Browsing Institutt for materialteknologi by Title

Now showing items 1857-1876 of 2514

    • Quantitative mapping of nanotwin variants in the bulk 

      Schultheiss, Jan; Porz, Lukas; Kodumudi Venkataraman, Lalitha; Höfling, Marion; Yildirim, Can; Cook, Phil; Detlefs, Carsten; Gorfman, Semën; Rödel, Jürgen; Simons, Hugh (Peer reviewed; Journal article, 2021)
      Crystallographic twins are critical to the properties of numerous materials from magnesium alloys to piezoelectrics. Since the onset of the twin formation is highly sensitive to the triaxial mechanical boundary conditions, ...

    • QUANTITATIVE MINERALOGY OF HIGH PURITY QUARTZ, CASE OF SPRUCE PINE, NORTH CAROLINA 

      Manyara, Saimon Gerald (Master thesis, 2014)
      High Purity Quartz is one of the important minerals in the electronic industry today, but production of extreme high purity quartz requires a detailed knowledge of the resource from mine to the processing plant. To achieve ...

    • Quantitative study of grain refinement in Al-Mg alloy processed by equal channel angular pressing at cryogenic temperature 

      Chen, Yongjun; Roven, Hans Jørgen; Subbarayan, Sapthagireesh; Skaret, Pål Christian; Hjelen, Jarle (Journal article; Peer reviewed, 2011)
      Strain induced grain refinement of an Al–1 wt.% Mg alloy processed by equal channel angular pressing (ECAP) at cryogenic temperature is investigated quantitatively. The results show that both mean grain and subgrain sizes ...

    • Quartz Behavior in Si Production 

      Zhang, Xinhao (Master thesis, 2013)
      The results of this study show the main findings in this work. The points are summarized as follow:1.With the temperature increased, many cracks formed inside the quartz. When the temperature was approaching melting point, ...

    • Raman spectroscopy of mackinawite FeS in anodic iron sulfide corrosion products 

      Genchev, Georgi; Erbe, Andreas (Journal article; Peer reviewed, 2016)
      Raman spectroscopy in a confocal microscope was used to study electrochemically synthesized corrosion products from sour gas experiments. When exposed to oxygen-containing atmosphere, the initial mackinawite FeS corrosion ...

    • A Raman-Structure Model for the Viscosity of SiO2- CaO-Al2O3 System 

      Haghdani, Shokouh; Tangstad, Merete; Einarsrud, Kristian Etienne (Peer reviewed; Journal article, 2022)
      The relationship between structure and viscosity of molten slags is investigated using the Raman spectroscopy technique. To this end, a group of 20 synthetic slags in the SiO2-CaO-Al2O3 ternary system is considered. The ...

    • Raney-platinum thin film electrodes for the catalysis of glucose in abiotically catalyzed micro-glucose fuel cells 

      Do, Uyen Phuong; Seland, Frode; Wang, Kaiying; Johannessen, Erik Andrew (Journal article; Peer reviewed, 2019)
      Fuel cells capable of synthetic glucose catalysis have revolved around the implementation of abiotic catalysts that require extreme acid and alkaline environments. These are not compatible with implantable medical sensor ...

    • Rational design of mixed solvent and porous graphene-supported spinel oxide electrodes for high-rate and long cycle-life Mg batteries 

      Wang, Lu; Shao, Yuanlong; Jiang, Bo; Fiksdahl, Anne; Jayasayee, Kaushik (Peer reviewed; Journal article, 2019)
      The development of Mg batteries based on the interfacial charge storage mechanism, where the capacity originates from capacitive processes and the solvent-related interfacial reactions, could efficiently circumvent the ...

    • Rationalization of hydrothermal synthesis of NaNbO3 by rapid in situ time-resolved synchrotron X-ray diffraction 

      Skjærvø, Susanne Linn; Wells, Kristin Høydalsvik; Sommer, Sanna; Vu, Tuong-Dan; Tolchard, Julian R; van Beek, Wouter; Grande, Tor; Iversen, Bo B.; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2018)
      In situ monitoring of the formation of crystalline phases during conventional hydrothermal synthesis is experimentally challenging. Here, we report an in situ time-resolved synchrotron X-ray diffraction study during ...

    • Rayleigh analysis of dielectric properties in textured K0.5Na0.5NbO3 ceramics 

      Haugen, Astri Bjørnetun; Morozov, Maxim; Jones, Jacob L.; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2014)
      Grain texturing is a known method of exploiting the intrinsic dielectric and piezoelectric anisotropy in ferroelectric ceramics. However, the role of crystallographic texture on anisotropic extrinsic contributions including ...

