan; Xiaodong Zou; Junliang Sun; Mauro Gemmi; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; three-dimensional electron diffraction; structure determination; rotation electron diffraction; Inorganic Chemistry; oorganisk kemi;

   Abstract : Electron crystallography has been proven to be effective for structure determination of nano- and micron-sized crystals. In the past few years, 3D electron diffraction (3DED) techniques were used for the structure solution of various types of complex structures such as zeolites, metal-organic frameworks (MOF) and pharmaceutical compounds. READ MORE

4. 2. Studies of Inorganic Layer and Framework Structures Using Time-, Temperature- and Pressure-Resolved Powder Diffraction Techniques

   Author : Anne Krogh Andersen; Rolf Norrestam; Kenny Ståhl; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; inorganic structure; framework structure; x-ray diffraction; synchrotron radiation; powder diffraction; Chemistry; Kemi;

   Abstract : This thesis is concerned with in-situ time-, temperature- and pressure-resolved synchrotron X-ray powder diffraction investigations of a variety of inorganic compounds with twodimensional layer structures and three-dimensional framework structures. In particular, phase stability, reaction kinetics, thermal expansion and compressibility at non-ambient conditions has been studied for 1) Phosphates with composition MIV(HPO4)2·nH2O (MIV = Ti, Zr); 2) Pyrophosphates and pyrovanadates with composition MIVX2O7 (MIV = Ti, Zr and X = P, V); 3) Molybdates with composition ZrMo2O8. READ MORE

5. 3. Phase transformation and stability studies of the Zr-H system

   Author : Tuerdi Maimaitiyili; Lars Hallstadius; Malmö högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Zirconium hydride; synchrotron X-ray diffraction; Nuclear materials; phase transformation; in-situ hydrogen charging; hydrogen related degradation; neutron diffraction; powder diffraction; Rietveld analysis; γ-ZrH; hydrogen embrittlement; zirconium hydride; γ-ZrH; synchrotron X-ray diffraction; neutron diffraction; hydrogen charging; in situ phase transformation; hydrogen embrittlement; hydrogen induced degradation;

   Abstract : Zirconium alloys are widely used in the nuclear industry because of their high strength, good corrosion resistance and low neutron absorption cross-section. Zirconium has a strong affinity for hydrogen, however, and if hydrogen concentration builds up, the material will gradually degrade. READ MORE

6. 4. On Surface Characteristics and Microstructural Development of Soft Magnetic Composite Powder and Components

   Author : Christos Oikonomou; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; X-ray photoelectron spectroscopy; compaction; annealing; X-ray diffraction; soft magnetic composites; high resolution scanning electron microscopy; surface layers; magnetic testing; powder metallurgy; depth profiling; electron backscatter diffraction; focused ion beam; thickness determination; energy dispersive X-ray spectroscopy; microstructure;

   Abstract : Soft Magnetic Composite (SMC) products manufactured by traditional Powder Metallurgical (PM) techniques, are strong candidate materials for electromagnetic applications. Their advantages are based on cost and energy efficient production methods, shape complexity realization and uniquely uniform and isotropic three dimensional (3D) magnetic properties. READ MORE

7. 5. Structure Determination and Prediction of Zeolites : A Combined Study by Electron Diffraction, Powder X-Ray Diffraction and Database Mining

   Author : Peng Guo; Xiaodong Zou; Christine Kirschhock; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; zeolites; rotation electron diffraction; structure determination; structure prediction; strong reflections approach; Inorganic Chemistry; oorganisk kemi;

   Abstract : Zeolites are crystalline microporous aluminosilicates with well-defined cavities or channels of molecular dimensions. They are widely used for applications such as gas adsorption, gas storage, ion exchange and catalysis. The size of the pore opening allows zeolites to be categorized into small, medium, large and extra-large pore zeolites. READ MORE