Blar i Institutt for materialteknologi på utgivelsesdato
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Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe
(Journal article; Peer reviewed, 2016)Chiral magnetic interactions induce complex spin textures including helical and conical spin spirals, as well as particle-like objects such as magnetic skyrmions and merons. These spin textures are the basis for innovative ... -
The Effect of Donor Doping with Ti4+ on the Oxygen Absorption Properties of h-YMnO3
(Master thesis, 2016)In this thesis, the effect of donor doping with Ti4+ on the oxygen absorption properties in the hexagonal rare-earth magnanite h-YMnO3 was studied and compared to undoped compounds of the same material class. Bulk-sized ... -
The Effect of Thermal History on the Structural and Dielectric Properties of Tetragonal Tungsten Bronzes
(Master thesis, 2016)Tetragonal tungsten bronzes (TTB) are remarkable materials for their potential for chemical substitution and disorder. The niobates of this kind are usually ferroelectric, and they can comprise both ordered and disordered ... -
A physically-based constitutive model applied to AA6082 aluminium alloy at large strains, high strain rates and elevated temperatures
(Journal article; Peer reviewed, 2016)This paper presents a physically-based constitutive model applied to an AA6082 aluminium alloy subjected to large strains, high strain rates and elevated temperatures. The model accounts for thermo-elasticity, thermo-vis ... -
Experimental Study of Thermal Conductivity and Compression Measurements of the GDL-MPL Interfacial Composite Region
(Journal article, 2016)MPL and GDL in a PEM fuel cell assembly are often treated as separate layers in the literature. However, there exists a considerable interfacial region where the two different materials merge. The MPL consists of fine ... -
Impurity effect of Mg on the generalized planar fault energy of Al
(Journal article; Peer reviewed, 2016)Generalized planar fault energy (GPFE) curves are widely used to evaluate the deformation behavior of metals and alloys. In the present work, a systematic analysis of the microscopic plastic deformation mechanism of ... -
Time-dependent water uptake in a polymer model coating visualized by FTIR microscopy using a focal plane array detector
(Chapter, 2016)Progress of the delamination front during cathodic delamination was imaged by FTIR microscopy. Delamination experiments were carried out using H2O and D2O-based electrolytes. Inhomogeneous propagation of the delamination ... -
Exploring lithium ion batteries for wind powered water injection
(Master thesis, 2016)In this work, lithium ion batteries consisting of carbon-coated silica (\ce{SiO2}) anodes and various commercial cathodes were prepared, tested, and analysed for use in a novel wind-powered water injection system, designed ... -
Investigation of Sodium Sulfate Additions into Cryolite-Alumina Melts
(Journal article, 2016)In the Hall-Héroult process, sulfur impurities may not only emit harmful gases but also reduce current efficiency. To better understand this process, the behaviour of sulfur compounds in a cryolite-alumina melt at 1253 K ... -
The effect of phosphorus diffusion gettering on recombination at grain boundaries in HPMC-silicon wafers
(Journal article; Peer reviewed, 2016)The influence of phosphorus diffusion gettering on recombination at grain boundaries has been studied in a commercially cast high performance multicrystalline silicon block. Wafers from four different heights have been ... -
Kvantifisering av rest-austenitt i sveisesimulert SMSS og kontinuerlig EBSD karakterisering under in-situ strekktesting
(Master thesis, 2016)Denne oppgavene omhandler EBSD kvantifisering av rest-austenitt i sveisesimulert SMSS og utforsker i tillegg en ny metode for in-situ strekktesting hvor EBSD opptak blir gjort under kontinuerlig strekking. To ulike strategier ... -
Cathode Wear in Electrowinning of Aluminum Investigated by a Laboratory Test Cell
(Journal article; Peer reviewed, 2016)The lifetime of an aluminum electrolysis cell is mainly determined by the cathode wear, especially for high amperage cells utilizing graphitized carbon cathodes. The cathode wear mechanisms are, however, complex and still ... -
On Vanadium Substitution in Li2MnSiO4/C as Positive Electrode for Li-ion Batteries
(Journal article; Peer reviewed, 2016)Vanadium substitution is an interesting approach to manipulate the properties of the poor electronic and ionic conducting lithium transition metal orthosilicates. Especially, if incorporated on the Si site, it could alter ... -
Ferroelectric Tungsten Bronzes
(Doctoral thesis at NTNU;2016:237, Doctoral thesis, 2016)Ferroelectric materials are everywhere in the modern society, from consumer electronics to car engines. Applications cover a whole range of devices such as sensors, actuators and transducers due to their dielectric or ... -
Reduction of commercial hematite pellet in isothermal fixed bed-experiments and numerical modelling
(Journal article; Peer reviewed, 2016)In the present work, fixed bed reduction experiments were conducted at 1173 K over a range of H2/CO ratios from 0.8 to 2.0 and subsequently modelled numerically. The model consists of two one-dimensional, isothermal and ... -
Smelting-reduction of bauxite for sustainable alumina production
(Chapter, 2016)Bauxite ore is the main raw material for aluminum production, it is converted into alumina (Al2O3) to obtain a proper charge material for aluminum production in Hall-Heroult process. Bayer process is the main commercial ... -
Microstructure and Mechanical Properties of Welded AA6082 Aluminium Alloys
(Master thesis, 2016)The present work have investigated variants of an AA6082 aluminium alloy. Five different alloys with various amounts of Mn, Cr and Zr have been subjected to three homogenization procedures. After homogenization, the aluminium ... -
Surface Diffusion of Oxygen Transport Membrane Materials Studied by Grain-Boundary Grooving
(Journal article; Peer reviewed, 2016)Mass transport mechanism responsible for grain-boundary grooving during thermal annealing of polished ceramics of Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and La2NiO4+δ (LN) was revealed by atomic force microscopy. Surface diffusion ... -
Cathodic Protection of Steel-Aluminium Galvanic Couples for a New Generation of Lightweight Subsea Structures
(Master thesis, 2016)A new generation of lightweight subsea structures is planned for application in oil and gas production. Due to increasing weight of subsea installations, the use of aluminium as a structural material is of continuous ... -
Development of polymer-nanoparticle composite with high refractive index
(Master thesis, 2016)A newly developed lens technology utilizes a soft high refractive index polymer to change focus. By further increasing the refractive index of the polymer, without lowering the transmittance of visible light, the overall ...