Browsing Institutt for materialteknologi by Title
Now showing items 156-175 of 2572
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Assessment of feature engineering and long short-term memory for structure loss identification from process data in monocrystalline silicon growth by the Czochralski method
(Research report, 2019)Structure loss impairs the quality of monocrystalline ingots and represents a major productivity loss for crystal growers. If structure loss could be predicted in advance it could help reduce the lost production time or ... -
Assessment of the Recombination Resistance in Dye-Sensitized Solar Cells by Photoelectrochemical Techniques
(Master thesis, 2019)En fargestoffbasert solcelle utnytter et fargestoff med et passende båndgap til å eksitere elektroner inn i en halvleder med et høyt båndgap. Transporten av de positive ladningene foregår gjennom en elektrolytt. Denne måten ... -
Assessment of the Thermodynamic Stability of Thermal Insulating Materials in Aluminium Electrolysis Cells
(Journal article, 2016)The cathode bottom lining in aluminium electrolysis cells serves as a thermal insulating barrier and is important for the overall thermal and dimensional stability of the cell. The thermal insulation layer ... -
Asymmetric supported dense lanthanum tungstate membranes
(Journal article; Peer reviewed, 2014)In this work, a colloidal processing route for dense asymmetric La28-xW4+xO54+3x/2 membranes for hydrogen gas separation applications was established. Dip coating process conditions were optimized to obtain ≈20 m thick ... -
Atmosphere controlled conductivity and Maxwell-Wagner relaxation in Bi0.5K0.5TiO3 – BiFeO3 ceramics
(Journal article; Peer reviewed, 2014)Here, we report on a giant dielectric relaxation in (1 x)Bi0.5K0.5TiO3—xBiFeO3 ceramics below 300 C, which becomes more pronounced with increasing BiFeO3 content. The relaxation was shown to be of Maxwell-Wagner type ... -
Atom probe tomography investigations of aging of Al-Zn-Mg(-Cu) alloys during room temperature storage or by cyclic plasticity
(Doctoral theses at NTNU;2022:369, Doctoral thesis, 2022)Aluminum alloys containing zinc, magnesium, and copper attain strength by forming nanoparticles during thermal treatments. To generate particles by precipitation, first the alloy has to be heated to about 480°C to dissolve ... -
Atomic Layer Deposition of Titanium Oxide-Based Films for Semiconductor Applications—Effects of Precursor and Operating Conditions
(Journal article, 2023)Two widely used atomic layer deposition precursors, Tetrakis (dimethylamido) titanium (TDMA-Ti) and titanium tetrachloride (TiCl4), were investigated for use in the deposition of TiOx-based thin films as a passivating ... -
Atomic level bonding mechanism in steel/aluminum joints produced by cold pressure welding
(Journal article, 2019)Cold pressure welding of aluminum alloys and steels offers an attractive, cost-effective opportunity of joining the two most important structural materials. Aim of this work is to investigate the bonding mechanism between ... -
Atomic origins of dendrite formation on alkali and earthalkali metal surfaces
(Doctoral theses at NTNU;2021:313, Doctoral thesis, 2021)"The Li-ion rechargeable battery has been paramount in the on-going transition from a fossil- to a renewable energy-based society, but the state-of-the art Li-ion battery with a graphite anode is approaching its limit with ... -
Atomic Structure of Hardening Precipitates in Al-Mg-Si Alloys: Influence of Minor Additions of Cu and Zn
(Peer reviewed; Journal article, 2023)Shifting toward sustainability and low carbon emission necessitates recycling. Aluminum alloys can be recycled from postconsumer scrap with approximately 5% of the energy needed to produce the same amount of primary alloys. ... -
Atomic structures of precipitates in Al–Mg–Si alloys with small additions of other elements
(Journal article; Peer reviewed, 2018)In Al–Mg–Si alloys, additions of only a few weight percent of Mg and Si enable formation of hardening precipitates during heat treatment. The precipitation is complex and is influenced by chemical compositions and ... -
Atomic-scale 3D imaging of individual dopant atoms in an oxide semiconductor
(Peer reviewed; Journal article, 2022)The physical properties of semiconductors are controlled by chemical doping. In oxide semiconductors, small variations in the density of dopant atoms can completely change the local electric and magnetic responses caused ... -
Atomistic approach to simulate kink migration and kink-pair formation in silicon: The kinetic activation-relaxation technique
(Journal article; Peer reviewed, 2019)The energy conversion efficiency of solar cells based on multicrystalline silicon is greatly deteriorated by dislocations. However, an in-depth understanding on the dislocation motion dynamics down to atomic scale is still ... -
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 ... -
Atomistic modelling of Fe-Al and α-AlFeSi intermetallic compound interfaces
(Doctoral theses at NTNU;2020:86, Doctoral thesis, 2020)The joining of aluminum and steel has been considered an efficient solution for building light-weight technology, particularly in the automotive, aerospace and shipbuilding industries. It is an immense challenge to join ... -
Automated Metal Cleanliness Analyzer (AMCA) – An Alternative Assessment of Metal Cleanliness in Aluminum Melts
(Peer reviewed; Journal article, 2021)The established industry standards for assessing the cleanliness of aluminum melts are PoDFA (Porous Disc Filtration Apparatus) and LiMCA (Liquid Metal Cleanliness Analyzer) analyses. PoDFA provides the necessary qualitative ... -
Automatisert sanntidsmålesystem av borevæskeparametere
(Bachelor thesis, 2021)Borevæsker brukes i alle boreoperasjoner i olje- og gassindustrien. Borevæsken bidrar til at boreoperasjonen gjennomføres på en trygg og vellykket måte. Borevæskens hovedfunksjoner er å smøre borekronen, transportere ... -
Autopsy of refractory lining in anode kilns with open and closed design
(Journal article, 2018)Aluminosilicate refractory lining constitutes a major part of anode baking kilns, and during anode baking the lining is exposed to harsh conditions which limits the lifetime. Here, autopsies of refractory linings from both ... -
Avaliação experimental e simulação computacional da dissolução de partículas de cloreto de sódio em salmoura em escoamento
(Journal article; Peer reviewed, 2014)A mathematical model to predict the dissolution of salt particles suspended in a brine flow is provided. The model consists of a system of three partial differential equations (PDE) based on mass conservation of salt ... -
Azobenzene-based self-assembled monolayer modified gold electrodes: Thioacetate suppresses, thiole enhances perchlorate adsorption
(Journal article; Peer reviewed, 2022)