Blar i Institutt for materialteknologi på tittel

Viser treff 1334-1353 av 2498

    • Liquidus relations and thermochemistry within the system Fe-Mn-C-O 

      Fenstad, Jo (Dr. ingeniøravhandling, 0809-103X; 2000:126, Doctoral thesis, 2000)
      The ever-growing competition in the bulk material industry is increasingly a battle between branches of materials producers rather than within each branch. In this climate, an enduring competitiveness relies on continous ...

    • Liquinert quartz crucible - Removal of OH groups in silica crucibles to reduce wetting between the crucible and the silicon melt 

      Strømmen, Mathias (Master thesis, 2018)
      When producing monocrystalline silicon ingots for the solar cell industry quartz crucibles are most commonly used. A quartz crucible used in the Czochralski (CZ) process will be used to pull ingots for more than 100 hours. ...

    • Literature review on Nitrosamines – Formation, Health and Environmental Impact and the Ways of Monitoring and Analysis 

      Smalberget, Kristin (Bachelor thesis, 2021)
      International Agency for Research on Cancer (IARC) har klassifisert mer enn 10 nitrosaminer som kreftfremkallende, sannsynligvis eller muligens kreftfremkallende for mennesker. Sekundære nitrosaminer er stabile forbindelser ...

    • Lithium bis (fluorosulfonyl) imide as electrolyte salt for high-content silicon-based anodes for Li-ion batterier 

      Asheim, Karina (Doctoral theses at NTNU;2021:413, Doctoral thesis, 2021)
      Li-ion batteries have become the superior rechargeable battery technology due to high energy density, long cycle life, safety and cost. Several materials can be used for the electrodes and the electrolyte, enabling ...

    • Lithium cations mobility in a coarse-grained polymer embedded with Lennard Jones particles using non-equilibrium molecular dynamics 

      Zhao, Anqi (Master thesis, 2022)
      Kompositt faststoffelektrolytter er lovende alternativer til de eksisterende flytende elektrolyttene i litium-batterier fordi de kan brukes med litium-metall som anode. Hovedproblemet med slike polymer-baserte faste ...

    • Lithium dendrites in solid-state batteries - Where they come from and how to mitigate them 

      Flatscher, Florian (Doctoral theses at NTNU;2023:382, Doctoral thesis, 2023)
      A major contributor to global CO2 emissions is transportation and a transition to electric vehicles could lead to a significant reduction of those emissions. A roadblock in this transition are safety issues of electric ...

    • Local and average structure of Mn- and La-substituted BiFeO3 

      Jiang, Bo; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2017)
      The local and average structure of solid solutions of the multiferroic perovskite BiFeO3 is investigated by synchrotron X-ray diffraction (XRD) and electron density functional theory (DFT) calculations. The average ...

    • Local control of improper ferroelectric domains in YMnO 3 

      Kuerten, Lukas; Krohns, Stephan; Schoenherr, Peggy; Holeczek, Katharina; Pomjakushina, Ekaterina; Lottermoser, Thomas; Trassin, Morgan; Meier, Dennis Gerhard; Fiebig, Manfred (Peer reviewed; Journal article, 2020)
      Improper ferroelectrics are described by two order parameters: a primary one, driving a transition to long-range distortive, magnetic, or otherwise nonelectric order, and the electric polarization, which is induced by the ...

    • Local dynamics of topological magnetic defects in the itinerant helimagnet FeGe 

      Dussaux, Antoine; Schoenherr, Peggy; Koumpouras, Konstantinos; Chico, Jonathan; Chang, Kevin; Lorenzelli, Luca; Kanazawa, Naoya; Tokura, Yoshinori; Garst, Markus; Bergman, Anders; Degen, Christian L.; Meier, Dennis (Journal article; Peer reviewed, 2016)
      Chiral magnetic interactions induce complex spin textures including helical and conical spin spirals, as well as particle-like objects such as magnetic skyrmions and merons. These spin textures are the basis for innovative ...

