Browsing Institutt for materialteknologi by Issue Date
Now showing items 701-720 of 2540
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Theoretical study and mathematical modelling on the reaction rates in the SiMn-production process
(Master thesis, 2016)AbstractThe reduction rate of MnO and SiO2in the furnace stage of metallurgical silicomanganese productionhas been studied to increase the current understanding of the SiMn-alloy production process. ... -
Characterization of Aluminium Components Produced by Additive Manufacturing
(Master thesis, 2016)Additive manufacturing (AM) is a new method of manufacturing that can produce physical objects directly from CAD-models. Powder Bed Fusion (PBF) technology can produce metallic parts by selectively fusing powders layer by ... -
Mass-transport impedance at channel electrodes: Accurate and approximate solutions
(Journal article; Peer reviewed, 2016)Accurate numerical electrochemical impedance spectra at channel electrodes are obtained using commercial finite element method software. These agree with experimental measurements on the hexaammineruthenium(II/III) reversible ... -
Thin film nanoporous electrodes for the selective catalysis of oxygen in abiotically catalysed micro glucose fuel cells
(Journal article; Peer reviewed, 2016)Selective reduction of oxygen is an important property of fuel cells designed to operate in a mixed fuel environment containing both oxidizing and reducing reactants. This would be of particular importance in the design ... -
SILICON PURIFICATION THROUGH MAGNESIUM ADDITION AND ACID LEACHING
(Chapter, 2016)Silicon is the dominant material in photovoltaic devices and with regard to the PV market growth, the demand for solar grade silicon feedstock is expected to be high in the future. Although solar silicon is currently ... -
Oxygen permeation in symmetric and asymmetric La0.2Sr0.8Fe0.8Ta0.2O3-d membranes
(Journal article; Peer reviewed, 2016)La0.2Sr0.8Fe0.8Ta0.2O3 − δ (LSFT) is a mixed ionic electronic conductor (MIEC) at elevated temperatures and as such a candidate material for applications both in syn-gas synthesis and as electrodes in solid oxide fuel cells ... -
A van der Waals Density Functional Study of MoO3 and Its Oxygen Vacancies
(Journal article; Peer reviewed, 2016)The electronic structure of layered molybdenum trioxide MoO3 is highly sensitive to changes in oxygen stoichiometry as Mo6+ has an empty 4d shell. Applications of MoO3 are responsive to small changes in vacancy concentration, ... -
Electrochemical characterization of YMnO3 in alkaline solution - Identifying the characteristic voltammogram and developing the experimental procedure
(Master thesis, 2016)Electrochemical intercalation of oxygen into oxide structures has been studied ever since it was first observed in 1990. A recent paper investigated using electrochemical intercalation of oxygen into vacancies in LaMnO3 ... -
Formation of {11-21} twin boundaries in titanium by kinking mechanism through accumulative dislocation slip
(Journal article; Peer reviewed, 2016)The twinning behavior and kinking behavior of a commercial purity Ti subjected to room temperature dynamic plastic deformation (DPD) has been studied. Three types of deformation twins, {1012}, {1122} and {1121}, have been ... -
Modified Pechini Synthesis of Oxide Powders and Thin Films
(Handbook of Sol-Gel Science and Technology;, Chapter; Peer reviewed, 2016)The modified Pechini method has become one of the most popular synthesis methods for complex oxide materials due to its simplicity and versatility. The method can be applied to synthesize nanocrystalline powders, bulk ... -
Optimisation of Spray Pyrolysed (La0.6Sr0.4)0.99CoO3 Cathodes for Solid Oxide Fuel Cells
(Master thesis, 2016)The effect of the precursor concentration and the concentration of citric acid (CA) on the properties of (La0.6Sr0.4)0.99CoO3 (LSC), prepared by spray pyrolysis, has been studied. Precursor solutions with concentrations ... -
Structure-Property Relations of Reduced MoO3
(Doctoral thesis at NTNU;2016:190, Doctoral thesis, 2016)Molybdenum oxide is an important component in many technological applications. Its unusually high work function coupled with its transparency make it valuable in optoelectronic devices such as photovoltaic cells and light ... -
Kinetics and Mechanism of Phase Transformations from Quartz to Cristobalite
(Master thesis, 2016)The largely debated silica polymorphism has in this thesis been investigated for the transformation from β-quartz to β-cristobalite. It is done as a step in understanding and improve the furnace operations of the silicon ... -
A TEM Study of Weakly Overaged Precipitates in AA 6082
(Master thesis, 2016)New models for modeling the material properties for aluminium alloys that can take into consideration the geometry of the needle shaped precipitates, that can be found in 6xxx alloys are being developed. The background for ... -
Behaviour of the slip-cast crucible as a contamination source during silicon directional solidification
(Master thesis, 2016)In this work the behaviour of the slip-cast crucible as a contamination source of multicrystalline silicon during directional solidification (DS) was investigated. Transport parameters of iron were estimated in two types ... -
Defect Engineering in Plasmonic Metal Oxide Nanocrystals
(Journal article; Peer reviewed, 2016)Defects may tend to make crystals interesting but they do not always improve performance. In doped metal oxide nanocrystals with localized surface plasmon resonance (LSPR), aliovalent dopants and oxygen vacancies act as ... -
Sponge-like porous manganese(II,III) oxide as a highly efficient cathode material for rechargeable magnesium ion batteries
(Journal article; Peer reviewed, 2016)Here, we are the first to report a spinel type Mn3O4 as cathode material for Mg-ion battery (MIB) with graphite foil (Gif) as current collector. High Coulombic efficiency and good cyclic stability of Mn3O4 are demonstrated, ... -
Grain boundary effect on lifetime in high performance multicrystalline silicon during solar cell processing
(Journal article; Peer reviewed, 2016)High performance multicrystalline silicon wafers used in solar cell processing have been investigated with focus on quantification of the grain boundary effect on lifetime. The lifetime of a set of 16 wafers from different ... -
Metallic Interconnects for Solid Oxide Fuel Cells: High Temperature Corrosion and Protective Spinel Coatings
(Doctoral thesis at NTNU;2016:221, Doctoral thesis, 2016)Metallic Interconnects for Solid Oxide Fuel Cells: Increasing the share of renewable energy is important in the effort to limit global warming. The challenge with increased dependence on renewable energy sources such ... -
The Influence of Transient Change in Strain Rate on Subgrain Size During Deformation by Torsion of AA6063
(Master thesis, 2016)During hot extrusion a extrusion billet s cross section is reduced, altering the metals micro- structure. As the billet is passing through the extrusion die the strain rate and temperature increases, resulting in a with a ...