Search for dissertations about: "BaTiO3"
Showing result 1 - 5 of 18 swedish dissertations containing the word BaTiO3.
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1. Beyond average crystal structures: understanding extended and local environments in proton-conducting Sc-substituted BaTiO3 perovskites
Abstract : Proton conducting ceramics are very promising for applications concerned with energy sourcing with cleaner, safer, more abundant and cheaper alternatives to fossil fuels. These materials are still in development and advances in the field depend on a better understanding of the role of defects, their identification and location in the host framework, and the assessment of their short- and long-range dynamics and kinetics. READ MORE
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2. Vibrational and Structural Characterisation in Two Perovskite Challenges: A Density Functional Theory Study
Abstract : The modelling of perovskites using density functional theory (DFT) can sometimes be a challenge with many different states very close in energy. In particular, the tilting of the inscribed octahedron, as well as the formation of electron polarons, leads to states with energy differences in the meV range. READ MORE
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3. On hydrogen point defects in perovskite oxides
Abstract : Oxides based on the perovskite structure exhibit a surprisingly large diversity in materials properties and are found in many different applications, several related to clean energy technologies, such as solar cells, batteries and fuel cells. Many properties in materials are the result of lattice imperfections, commonly denoted \emph{defects}, and much effort is devoted to fine tuning materials properties through controlling the defects therein. READ MORE
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4. Synthesis, Structure and Proton Conduction of Substituted BaTiO3 and BaZrO3 Perovskites
Abstract : Proton conducting oxides can be beneficial as electrolyte materials in devices such as fuel cells, hydrogen sensors etc. Proton conducting fuel cells (PCFCs), utilising H2 as fuel, stand out as a promising technology for future clean energy generation. READ MORE
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5. Neutron spectroscopy and computational studies of hydride-ion dynamics in oxide- and nitride-hydride materials
Abstract : This thesis presents studies of the hydride-ion dynamics in the nitride- and oxidehydride materials Ca3CrN3H and BaTiO3-xHx (with x < 0.2). READ MORE