Search for dissertations about: "Amorphous States"

Showing result 1 - 5 of 25 swedish dissertations containing the words Amorphous States.

2. 1. Pressure-Induced Amorphization and Distinct Amorphous States of Clathrate Hydrates

   Author : Paulo H. B. Brant Carvalho; Ulrich Häussermann; Ove Andersson; John Stephen Loveday; Stockholms universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Clathrate Hydrates; Pressure-Induced Amorphization; Amorphous States; Glassy States; Ice; Neutron Diffraction; Klatrathydrater; Tryckinducerad Amorfisering; Amorfa tillstånd; Glasartade tillstånd; Is; Neutrondiffraktion; Physical Chemistry; fysikalisk kemi;

   Abstract : This thesis summarizes a study on the pressure-induced amorphization (PIA) and structures of amorphous states of clathrate hydrates (CHs).PIA involves the transition of a crystalline material into an amorphous solid in response of mechanical compression at temperatures well below the melting point. READ MORE

4. 2. Metal Hydrogen Interaction and Structural Characterization of Amorphous Materials from first principles

   Author : Robert Johansson; Ralph Scheicher; Olle Eriksson; Rajeev Ahuja; Peter Mohn; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; hydrogen; vanadium; zintl; laves; strain; diffusion; amorphous; dft; molecular dynamics; md; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Abstract : In this thesis, first-principles calculations based on density functional theory have been employed to investigate metal hydrogen interaction in transition, p-block and rare earth metals. Furthermore, the accuracy of the stochastic quenching method was tested in describing the structure of amorphous Fe(1-x)Zrx. READ MORE

5. 3. X-ray Spectroscopic Studies of Materials for Nuclear Technology

   Author : Johan Vegelius; Sergei Butorin; Frank de Groot; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; XAS; XES; RIXS; amorphous; DOS; spectroscopy; actinides; copper; uranium; plutonium;

   Abstract : X-ray spectroscopic experiments, including X-ray absorption spectroscopy (XAS), X-ray emission spectroscopy (XES) and resonant inelastic X-ray scattering (RIXS), were performed in a large energy range (60-9000 eV) on a variety of systems, probing different elements and orbitals. The systems can preferably be divided into three groups: Actinides, copper systems and amorphous materials. READ MORE

6. 4. Dynamic and quasi-stationary electrochromic response of amorphous tungsten oxide thin films : In situ combined electrochemical and optical measurements during lithium intercalation

   Author : Edgar Alonso Rojas González; Gunnar Niklasson; Aline Rougier; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Electrochromism; Optical absorption; Amorphous materials; Tungsten oxide; Electrochemical impedance spectroscopy; Color impedance spectroscopy; Intercalation; Engineering Science with specialization in Solid State Physics; Teknisk fysik med inriktning mot fasta tillståndets fysik;

   Abstract : Electrochromic (EC) materials can adjust their optical properties, reversibly, by means of an external electrical stimulus. They have relevant technological applications; for example, energy-efficient smart windows, which can adapt dynamically—according to the given environmental conditions—to control the heat and visible light fluxes between the interior and exterior of a building. READ MORE

7. 5. Atomic short-range order, optical and electronic properties of amorphous transition metal oxides : An experimental and theoretical study of amorphous titanium aTiO2 and tungsten aWO3 solid thin-film oxides

   Author : Carlos A Triana; Tomas Edvinsson; Petter Persson; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; X-ray-Absorption; Reverse Monte Carlo; Molecular dynamics; Electronic structure;

   Abstract : Amorphous transition metal oxides [aTMOs], have emerged as innovative functional materials for wide-ranging electronic, optical and energy-related applications. However, no systematic and broadly applicable method exists to assess their atomic-scale correlations, and since the optical and electronic processes are local structure-dependent, still there are not well-stablished mechanisms that suitably explain the physical properties of aTMOs. READ MORE