Blar i NTNU Open på forfatter "Einarsrud, Mari-Ann"

Viser treff 121-140 av 197

    • Optimisation of Spray Pyrolysed (La0.6Sr0.4)0.99CoO3 Cathodes for Solid Oxide Fuel Cells 

      Høyem, Sigrid Sognli (Master thesis, 2016)
      The effect of the precursor concentration and the concentration of citric acid (CA) on the properties of (La0.6Sr0.4)0.99CoO3 (LSC), prepared by spray pyrolysis, has been studied. Precursor solutions with concentrations ...

    • Oxidation of silicon in aqueous media 

      Jørgensen, Håkon Trygve Strøm (Master thesis, 2011)
      Silicon is used in the production of various ceramic products. As the solar industry is advancing, the need for reusable crucibles for the casting of solar grade silicon has arisen. One idea is to produce silicon nitride ...

    • Oxidation of silicon powder in humid air 

      Nymark, Anne Marthe (Master thesis, 2012)
      Silicon undergoes oxidation at room temperature, causing a formation of an oxide layer on its surface. Gaining knowledge about the oxide layer formed during ageing, is valuable with regards to production of high quality ...

    • Performance of a thermoelectric module based on n-type (La0.12Sr0.88)0.95TiO3-δ and p-type Ca3Co4-xO9+δ 

      Kanas, Nikola; Skomedal, Gunstein; Desissa, Temesgen D.; Feldhoff, Armin; Grande, Tor; Wiik, Kjell; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2020)
      Here, we present the performance of a thermoelectric (TE) module consisting of n-type (La0.12Sr0.88)0.95TiO3 and p-type Ca3Co4-xO9+δ materials. The main challenge in this investigation was operation of TE module in different ...

    • Phase relations and thermomechanical properties of (Gd2Zr2O7)1-x(YbSZ)x based thermal barrier coatings (0 ≤x≤ 0.98) 

      Tabeshfar, Mohadese; Salehi, Mehdi; Dini, Ghasem; He, Jianying; Einarsrud, Mari-Ann; Wiik, Kjell (Peer reviewed; Journal article, 2021)
      Doped Gd2Zr2O7 materials have interesting properties as thermal barrier coatings (TBC) to replace the YSZ topcoats traditionally used. Here we investigate the thermomechanical properties and phase relations of Gd2Zr2O7 ...

    • Piezoelectric K0.5Na0.5NbO3 Ceramics Textured Using Needlelike K0.5Na0.5NbO3 Templates 

      Haugen, Astri Bjørnetun; Olsen, Gerhard Henning; Madaro, Francesco; Morozov, Maxim; Tutuncu, Goknur; Jones, Jacob L.; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2014)
      Improved performance by texturing has become attractive in the field of lead-free ferroelectrics, but the effect depends heavily on the degree of texture, type of preferred orientation, and whether the material is a rotator ...

    • Pilot scale fabrication of lanthanum tungstate supports for H<inf>2</inf> separation membranes 

      Gurauskis, Jonas; Gil, Vanesa; Lin, Bin; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2022)
      This paper reports the fabrication of asymmetric tubular geometry lanthanum tungstate-based membranes for high temperature H2 separation applications. As starting materials, powders with the compositions La28-yW4+yO54+δ ...

    • Polarization and strain response in Bi0.5K0.5TiO3-BiFeO3 ceramics 

      Morozov, Maxim; Einarsrud, Mari-Ann; Grande, Tor (Journal article; Peer reviewed, 2012)
      Highly dense and phase-pure ferroelectric ceramics in the (1-x)Bi0.5K0.5TiO3–xBiFeO3 system have been prepared and examined in a wide range of composition (0.1 ≤ x ≤ 0.9). The dielectric and electromechanical properties ...

    • Potassium Sodium Niobate Thin Films by Chemical Solution Deposition 

      Pham, Ky-Nam (Doktoravhandlinger ved NTNU, 1503-8181; 2014:300, Doctoral thesis, 2014)
      Stable aqueous KNN-based precursor solutions were developed by using simple and cheap starting materials and good wetting of the precursor solution was secured by the addition of small amounts of polyvinylalcohol. The ...

    • Preparation and surface modifications on hollow silica nano spheres - Nano- insulation 

      Solibakke, Per (Master thesis, 2018)
      Hollow silica nano spheres (HSNS) were synthesised with the use of polystyrene templates. Based on the polystyrene templates, tetraethyl orthosilicate (TEOS) was hydrolysed and attached on the surface, in either an acidic ...

    • Processing of high performing composite cathodes for protonic ceramic fuel cells by exsolution 

      Rioja-Monllor, Laura; Bernuy-Lopez, Carlos; Fontaine, Marie-Laure; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2019)
      La0.5Ba0.5CoO3-δ-BaZrO3 (LB-BZ)-based composite materials were prepared by a modified Pechini sol-gel method combined with exsolution. Two different LB-BZ composites were prepared through two alternative thermal treatments ...

    • Production of Lead-free Electroceramics: K0.5Na0.5NbO3 substituted with Li & Ta 

      Strand, Jon Martinsen (Master thesis, 2011)
      K0:485Na0:485Li0:03Nb0:8Ta0:2O3 powder has been prepared by spray pyrolysis ofaqueous solutions of K/Na/Li nitrates mixed with water soluble Nb and Ta precursors.The as-prepared ceramic powder was calcined at 600 °C to ...

    • PVA-assisted combustion synthesis and characterization of porous nanocomposite Li2FeSiO4/C 

      Zhou, Haitao; Einarsrud, Mari-Ann; Vullum-Bruer, Fride (Journal article; Peer reviewed, 2012)
      Porous Li2FeSiO4/C nanocomposites were synthesized by a PVA-assisted combustion method, and phase pure Li2FeSiO4 was produced for samples prepared with 20 and 30 wt.% starch. The electrochemical properties of the Li2FeSiO4/C ...

    • 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 ...

    • Samanlikning av ferroelektriske eigenskapar i PbZrxTi1-xO3, BaTiO3 og [N(CH3)4][FeBrCl3] 

      Øvrehus, Asbjørn (Bachelor thesis, 2023)
      Denne teksten skal sjå på fordelane og ulempene ved å bruke supermolekylære ferroelektriske materialer som erstatning for intermolekylære ferroelektriske materialer, som bly zirkonat titanat (PZT) og barium titanat (BTO). ...

    • Self-propagating high-temperature synthesis of zirconium disilicide 

      Dalene, Johan Moan (Master thesis, 2020)
      I denne oppgaven ble en selv-utviklet reaktor som benyttet en Mg-BaO2 antennelsesblanding i en rørovn bruk til SHS av ZrSi2. Litteratur om forbrenningssyntese, zirkonium, silisium og Zr-Si systemet ble studert for å etablere ...

    • Semi-Wet Design of High Voltage Subsea Cables with XLPE-insulation 

      Lundevall, Falke Balland (Bachelor thesis, 2024)
      Et semi-våt design av undersjøiske høyspentkabler (HVSC) har blitt undersøkt som et mulig alternative til tørr-design gjennom analyse av vanntrær, akkumulering av romladninger og urenheter i tverrbundet polyetylen ...

    • Silicon for silicon nitride based products 

      Øvregård, Harald (Master thesis, 2013)
      Previous studies have shown that the oxide layer on the surface of silicon particles can reduce the hydrogen evolution that comes from contacting silicon with water during slip casting, prior to nitridation. This study ...