Browsing Institutt for materialteknologi by Title
Now showing items 1612-1631 of 2523
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On the Direct Reduction Phenomena of Bauxite Ore Using H2 Gas in a Fixed Bed Reactor
(Peer reviewed; Journal article, 2020)The Bayer Process is the dominant industrial method to produce alumina from bauxite ore. Due to the generation of large amounts of Bauxite Residue (red mud), an alternative method, called the Pedersen Process, is of our ... -
On the Durability of Protective Titania Coatings on High-Voltage Spinel Cathodes
(Peer reviewed; Journal article, 2022)TiO2-coating of LiNi0.5-xMn1.5+xO4 (LNMO) by atomic layer deposition (ALD) has been studied as a strategy to stabilize the cathode/electrolyte interface and mitigate transition metal (TM) ion dissolution. The TiO2 coatings ... -
On the Effect of A to B Stoichiometry Variation on Conductivity and Phase Purity in 0.8BiFeO3-0.2Bi0.5K0.5TiO3: Development of Lead-Free Ferroelectric Materials
(Master thesis, 2014)Piezoelectric materials are currently widely used in both electronics and transducer applications. Today, the majority of these units are based on the lead containing material system PZT, and release of lead to the environment ... -
On the Effect of Atoms in Solid Solution on Grain Growth Kinetics
(Journal article; Peer reviewed, 2014)The discrepancy between the classical grain growth law in high purity metals (grain size D∝t1/2D∝t1/2) and experimental measurements has long been a subject of debate. It is generally believed that a time growth exponent ... -
On the effect of calcium lignosulfonate on the rheology and setting time of cement paste
(Journal article; Peer reviewed, 2017)The effect of softwood calcium lignosulfonate, LSs, on the rheology and setting time of cement paste has been investigated. Two Portland cements with different surface area and C3A content were used. The lignosulfonate was ... -
On the electrocatalytic symbiotic synergism between Pt, Ni and Al in plasma vapour deposited Pt<inf>x</inf>Ni<inf>y</inf>Al<inf>z</inf> thin metal films for water electrolysis
(Journal article; Peer reviewed, 2021)This work highlights the fact that the activity of an already active metal/surface, i.e. Ni, can be increased even further by combining it with metals/surfaces that exhibit low activity, i.e. Pt and Al, when used on their ... -
On the energetics of cation ordering in tungsten-bronze-type oxides
(Journal article; Peer reviewed, 2015)Oxides with the tetragonal tungsten bronze (TTB) structure are well-known ferroelectrics that show a large flexibility both with respect to chemical composition and cation ordering. Two of the simplest compounds in this ... -
On the formation mechanism of Ba0.85Ca0.15Zr0.1Ti0.15O3 thin films by aqueous chemical solution deposition
(Journal article; Peer reviewed, 2020)Here we report on the development of an environmentally friendly, simple and robust aqueous chemical solution route for the fabrication of Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) thin films. Using a stable aqueous precursor solution, ... -
On the influence of crystallographic texture on cyclic hardening of an AlMgSi alloy
(Peer reviewed; Journal article, 2024)The influence of crystallographic texture on hardening achieved by cyclic loading at room temperature, was tested by comparing samples from an axisymmetric round bar and a flat profile, both made of non-recrystallized, ... -
On the phosphorus evaporation from liquid silicon by Knudsen effusion mass spectrometry
(Peer reviewed; Journal article, 2022)Silicon refining for solar applications is intensively on demand, and removal of phosphorus from Si is one of the most challenging steps. Evaporation of P from liquid Si in a vacuum refining process is the most efficient ... -
On the Production of W–Fe–B Ternary Compounds by Self-propagating High-Temperature Synthesis
(Peer reviewed; Journal article, 2022)In this study, one-step production of W2FeB2 and WFeB compounds from oxide raw materials was carried out through cost-effective and energy-efficient aluminothermic self-propagating high-temperature synthesis (SHS). ... -
On the Solubility of Bi in Tetragonal Tungsten Bronzes
(Peer reviewed; Journal article, 2024)Ferroelectric Pb5Nb10O30 (PN) tetragonal tungsten bronze (TTB) forms solid solutions that exhibit morphotropic phase boundaries (MPBs). Successful replacement of PN with TTBs containing Bi could advance lead-free TTB MPBs. ... -
On the spatio-temporal characteristics of the Portevin-Le Chatelier effect in aluminium alloy AA5182: An experimental and numerical study
(Peer reviewed; Journal article, 2023)The Portevin–Le Chatelier (PLC) effect and its spatio-temporal characteristics in the aluminium alloy AA5182 are studied experimentally and numerically in the current work. An extremely high-frequency camera (up to 1000 ... -
On the Use of a Cluster Identification Method and a Statistical Approach for Analyzing Atom Probe Tomography Data for GP Zones in Al–Zn–Mg(–Cu) Alloys
(Peer reviewed; Journal article, 2023)Early-stage clustering in two Al–Mg–Zn(–Cu) alloys has been investigated using atom probe tomography and transmission electron microscopy. Cluster identification by the isoposition method and a statistical approach based ... -
On the Viability of Lithium Bis(fluorosulfonyl)imide as Electrolyte Salt for Use in Lithium-Ion Capacitors
(Peer reviewed; Journal article, 2023) -
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 ... -
One-step lipase-catalysed preparation of eslicarbazepine
(Peer reviewed; Journal article, 2016)The antiepileptic eslicarbazepine (S-licarbazepine) has been prepared in one step from its racemic form RS-licarbazepine via lipase catalysed kinetic resolution. A novel stereoselective simultaneous HPLC separations of ... -
Online monitoring of aluminium primary production gas composition by use of Fourier-transform infrared spectroscopy
(Journal article; Peer reviewed, 2014)Online monitoring of aluminium primary production raw gas is challenging due to the high concentration of HF in the presence of water. Tunable Diode Laser (TDL) analyzers retrofitted with sapphire optical windows allow for ... -
Operando studies of Mn oxide based electrocatalysts for the oxygen evolution reaction
(Peer reviewed; Journal article, 2023)Inspired by photosystem II (PS II), Mn oxide based electrocatalysts have been repeatedly investigated as catalysts for the electrochemical oxygen evolution reaction (OER), the anodic reaction in water electrolysis. However, ... -
Operational Experience and Control Strategies for a Stand-Alone Power System based on Renewable Energy and Hydrogen
(Doktoravhandlinger ved NTNU, 1503-8181; 2005:28, Doctoral thesis, 2005)The topic of this thesis is investigation of a small-scale stand-alone power system, based on both experimental work and computer simulations. The power system in this study uses solar energy as energy input, lead-acid ...