Sökning: "pyrochlore"

Visar resultat 6 - 10 av 11 avhandlingar innehållade ordet pyrochlore.

1. 6. Studies on some pyrochlore type solid electrolytes

   Författare :Jekabs Grins; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This article summarizes ionic conductivity studies on a number of compounds crystallizing in the pyrochlore type structure. The pyrochlore structure is described, and the determination of ionic conductivities by means of impedance measurements is discussed. LÄS MER

3. 7. Studies of phases structurally related to hexagonal tungsten bronze in the system ATO₃ - WO₃ (A = K, Rb, Cs; T = V, Nb, Ta)

   Författare :Renu Sharma; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Volfram;

   Sammanfattning : The oxidized analogues (bronzoids) of tungsten bronzes in the systems dTO^-WO^ with A = K, Rb, Cs; T = Ti, V, Nb, Ta and A/W < 1 are reviewed with emphasis on the K-Nb and Cs-Nb systems. The different phases observed in these systems are isostructural with intergrowth tungsten bronze (ITB), hexagonal tungsten bronze (HTB), tetragonal tungsten bronze (TTB) and pyrochlore. LÄS MER

4. 8. Studies of systems related to high-Tc superconductors by electron microscopy and X-ray powder diffraction

   Författare :Ingrid Bryntse; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : New cuprate systems related to high temperature superconductors have been investigated and are reviewed. The synthesized samples have been studied mainly by transmission electron microscopy, energy-dispersive spectrometry and X-ray powder diffraction, in order to determine composition and structure of the formed phases. LÄS MER

5. 9. Effects of Strong Correlations in Complex Oxides Investigated by Raman Spectroscopy

   Författare :Joakim Holmlund; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Our global environment is under excessive strain and we are facing a possible global climate change. There is a urgent need today for finding both alternative energy sources and new techniques for the transport and storage of energy in order to save our planet in its present status. LÄS MER

7. 10. Correlations in Frustrated Magnets : Classical and Quantum Aspects

   Författare :Sergei Isakov; Anders Karlhede; Frederic Mila; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

   Sammanfattning : In this thesis, we study three different aspects of the physics of frustrated magnets. First, we study the interplay of thermal and quantum fluctuations in the transverse field frustrated Ising model on the triangular lattice. LÄS MER