    • Local electric-field control of multiferroic spin-spiral domains in TbMnO3 

      Schoenherr, Peggy; Manz, Sebastian; Kuerten, Lukas; Shapovalov, Konstantin; Iyama, Ayato; Kimura, Tsuyoshi; Fiebig, Manfred; Meier, Dennis Gerhard (Journal article, 2020)
      Spin-spiral multiferroics exhibit a magnetoelectric coupling effects, leading to the formation of hybrid domains with inseparably entangled ferroelectric and antiferromagnetic order parameters. Due to this strong magnetoelectric ...

    • Local structural coupling of A- and B-site disorder in perovskite bismuth-based piezoelectrics 

      Jiang, Bo; Lin, De-Ye; Grande, Tor; Selbach, Sverre Magnus (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 ...

    • Local Structure of Disordered Bi0.5K0.5TiO3 Investigated by Pair Distribution Function Analysis and First-Principles Calculations 

      Jiang, Bo; Grande, Tor; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2017)
      We investigate A-site cation ordering in the ferroelectric perovskite Bi0.5K0.5TiO3 (BKT) by density functional theory (DFT) calculations and synchrotron X-ray total scattering. Using BKT as a prototypical lead-free ...

    • Local surface crystal structure fluctuation on Li, Na and Mg metal anodes 

      Røe, Ingeborg Treu; Schnell, Sondre Kvalvåg (Peer reviewed; Journal article, 2022)
      Dendrite formation occurs on Li, Na, and Mg metal anodes in rechargeable batteries, and is a safety challenge, as well as a limiting factor for increasing energy- and power density. However, the behaviour of the dendrites ...

    • Long Term Degradation of Polymers: Molecular and Macroscopic Effects 

      Berggren, Randi (Master thesis, 2013)
      Hydrolytic degradation in water at elevated temperatures is one of the most important reasons for failure in polymeric materials in offshore flexible risers. In this thesis the ageing of polyamide 11 (PA11) in deoxygenated ...

    • Long term stability testing of oxide unicouple thermoelectric modules 

      Skomedal, Gunstein; Vehus, Tore; Kanas, Nikola; Singh, Sathya Prakash; Einarsrud, Mari-Ann; Wiik, Kjell; Middleton, Peter Hugh (Journal article; Peer reviewed, 2019)
      Thermoelectric devices based on oxides are good candidates for energy harvesting technologies for use in aggressive conditions where the materials should withstand high temperatures and corrosive environments over prolonged ...

    • Long-Life, Low-Maintenance Coating Systems 

      Knudsen, Ole Øystein; Bjørgum, Astrid; Døssland, Line Teigen (Journal article; Peer reviewed, 2012)
      A coating system with low maintenance will often give lower life-cycle costs, in spite of higher costs in the new construction phase. The Public Roads Administration in Norway has been using coating systems consisting of ...

    • Long-term stability of screen-printed pseudo-reference electrodes for electrochemical biosensors 

      Søpstad, Sindre; Johannessen, Erik Andrew; Seland, Frode; Imenes, Kristin (Journal article; Peer reviewed, 2018)
      Pseudo reference electrodes forms an essential part of electrochemical transducers, where they are used to maintain a reference potential for the system. Yet, little is known about their long-term stability, and any drift ...

    • The (love & hate) role of entropy in process metallurgy 

      Tveit, Halvard; Kolbeinsen, Leiv (Journal article, 2019)
      Abstract. Process metallurgy is the basis for the production, refining and recycling of metals and is based on knowledge of transport phenomena, thermodynamics and reaction kinetics, and of their interaction in high ...

    • Low Cycle Fatigue of Extruded and Cast Aluminium Alloy 6082 

      Reinton, Tone Elise (Master thesis, 2017)
      The objective of the research is to determine the differences between the low cycle fatigue properties of an extruded and cast treatments of AA6082-T6 used as the forging billet in the production of a car suspension arm. ...

    • Low-energy properties of electrons and holes in CuFeS2 

      Brekke, Bjørnulf; Malyshev, Roman; Svenum, Ingeborg-Helene; Selbach, Sverre Magnus; Tybell, Per Thomas Martin; Brüne, Christoph; Brataas, Arne (Peer reviewed; Journal article, 2022)
      The antiferromagnetic semiconductor CuFeS2 belongs to a magnetic symmetry class that is of interest for spintronics applications. In addition, its crystal lattice is compatible with Si, making it possible to integrate it ...