Search for dissertations about: "Conductivity jump"
Showing result 1 - 5 of 7 swedish dissertations containing the words Conductivity jump.
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1. Two Problems in non-linear PDE’s with Phase Transitions
Abstract : This thesis is in the field of non-linear partial differential equations (PDE), focusing on problems which show some type of phase-transition. A single phase Hele-Shaw flow models a Newtoninan fluid which is being injected in the space between two narrowly separated parallel planes. READ MORE
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2. 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
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3. Intermediate Temperature Solid Ionic Conductors and Fuel Cells
Abstract : Novel solid proton conductors based on oxyacid salts and salt-ceramic composites and intermediate temperature fuel cells have been developed in this thesis work. The discovery of proton conduction in these materials introduces a new concept of proton conductors and starts a new research field - Intermediate Temperature Solid Proton Conductors and Fuel Cells. READ MORE
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4. Hydrogen in oxides: a density-functional study of thermodynamic and kinetic aspects
Abstract : Many solid oxides, especially those possessing a perovskite structure, exhibit significant proton conductivity when being acceptor doped and placed in hydrogen-containing atmospheres. Consequently, they have attracted attention foruse as solid membranes in electrochemical devices such as gas sensors, steam electrolyzers and fuel cells. READ MORE
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5. Dynamical properties of metal halide and oxyhydride perovskites
Abstract : This thesis concerns investigations on the dynamical properties of two classes of energy-relevant materials, namely metal halide and oxyhydride perovskites, using neutron scattering techniques. These two classes of materials share the same aspect of a perovskite-type crystal structure but are different in terms of their functional properties and concomitant promise for various technological applications. READ MORE