• Quantifying the grain boundary segregation strengthening induced by post-ECAP aging in an Al-5Cu alloy 

      Jia, Hailong; Bjørge, Ruben; Cao, Lingfei; Hui, Song; Marthinsen, Knut; Li, Yanjun (Journal article, 2018)
      Hardening on annealing (HOA) has been frequently observed in nanostructured metals and alloys. For nanostructured materials obtained by severe plastic deformation (SPD), HOA has been attributed to the reduction of dislocation ...
    • 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 ...
    • 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 ...
    • 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 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 ...
    • 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 ...
    • 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 ...
    • Recovery Kinetics in High Purity and Commercial Purity Aluminium Alloys 

      Bunkholt, Sindre; Marthinsen, Knut; Nes, Erik Aasmund (Journal article, 2013)
      Motivated by improving current softening models for recycle friendly alloys, softening was investigated in high purity and commercial purity aluminium alloys. Utilizing the electron backscatter diffraction (EBSD) technique, ...
    • Recovery of molybdenum and rhenium in scrub liquors of fumes and dusts from roasting molybdenite concentrates 

      Salehi, Hossein; Tavakoli, Hamed; Aboutalebi, M.R.; Samim, H.R. (Peer reviewed; Journal article, 2019)
      The present work addresses the recovery of rhenium from scrub liquor of molybdenite concentrate roasting fume and dust by solvent extraction method. According to the results, recovery of rhenium from the scrub liquor is ...
    • Recrystallisation Behaviour in Extruded Profiles of Non-Dispersoid Containing Al-Mg-Si Alloys 

      Paulsen, Christian Oen (Master thesis, 2015)
      Hot extrusion of non-dispersoid containing aluminium alloys commonly ends with a fully or partially recrystallised grain structure. However, the recrystallisation mechanisms, whether static or dynamic (taking place during ...
    • Recrystallization and phase transformation of light metals induced by electric current flash heating 

      Wang, Shubo (Doctoral theses at NTNU;2020:186, Doctoral thesis, 2020)
      Aluminium (Al), and titanium (Ti) alloys are two commonly used light metal materials in the aerospace and automotive industry due to their high strength-to-weight ratio. Various heat treatments are applied to improve the ...
    • Recycling and Utilisation of Secondary Aluminium Products 

      Meling, Ingrid (Master thesis, 2018)
      Efficient utilisation of secondary aluminium products is increasingly important as the energy consumption and CO2 emissions are greatly reduced by recycling compared to primary production. The aim of this study was to ...
    • Recycling of Aluminium from Mixed Household Waste 

      Eggen, Sigvart; Sandaunet, Kurt; Kolbeinsen, Leiv; Kvithyld, Anne (Chapter, 2020)
      Aluminium is used in packaging due to its density, strength and preservative capabilities. This paper outlines a methodology to evaluate the recyclability of aluminium waste, where parameters of scrap type, pre-treatment ...
    • Recycling of Aluminium from Mixed Household Waste 

      Eggen, Sigvart; Sandaunet, Kurt; Kolbeinsen, Leiv; Kvithyld, Anne (Chapter, 2020)
      Aluminium is used in packaging due to its density, strength and preservative capabilities. This paper outlines a methodology to evaluate the recyclability of aluminium waste, where parameters of scrap type, pre-treatment ...