Browsing Institutt for materialteknologi by Issue Date
Now showing items 621-640 of 2540
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Cathode Wear Based on Autopsy of a Shutdown Aluminium Electrolysis Cell
(Journal article; Peer reviewed, 2016)To investigate cathode wear, an autopsy of a shutdown aluminium electrolysis cell was conducted. The original lining consisted of a fully impregnated and graphitized carbon block and the cell was shut down after 2461 days ... -
Alternative Li-ion Cathodes based on Transition Metal Orthosilicates
(Doctoral thesis at NTNU;2016:57, Doctoral thesis, 2016)The aspiration of today’s society to become independent from crude oil and nuclear power led to a rapid growth of renewable energy production. Unfortunately, the majority of these energy sources are discontinuous and require ... -
Barrier Oxide Growth and Dissolution on Aluminium in Aqueous Media
(Doctoral theses at NTNU;2016:326, Doctoral thesis, 2016)The oxide formed during anodization of aluminium has been a subject of attention since the beginning of the 20th century, due to its protective properties. The oxide consists of two layers, a dense layer adjacent to the ... -
Electrical conductivity and ferroelastic properties of Ti-substituted solid solutions (1-x) BiFeO3 – x Bi0.5K0.5TiO3
(Journal article; Peer reviewed, 2016)The high crystallographic strain and polarization of BiFeO3 are attractive, but utilization of bulk BiFeO3 has been hindered by large leakage current and high coercive field. Here, we report on the electrical conductivity ... -
Electrochemical Characterisation of Carbon-Supported Ru@Pt Core-Shell Catalyst for the Direct-Methanol Fuel Cell
(Doctoral thesis at NTNU;2016:173, Doctoral thesis, 2016)The world is in an energy transition period, going from predominantly fossil fuel energy sources to more renewable sources. This is especially happening in the transportation sector, where oil is the dominant source. ... -
Influence of Artificial Porosity on Piezoelectric Behavior of (K,Na)NbO3 (KNN) Bulk Ceramics
(Master thesis, 2016)The influence of artificial porosity on the piezoelectric behaviour of KNN was studied for possible biomedical applications. A "piezoelectric effect" observed in bone is expected to trigger bone growth and healing. Therefore, ... -
A study on commercial SiC-powders sintered by hot pressing
(Master thesis, 2016)Hot-pressing of a commercial silicon carbide powder was performed with 0, 5 and 10wt% added hexagonal boron nitride. Density, microstructural and compositional development has been studied ex situ with different holding ... -
First-Principles Calculations of Oxygen Vacancy Formation in Epitaxially Strained La1-xCaxMnO3
(Master thesis, 2016)Using epitaxial strain as a degree of freedom is a promising way to tailor the properties in thin films of transition metal oxides. Since the ground state of such materials tend to have many competing low-energy states ... -
Mass Transfer Coefficients and Bubble Sizes in Oxidative Ladle Refining of Silicon
(Master thesis, 2016)The mass transfer of [Al] and [Ca] between three synthetic SiO_{2}-CaO-Al_{2}O_{3} slags, and 8N silicon, has been investigated to find the overall mass transfer coefficient k_{i,t} for the individual species. Samples were ... -
BORON REMOVAL FROM SILICON USING GAS REFINING AND DIFFERENT CRUCIBLE MATERIALS
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Piezoelectricity and rotostriction through polar and non-polar coupled instabilities in bismuth-based piezoceramics
(Peer reviewed; Journal article, 2016)Coupling of order parameters provides a means to tune functionality in advanced materials including multiferroics, superconductors, and ionic conductors. We demonstrate that the response of a frustrated ferroelectric state ... -
Luminescent Eu3+-doped NaLa(WO4)(MoO4) and Ba2CaMoO6 prepared by the modified Pechini method
(Journal article; Peer reviewed, 2016)Modified Pechini synthesis routes were developed for synthesis of the novel red phosphor materials NaLa(WO4)(MoO4):Eu3+ and Ba2CaMoO6:Eu3+. Phase pure NaLa(WO4)(MoO4):Eu3+ was obtained at calcination temperatures ≥600 °C ... -
High-throughput computational screening of nanoporous adsorbents for CO 2 capture from natural gas
(Journal article; Peer reviewed, 2016)With the growth of natural gas as an energy source, upgrading CO2-contaminated supplies has become increasingly important. Here we develop a single metric that captures how well an adsorbent performs the separation of CH4 ... -
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 ... -
The Effect of Production Parameters on the Performance of Carbon Anodes for Aluminium Production
(Doctoral thesis at NTNU;2016:108, Doctoral thesis, 2016)Carbon anodes are essential when producing aluminium. Oxygen from dissolved aluminium oxide reacts electrochemically on the carbon anode forming CO2. The carbon anode is consumed during the process. The production of ... -
Sustainability in alumina production from bauxite
(Chapter, 2016)Alumina (Al2O3) is the main material used for the aluminum production, which is originated from bauxite ore through hydrothermal processes. Although bauxite conversion to alumina can be done through a few competitive ... -
N-type Czochralski silicon solidification: Oxygen- and copper-related defects formation
(Doctoral thesis at NTNU;2016:68, Doctoral thesis, 2016)This PhD work was focused on the formation of oxygen- and copper-related defects in ntype Czochralski silicon for solar cells. These defects are a very important source of material and solar cell performance degradation, ... -
Conductive Coatings for Metal Bipolar Plates in Proton Exchange Membrane Water Electrolyzers
(Master thesis, 2016)Due to the use of expensive materials, only 4 % of hydrogen production today is from water electrolysis. The most efficient low-temperature electrolyzer is the proton exchange membrane electrolyzer (PEMWE), where the bipolar ... -
New Materials for Mg-ion batteries - Mn3O4 as cathode
(Master thesis, 2016)Due to drawbacks with the lithium ion battery technology, magnesium ion batteries are being researched as an alternative replacement system. An optimal combination of component materials has however not been discovered ... -
Flame-made Lithium Transition Metal Orthosilicates
(Journal article; Peer reviewed, 2016)Li2MSiO4 (M = Fe, Mn, Co) compounds have since their discovery gained increased attention as alternative, inexpensive and inherently safe positive electrodes for Li-ion batteries. To meet the required performance for an ...