    • Reaction kinetics for reduction of manganese ore with carbon monoxide in the presence of carbon 

      Ishak, Rodney (Dr. ingeniøravhandling, 0809-103X; 2002:135, Doctoral thesis, 2002)
      In the production of ferromanganese the gas-solid reactions taking place in the furnace shaft (the so-called pre-reduction zone, where higher manganese oxides in the manganese ore are reduced to MnO) are to a large extent ...

    • Reaction pathway of the hydrothermal synthesis of AgCuO2 from in situ time-resolved X-ray diffraction 

      Liu, hongjun; Grendal, Ola Gjønnes; Skjærvø, Susanne Linn; Dalod, Antoine Robert Marie; van Beek, Wouter; sekkat, abderrahime; Einarsrud, Mari-Ann; munoz-Rojas, David (Journal article; Peer reviewed, 2020)
      AgCuO2 is an interesting semiconductor oxide with appealing optical and electronic properties. While the oxide has been synthesized in bulk by different approaches, no study on the formation mechanism has been carried out ...

    • Reaction Rate Analysis of Manganese Ore Prereduction in CO-CO2 Atmosphere 

      Larssen, Trine Asklund; Senk, Dieter Georg; Tangstad, Merete (Peer reviewed; Journal article, 2021)
      Variations in energy efficiency and climate gas emissions in production of manganese ferroalloys are largely related to the solid-state reduction of the manganese ores used as raw material in the production. The gas-solid ...

    • Reactivity assessment of charcoal for use in silicon production 

      Ramos, D.C.; Carneiro, A.C.O.; Tangstad, Merete; Pereira, B.L.C.; Saadieh, Raghed; Oliveira, A.C.; Vital, B.R. (Peer reviewed; Journal article, 2021)
      As charcoal is used in the silicon metal process, reactivity towards SiO is one of the most important properties that has strong effects on silicon recovery. The purpose of this study was to analyze anatomical properties ...

    • Reactivity of Calcined Clays 

      Danner, Tobias (Doktoravhandlinger ved NTNU, 1503-8181; 2013:218, Doctoral thesis, 2013)
      With 3-5 billion tons cement-produced every year, the cement industry is today the third largest emitter of CO2 in the world after fossil-fuel based energy plants serving heating/cooling of buildings and combustion engines ...

    • Reactivity of Coke in Relation to Sulfur Level and Microstructure 

      Jahrsengene, Gøril; Rørvik, Stein; Ratvik, Arne Petter; Lossius, Lorentz Petter; Haverkamp, Richard G.; Svensson, Ann Mari (Journal article; Peer reviewed, 2019)
      The quality of coke materials available for anodes for the aluminium industry is changing and industrial cokes with higher impurity levels are now introduced. The cokes in the anodes must meet specifications with respect ...

    • Recent developments on manufacturing and characterization of fused quartz crucibles for monocrystalline silicon for photovoltaic applications 

      Warden, Gabriela Kazimiera; Juel, Mari; Gawel, Bartlomiej Adam; Sabatino, Marisa Di (Peer reviewed; Journal article, 2022)
      The dominating technology of solar cell production today is based on monocrystalline silicon, produced mostly by the Czochralski process. Recently, the solar cell industry, has started to move towards growing larger and ...

    • Recent trends in graphitic carbon nitride-based binary and ternary heterostructured electrodes for photoelectrochemical water splitting 

      Koutavarapu, Ravindranadh; Peera, Shaik Gouse; Lee, Tae Gwan; Myla, Chimpiri Rao; Lee, Dong-Yeon; Shim, Jaesool; Balasingam, Suresh Kannan (Journal article; Peer reviewed, 2021)
      The graphitic carbon nitride (g-C3N4) is a class of two-dimensional layered material. The ever-growing research on this fascinating material is due to its unique visible light absorption, surface, electrocatalytic, and ...

    • Recombination activity of grain boundaries in high-performance multicrystalline Si during solar cell processing 

      Krzysztof, Adamczyk; Søndenå, Rune; Stokkan, Gaute; Looney, Erin; Jensen, Mallory; Lai, Barry; Rinio, Markus; Sabatino, Marisa Di (Journal article; Peer reviewed, 2018)
      In this work, we applied internal quantum efficiency mapping to study the recombination activity of grain boundaries in High Performance Multicrystalline Silicon under different processing conditions. Wafers were divided ...

    • Recovery and Utilisation of Kerf Waste from Silicon Wafering Process 

      Lim, Kevin (Master thesis, 2018)
      While the green credentials of solar photovoltaic technology are often touted, there is still substantial room for improvement in the silicon solar photovoltaic value chain. In particular, silicon kerf which is a byproduct ...