Institutt for materialteknologi
Recent Submissions
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Microstructure in A356/AA6xxx after bimetallic casting with flux coating
(Journal article; Peer reviewed, 2019)This work focuses on bimetallic casting between A356 alloy melt and profiles of AA6xxx wrought aluminum alloys through a gravity casting process, with the aim to improve the component's mechanical properties. However, ... -
Reduction and Dissolution Behaviour of Manganese Slag in the Ferromanganese Process
(Journal article; Peer reviewed, 2020)The reduction and liquidus behaviour of manganese slag with different basicities were studied in non-isothermal experiments in the temperature range of 1400–1500 °C. Certain amounts of quartz were added to Assmang ore ... -
Behaviour of Aluminium Carbide in Al-melts during Re-melting
(Journal article; Peer reviewed, 2019)The presence of non-metallic inclusions in aluminium has become a more critical issue with increasing demands on surface quality and low final wall thicknesses of products. Aluminium carbide particles form during the primary ... -
A Method for Assessment of Recyclability of Aluminum from Incinerated Household Waste
(Journal article; Peer reviewed, 2019)Aluminum is widely used in daily household consumable goods such as food and drink packaging materials, storage containers, etc. The disposal of such goods into household waste means that this waste stream contains a ... -
Dynamic electrochemical impedance study of methanol oxidation at Pt at elevated temperatures
(Journal article; Peer reviewed, 2019)The methanol oxidation reaction (MOR) is studied at temperatures up to 140 °C by a combination of cyclic voltammetry, chronoamperometry, and dynamic electrochemical impedance spectroscopy (dEIS). A mechanistic analysis of ... -
In-situ observations of dislocation recovery and low angle boundary formation in deformed aluminium
(Journal article; Peer reviewed, 2019)An experimental study of the recovery of dislocations and low angle boundary formation in aluminium is presented. By combining in-situ annealing with orientation mapping in the transmission electron microscope, maps of ... -
Inside the electrode: Looking at cycling products in Li/O2 batteries
(Journal article; Peer reviewed, 2019)This work investigates the impact of electrochemical reactions and products on discharge capacity and cycling stability with electrolytes based on two common solvents – tetraethylene glycol dimethyl ether (TEGDME) and ... -
Comparing Anodic Bubble Behavior of Anodes from Anisotropic and Isotropic Cokes in Laboratory Scale Aluminum Electrolysis Cells
(Journal article; Peer reviewed, 2019)During production of aluminum in Hall-Héroult cells, carbon anodes electrochemically oxidize to form mainly CO2. The CO2 bubbles block the anode working surface during growth and coalescence, leading to cell voltage loss ... -
An EXAFS and XANES Study of V, Ni, and Fe Speciation in Cokes for Anodes Used in Aluminum Production
(Journal article; Peer reviewed, 2019)Lower-quality petroleum coke with higher levels of sulfur and metal impurities will have to be used for the manufacturing of anodes for aluminum production in the future. The sulfur and metallic impurities affect the anode ... -
Hematite microdisks as an alternative anode material for lithium-ion batteries
(Journal article; Peer reviewed, 2019)In this work, hematite microdisks (500 nm to 1 μm in diameter, ∼200 nm in thickness) have been synthesized by a facile hydrothermal method which exhibited good cycling stability at a current density of 200 mA g−1 and ... -
Co(OH)2@MnO2 nanosheet arrays as hybrid binder-free electrodes for high-performance lithium-ion batteries and supercapacitors
(Journal article; Peer reviewed, 2019)Co(OH)2@MnO2 nanosheet arrays were directly grown on nickel foam via two-step electrodeposition method with subsequent heat treatment at 170 °C. The hybrid electrode, where the electrodeposited Co(OH)2 and MnO2 nanosheets ... -
Transition Metal-Carbon Bond Enthalpies as Descriptor for the Electrochemical Stability of Transition Metal Carbides in Electrocatalytic Applications
(Journal article; Peer reviewed, 2020)Transition metal carbides are used for various applications such as hard coating, heterogeneous catalysis, catalyst support material or coatings in fuel cell applications. However, little is known about the stability of ... -
WETTABILITY OF MOLTEN Fe-Si-B ALLOY ON GRAPHITE, Al2O3, AND h-BN SUBSTRATES
(Chapter, 2019)Fe-26.38Si-9.35B alloy (numbers in mass %) is of interest as a phase change material (PCM) because it exhibits high thermal conductivity, moderate melting point, high latent heat, and low cost. This study offers valuable ... -
Understanding reaction mechanisms using dynamic electrochemical impedance spectroscopy: Methanol oxidation on Pt
(Journal article; Peer reviewed, 2019)Data from a combined cyclic voltammetry and dynamic electrochemical impedance spectroscopy (dEIS) study of the methanol oxidation reaction (MOR) at high temperatures was revisited using a new method for mechanistic modeling. ... -
Pure and Zr-doped YMnO3+δ as a YSZ-compatible SOFC cathode: a combined computational and experimental approach
(Journal article; Peer reviewed, 2019)A thorough study of the Y1−xZrxMnO3+δ series is presented with the objective to use these materials as SOFC cathodes. These pure and Zr-doped yttrium manganites exhibit a layered hexagonal structure similar to a peculiar ... -
Measuring the thermal conductivity of membrane and porous transport layer in proton and anion exchange membrane water electrolyzers for temperature distribution modeling
(Journal article; Peer reviewed, 2019)Water electrolyzers that use a membrane electrolyte between the electrodes are a promising technology towards mass production of renewable hydrogen. High power setups produce a lot of heat which has to be transported through ... -
The interaction between vacancies and twin walls, junctions, and kinks, and their mechanical properties in ferroelastic materials
(Journal article; Peer reviewed, 2019)Vacancies strongly interact with twin boundaries and often change dramatically the properties of the ferroelastic material. However, the understanding of this behavior at an atomic-level is still deficient. Here we study ... -
Local structural coupling of A- and B-site disorder in perovskite bismuth-based piezoelectrics
(Journal article; Peer reviewed, 2019)The local and average structure of (1-x)Bi0.5K0.5TiO3-xBiFeO3 (BKT-xBFO, x = 0.25 and 0.5) solid solutions are studied by synchrotron X-ray total scattering from ambient to 773 K. Pair distribution functions (PDFs) demonstrate ... -
FIB lift-out of conducting ferroelectric domain walls in hexagonal manganites
(Journal article; Peer reviewed, 2019)A focused ion beam (FIB) methodology is developed to lift out suitable specimens containing charged domain walls in improper ferroelectric ErMnO3. The FIB procedure allows for extracting domain wall sections with well-defined ... -
Understanding reaction mechanisms using dynamic electrochemical impedance spectroscopy: Methanol oxidation on Pt
(Journal article; Peer reviewed, 2019)Data from a combined cyclic voltammetry and dynamic electrochemical impedance spectroscopy (dEIS) study of the methanol oxidation reaction (MOR) at high temperatures was revisited using a new method for mechanistic modeling. ...
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