Blar i Institutt for materialteknologi på utgivelsesdato
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Properties of multicrystalline silicon wafers and case study of PV module viability analysis
(Master thesis, 2017)Multicrystalline silicon solar cells are becoming a major stream technology. The main reason is the increase of efficiency of solar cells and constant production costs decline. In some countries PV can directly compete ... -
Nonlinear mechanical behaviour of Ba0.5Sr0.5Co0.8Fe0.2O3 − δ and in situ stress dependent synchrotron X-ray diffraction study
(Journal article; Peer reviewed, 2017)Perovskite type Ba0.5Sr0.5Co0.8Fe0.2O3 − δ ceramics display nonlinear stress-strain behaviour upon uniaxial compression at room temperature. Step functional loading experiments show that the nonlinear strain response of ... -
Generator-Sensor Impedance at Double Channel Electrodes
(Journal article; Peer reviewed, 2017)A method for measuring downstream concentration effects through electrochemical impedance spectroscopy at double channel electrodes is demonstrated. An ac current perturbation is applied at an upstream working electrode ... -
Cation Nonstoichiometry of La2CoO4
(Master thesis, 2017)In this thesis, the cation nonstoichiometry and composition range of the La2CoO4 phase in the La-Co-O system were investigated and compared to earlier studies. There is a controversy over the cation nonstoichiometry of ... -
Development and Characterization of Surface Passivation Materials on Silicon Wafers for Solar Cells
(Doctoral theses at NTNU;2017:53, Doctoral thesis, 2017)A main challenge for high efficiency crystalline silicon solar cells is to reduce the current and voltage loss from the surface recombination process. An effective surface passivation system is needed to obtain high ... -
Preparation of (La0.8Sr0.2)0.995CoO3-based Inks for Ink-Jet Printing of Thin Films in Solid Oxide Fuel Cells (SOFCs)
(Master thesis, 2017)Lanthanum Strontium Cobalt oxide (LSC) is a mixed ionic-electronic conductor (MIEC) ceramic suited for use as cathode material in Solid Oxide Fuel Cells (SOFCs). Extensive research is conducted on producing the cathode in ... -
Master Slag Production for the Recovery of Rare Earth Elements
(Master thesis, 2017)The Rare Earth Elements (REEs) is a term describing a group of 17 elements which are critical components in many technological applications due to their magnetic or optical properties. In contrast to the name, these elements ... -
Influence of phosphorus on current efficiency in aluminum electrolysis at different current densities
(Journal article; Peer reviewed, 2017)Many factors may contribute to loss of current efficiency (CE) in aluminum reduction and one of them is a presence of impurities. In this work, the effect of phosphorus on CE is studied in a laboratory cell at different ... -
Electrochemical Behaviour of Industrial IrO2-Ta2O5 Anodes for Copper Electrowinning
(Journal article; Peer reviewed, 2017)In this work, industrial IrO2-Ta2O5 anodes calcined at different temperatures were investigated. The results show that the calcination temperature has significant influence on the surface microstructure including the ... -
Atomistic details of precipitates in lean Al–Mg–Si alloys with trace additions of Ag and Ge studied by HAADF-STEM and DFT
(Journal article, 2017)Bonding energies and volume misfits for alloying elements and vacancies in multicomponent Al–Mg–Si alloys have been calculated using density functional theory (DFT). A detailed atomic scale analysis has been done for ... -
Porosity Reduction and Characterization of Aluminium Components Produced by Additive Manufacturing
(Master thesis, 2017)Selective laser melting (SLM) is a relatively novel method used to produce metallic parts directly from computer models by selectively fusing metallic powder. The production is fundamentally different from traditional ... -
The effect of iron and the precipitation behavior of iron during annealing of a cold deformed commercial purity aluminium alloy
(Journal article; Peer reviewed, 2017)Iron is always present in any aluminium alloy and usually as an impurity element. In commercial purity alloys the concentration of iron is typically so large that iron has a strong influence on the material properties, due ... -
Experimental Investigation of Zinc Antimonide Thin Film Thermoelectric Element over Wide Range of Operating Conditions
(Journal article, 2017)Zinc antimonide compounds are among the most efficient thermoelectric (TE) materials with exceptional low thermal conductivity at moderate temperatures up to 350 °C. This study aims to evaluate the performance of a zinc ... -
Facile Preparation of Layered Ni(OH)2/Graphene Composite from Expanded Graphite
(Journal article; Peer reviewed, 2017)A layered Ni(OH)2/graphene composite was firstly prepared by electrochemical deposition of nickel nanoparticles between layers of expanded graphite in Ni2+ containing solution, and then the deposited nickel nanoparticles ... -
Facile synthesis of high-performance Ni(OH)2/expanded graphite electrodes for asymmetric supercapacitors
(Journal article, 2017)Cost-effective commercial expanded graphite (EG) was used as a raw material, and a facile in-situ electrodeposition method was adopted to synthesize a layered Ni(OH)2/EG composite electrode in an N,N-dimethylformamide-water ... -
Impurity control in high performance multicrystalline silicon
(Journal article; Peer reviewed, 2017)We report results from a national project about impurities in high performance multicrystalline silicon: Contamination sources, transport routes, interaction with crystal defects and impact on solar cell efficiency parameters. ... -
Tracer diffusion of 96Zr and 134Ba in polycrystalline BaZrO3
(Journal article; Peer reviewed, 2017)Cation tracer diffusion in polycrystalline cubic BaZrO3 perovskites was studied using the stable isotopes 134Ba and 96Zr in air at 1015–1200 and 1300–1500 °C, respectively. Thin films of 134BaO and 96ZrO2 were deposited ... -
Magnetic domain configuration of (111)-oriented LaFeO3 epitaxial thin films
(Journal article; Peer reviewed, 2017)In antiferromagnetic spintronics control of the domains and corresponding spin axis orientation is crucial for devices. Here we investigate the antiferromagnetic axis in (111)-oriented LaFeO3/SrTiO3, which is coupled to ... -
Predictive modeling of glass forming ability in the Fe-Nb-B system using the CALPHAD approach
(Journal article, 2017)Accurate values needed for the most commonly used indicators of good Glass Forming Ability (GFA) in alloys, i.e. the liquidus (Tl), crystallization (Tx) and glass transition (Tg) temperatures, are only available after ... -
Evaluating the tensile properties of aluminum foundry alloys through reference castings - A review
(Journal article; Peer reviewed, 2017)The tensile properties of an alloy can be exploited if detrimental defects and imperfections of the casting are minimized and the microstructural characteristics are optimized through several strategies that involve die ...