Sökning: "Neutron diffraction"

Visar resultat 26 - 30 av 130 avhandlingar innehållade orden Neutron diffraction.

1. 26. Structure Modeling with X-ray Absorption and Reverse Monte Carlo: Applications to Water

   Författare :Mikael Leetmaa; Lars G M Pettersson; John Rehr; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; water structure; x-ray absorption; spectroscopy; diffraction; reverse monte carlo; XAS; EXAFS; XANES; RMC; TP-DFT spectrum calculations; Physics; Fysik; kemisk fysik; Chemical Physics;

   Sammanfattning : Water is an important substance. It is part of us, of our environment, and is a fundamental prerequisite for the existence of life as we know it. The structure of water is still, after over 100 years of research on the subject, however under debate. LÄS MER

3. 27. The Structural Basis for Magnetic Order in New Manganese Compounds

   Författare :Therese Eriksson; Yvonne Andersson; Helmer Fjellvåg; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; Crystal structure; Magnetic structure; Manganese compounds; Transition metal silicides; Transition metal germanides; Magnetic frustration; Neutron powder diffraction; X-ray diffraction; Magnetisation measurements; DFT; Oorganisk kemi; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : Materials with new or improved properties are crucial for technological development. To provide the foundation for future successful products, it is important to prepare and characterise new chemical compounds that could show unusual properties. LÄS MER

4. 28. Acceptor-Doped BaZrO3 Perovskite: Synthesis, Structure and Proton Conductivity

   Författare :Istaq Ahmed; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Impedance spectroscopy; Perovskite; Neutron diffraction; Rietveld refinement; BaZrO3.; Proton conductor;

   Sammanfattning : Acceptor-doped perovskite oxides exhibit significant proton conductivity in hydrogen containing atmospheres. Therefore, they have potential for use as separator materials for various electrochemical devices including gas sensors, electrolysers and fuel cells. LÄS MER

5. 29. Pressure-Induced Amorphization and Distinct Amorphous States of Clathrate Hydrates

   Författare :Paulo H. B. Brant Carvalho; Ulrich Häussermann; Ove Andersson; John Stephen Loveday; Stockholms universitet; []
   Nyckelord :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;

   Sammanfattning : 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. LÄS MER

7. 30. Crystal Chemistry of the Ti3Sn-D, Nb4MSi-D and Pd-Ni-P Systems

   Författare :Marie Vennström; Yvonne Andersson; Gudrun Auffermann; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Inorganic chemistry; metal hydride; energy carrier; crystal structure; diffraction; transition metal phosphide; Oorganisk kemi; Inorganic chemistry; Oorganisk kemi; Inorganic Chemistry; Oorganisk kemi;

   Sammanfattning : Future energy systems based on hydrogen as energy carrier require reliable ways for storing hydrogen gas in safe, clean and efficient ways. Metal hydrides absorb hydrogen gas reversibly, making them suitable for storage applications. LÄS MER