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Oxidative Ladle Refining of Metallurgical Grade Silicon: Refining of Ca and Al Impurities
(Doctoral theses at NTNU;2021:277, Doctoral thesis, 2021)English summary Metallurgical grade silicon (MG-Si) is used as an alloying agent, raw material, or as a precursor compound, in the production of aluminum alloys, silicones, photovoltaics, and electronics. Access to ... -
Oxidative Refining of Metallurgical Grade Silicon: Lab-Scale Measurements on the Overarching Refining Behavior of Ca and Al
(Peer reviewed; Journal article, 2022)Oxidative ladle refining (OLR) is the most widely used refining process for removal of dissolved Ca and Al in the industrial production of metallurgical grade silicon (MG-Si). Refining occurs by purging the silicon alloy ... -
Oxide Hydrogen Interaction and Porosity Development in Al-Si Foundry Alloys
(Master thesis, 2011)The oxide level of an A356 aluminium alloy will be controlled by (i) melting, casting and remelting A356 aluminium alloy for increasing the bi-films levels in the melt, and by (ii) additions of an extruded aluminium oxide ... -
Oxide Sensor Measurements and Simultaneous Optical Observations During Dissolution of Alumina in Cryolite Melt
(Journal article; Peer reviewed, 2022) -
Oxide – organic heterostructures: a case study of charge displacement absence at a SnO2 – copper phthalocyanine buried interface
(Journal article; Peer reviewed, 2018)Reduced tin dioxide/copper phthalocyanine (SnOx/CuPc) heterojunctions recently gained much attention in hybrid electronics due to their defect structure, allowing tuning of the electronic properties at the interface towards ... -
Oxygen absorption in hexagonal manganites
(Doctoral theses at NTNU;2023:192, Doctoral thesis, 2023)Oxygen is one of the worlds most used chemicals, with over 100 million tons of pure O2 being used for industrial and medical purposes each year. The demand for O2 is high, and expected to rise even further due to its ... -
Oxygen Absorption in Nanocrystalline h-RMnO<inf>3</inf> (R = Y, Ho, Dy) and the Effect of Ti Donor Doping
(Journal article; Peer reviewed, 2023) -
Oxygen evolution on La1-xSrxCoO3 Pellet-Electrodes in alkaline Solution: Charge Carrier density dependence of electrocatalytic activity
(Master thesis, 2012)Alkaline water electrolysis need a catalyst with low overpotential and high current densitiy for oxygen evolution in order to be a commercial viable hydrogen source in the future. Finding and establishing a correlation ... -
Oxygen Incorporation and Release in Metastable Bixbyite V2O3 Nanocrystals
(Journal article, 2016)A new, metastable polymorph of V2O3 with a bixbyite structure was recently stabilized in colloidal nanocrystal form. Here, we report the reversible incorporation of oxygen in this material, which can be controlled by varying ... -
Oxygen Non-Stoichiometry and Electrical Conductivity of La0.2Sr0.8Fe0.8B0.2O3 − δ, B = Fe, Ti, Ta
(Journal article; Peer reviewed, 2014)The oxygen non-stoichiometry was determined by coulometric titration for the perovskite oxides La0.2Sr0.8FeO3 − δ and La0.2Sr0.8Fe0.8B0.2O3 − δ (B = Ti4 + and Ta5 +) in the temperature range 600 °C ⩽ T ⩽ 900 °C and the ... -
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 ... -
Oxygen stoichiometry and transport properties of cerium niobate
(Journal article; Peer reviewed, 2008)CeNbO4 + δ has been synthesized by both solid state and wet chemical routes and characterized with respect to electrical conductivity and oxygen stoichiometry between 900 °C and 1100 °C and pO2 from 1 bar to 0.002 bar. ... -
Oxygen vacancies in the bulk and at neutral domain walls in hexagonal YMnO3
(Journal article; Peer reviewed, 2018)We use density functional calculations to investigate the accommodation and migration of oxygen vacancies in bulk hexagonal YMnO3, and to study interactions between neutral ferroelectric domain walls and oxygen vacancies. ... -
P removal from Si by Si-Ca-Al alloying-leaching refining: Effect of Al and the CaAl2Si2 phase
(Peer reviewed; Journal article, 2021)Phosphorus (P) is a critical impurity in metallurgical-grade Si that needed to be removed for solar-grade Si production. The Si-Ca-Al-P system is one of the most crucial alloy systems for Si refining, where P can be separated ... -
PAH emissions from the metallurgical industry
(Doctoral theses at NTNU;2023:269, Doctoral thesis, 2023)Polycyclic aromatic hydrocarbons (PAHs) are a large group of organic molecules consisting of two or more fused aromatic rings. They can be created by incomplete combustion of organic materials and accumulate in nature. As ... -
Parameter Optimization of Mini 3D Printer for Additive Manufacturing of Hypereutectic Aluminum Silicon Alloys
(Master thesis, 2023)Denne oppgaven vil undersøke det stadig voksende feltet med additive produksjonsmetoder (AM) som brukes i produksjonen av komplekse tredimensjonale metallkomponenter. Det har spesielt vært en økning i interessen fra ulike ... -
Parameters Affecting Softening and Melting of Quartz
(Master thesis, 2016)The aim of this work was to develop and improve a new method for investigating how different parameters affect the softening and melting of quartz. The method should give quantitative results. Quartz is the stable phase ... -
Parameters Contributing to the Formation of NOx in the Silicon Furnace: The effect of the charging frequency and raw material composition on the formation of NO
(Master thesis, 2013)NOx is a harmful gas emitted primarily by the transport industry, agriculture and petroleum industry. The emissions contribute to acid rain and global warming. The gas also has certain health risks; when exposed to NO-based ... -
PARAMETRIC OPTIMISATION OF FRICTION STIR WELDING ON ALUMINIUM ALLOY (EN AW-1100) PLATES
(Peer reviewed; Journal article, 2023)Friction stir welding is a solid-state welding process used extensively for aluminium alloys. EN AW-1100 alloy is mostly used for its exceptional corrosion resistance, high ductility, high thermal and electrical conductivities, ... -
Parametric Study of Molten Aluminium Oxidation in Relation to Dross Formation at Laboratory and Industrial Scale
(Doctoral theses at NTNU, 2022:341, Doctoral thesis, 2022)Aluminium (Al) white dross, classified as a hazardous waste, is a heterogeneous mixture of metallic Al, oxides, and non-metallic compounds (NMC) originating from the primary production route of Al. Over the past few decades, ...