Sökning: "in situ neutron diffraction"

Visar resultat 1 - 5 av 15 avhandlingar innehållade orden in situ neutron diffraction.

  1. 1. In-situ phase studies of the Zr-H system

    Författare :Tuerdi Maimaitiyili; Lunds universitet.; Lund University.; Malmö University.; [2014]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; in situ phase transformation; hydrogen embrittlement; hydrogen charging; zirconium hydride; γ-ZrH; synchrotron X-ray diffraction; neutron diffraction; hydrogen induced degradation; NATURAL SCIENCES; NATURVETENSKAP; Sciences; Zirconium hydride; phase transformation; in-situ hydrogen charging; hydrogen related degradation;

    Sammanfattning : Zirconium alloys are widely used in the nuclear industry because of their high strength, good corrosion resistance and low neutron absorption cross-section. However, zirconium has strong affinity for hydrogen, which may lead to hydrogen concentration build-up over time during a corrosion reaction when exposed to water. LÄS MER

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

    Författare :Tuerdi Maimaitiyili; Lunds universitet.; Lund University.; Malmö University.; [2015]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; zirconium hydride; γ-ZrH; synchrotron X-ray diffraction; neutron diffraction; hydrogen charging; in situ phase transformation; hydrogen embrittlement; hydrogen induced degradation; NATURAL SCIENCES; NATURVETENSKAP; Sciences; Zirconium hydride; Nuclear materials; phase transformation; in-situ hydrogen charging; hydrogen related degradation; powder diffraction; Rietveld analysis;

    Sammanfattning : Popular Abstract in English Zirconium alloys are widely used in nuclear power reactors as cladding material for their fuels due to the high strength, good corrosion resistance and low neutron absorption cross-section, even in extreme environment, that is characteristic for zirconium. The element, however, also has strong affinity for hydrogen, and when both are present they readily react and form a family of compounds called hydrides. LÄS MER

  3. 3. Heterogeneous deformation of multi-phase engineering materials - an in-situ neutron diffraction study

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :Nitesh Jaladurgam; [2019]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Superalloys; Electron microscopy; Eutectic high entropy alloys; Deformation mechanisms; in-situ neutron diffraction;

    Sammanfattning : Gas turbines are complex power generation systems used in aerospace or land-based-power stations. Materials such as Ni-base superalloys are involved in the combustion zone of these machines, which continuously experiences harsh environments with loading at high temperatures. LÄS MER

  4. 4. Proton Conducting Ceramics; Synthesis, Characterization and Sample Cell Environments

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :FRANCIS GACHAO KINYANJUI; [2012]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; perovskites; neutron diffraction; Rietveld refinements; BaSnO3; in-situ cell; deuteron position; proton conduction; BaZrO3;

    Sammanfattning : Acceptor doped Perovskite ceramics have been shown to exhibit high levels of protonic conduction in humid atmospheres. However significant grain boundary resistance and long sintering times required to achieve sufficient grain size growth has hindered their widespread application as electrolyzers, fuel cells and gas separation membranes. LÄS MER

  5. 5. Functional Oxide Materials exhibiting Ionic Conductivity for Future Energy Conversion Needs

    Detta är en avhandling från ; Chalmers tekniska högskola; Gothenburg

    Författare :FRANCIS GACHAO KINYANJUI; [2013]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; neutron diffraction; perovskites; oxygen deficient perovskites; BaSnO3; Rietveld refinements; BaZrO3; in-situ cells; proton conduction; deuteron position; Ba3In2ZrO8;

    Sammanfattning : Fuel cells are electrochemical devices that transform the chemical energy in hydrogen and oxygen into electrical energy at high efficiencies and produce only water vapour emissions. Materials with the perovskite or fluorite structure types are commonly employed as the ion conducting ceramic electrolyte membranes in intermediate and high temperature fuel cells. LÄS MER