Blar i NTNU Open på forfatter "Selbach, Sverre Magnus"

Viser treff 41-60 av 113

    • Electronic Structure and Surface Chemistry of Hexagonal Boron Nitride on HOPG and Nickel Substrates 

      Småbråten, Didrik Rene; Nylund, Inger-Emma; Marshall, Kenneth; Walker, Julian Bradley; Benelmekki, Maria; Einarsrud, Mari-Ann; Kioseoglou, Joseph; Selbach, Sverre Magnus (Peer reviewed; Journal article, 2023)
      The effect of point defects and interactions with the substrate are shown by density functional theory calculations to be of significant importance for the structure and functional properties of hexagonal boron nitride ...

    • Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction 

      Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Skjærvø, Susanne Linn; van Beek, Wouter; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2018)
      Ferroelectric materials are crucial for today’s technological society and nanostructured ferroelectric materials are important for the downscaling of devices. Controlled and reproducible synthesis of these materials are, ...

    • A fast, low temperature synthesis method for hexagonal YMnO3: Kinetics, purity, size and shape as studied by in situ X-ray diffraction 

      Marshall, Kenneth; Blichfeld, Anders Bank; Skjærvø, Susanne Linn; Grendal, Ola Gjønnes; Van Beek, Wouter; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2020)
      The reaction mechanisms, phase development and kinetics of the hydrothermal synthesis of hexagonal‐YMnO3 from Y2O3 and Mn2O3 using in situ X‐ray diffraction are reported under different reaction conditions with temperatures ...

    • Ferroelectric domain walls for nanotechnology 

      Meier, Dennis Gerhard; Selbach, Sverre Magnus (Journal article, 2021)
      Ferroelectric domain walls have emerged as a new type of interface in which the dynamic characteristics of ferroelectricity introduce the element of spatial mobility, allowing real-time adjustment of position, density and ...

    • Ferroelectric Transitions in SrxBa(1-x)Nb2O6 - Effect of Thermal History on the Functional Properties 

      Brandvik, Trond (Master thesis, 2015)
      Many functional materials used in todays electronic equipment have a high content lead. Due to the environmental challenges related to production and usage of such materials, extensive research has been preformed on lead-free ...

    • Ferroelectric Tungsten Bronzes 

      Olsen, Gerhard Henning (Doctoral thesis at NTNU;2016:237, Doctoral thesis, 2016)
      Ferroelectric materials are everywhere in the modern society, from consumer electronics to car engines. Applications cover a whole range of devices such as sensors, actuators and transducers due to their dielectric or ...

    • Ferroelectricity in the multiferroic hexagonal manganites 

      Lilienblum, Martin; Lottermoser, Thomas; Manz, Sebastian; Selbach, Sverre Magnus; Cano, Andres; Fiebig, Manfred (Journal article, 2015)
      Since their discovery in 1963 the hexagonal manganites have consolidated their role as exotic ferroelectrics with astonishing functionalities. Their introduction as room-temperature device ferroelectrics was followed by ...

    • Finite temperature ab initio simulations of the lattice thermal conductivity of XNiBi, X=(Sc, Y, La), based half-Heuslers 

      Røe, Ingeborg Treu (Master thesis, 2017)
      Over the past few years, the half-Heusler materials have attracted attention for their potential within thermoelectric applications. This is mainly due to the flexibility of half-Heusler crystal structure. The half-Heuslers ...

    • First principles study of epitaxial strain induced phenomena and chemical expansion in perovskite oxides 

      Marthinsen, Astrid (Doctoral theses at NTNU;2018:285, Doctoral thesis, 2018)
      The many exotic properties found in complex oxides have great potential for device applications. Complex oxides within the perovskite structure are particularly attractive, as they display a large diversity of chemical ...

    • First-Principles Calculations of Oxygen Vacancy Formation in Epitaxially Strained La1-xCaxMnO3 

      Thøgersen, Rasmus Vester (Master thesis, 2016)
      Using epitaxial strain as a degree of freedom is a promising way to tailor the properties in thin films of transition metal oxides. Since the ground state of such materials tend to have many competing low-energy states ...

    • First-principles study of the effect of (111) strain on octahedral rotations and structural phases of LaAlO3 

      Moreau, Magnus; Marthinsen, Astrid; Selbach, Sverre Magnus; Tybell, Per Thomas Martin (Journal article; Peer reviewed, 2017)
      The structural and electronic response of LaAlO3 to biaxial strain in the (111) plane is studied by density functional theory (DFT) and compared with strain in the (001) plane and isostatic strain. For (111) strain, in-plane ...

    • First-principles study of topologically protected vortices and ferroelectric domain walls in hexagonal YGaO3 

      Småbråten, Didrik Rene; Nakata, Ayako; Meier, Dennis; Miyazaki, Tsuyoshi; Selbach, Sverre Magnus (Peer reviewed; Journal article, 2020)
      Ferroelectric behavior on the meso- and macroscopic scale depends on the formation and dynamics of domains and controlling the domain patterns is imperative to device performance. While density functional theory (DFT) ...

    • Goldstone-like phonon modes in a (111)-strained perovskite 

      Marthinsen, Astrid; Griffin, Sinead M; Moreau, Magnus; Grande, Tor; Tybell, Per Thomas Martin; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2018)
      Goldstone modes are massless particles resulting from spontaneous symmetry breaking. Although such modes are found in elementary particle physics as well as in condensed-matter systems like superfluid helium, superconductors, ...

    • High interfacial charge storage capability of carbonaceous cathodes for Mg batteries 

      Wang, Lu; Jiang, Bo; Vullum, Per Erik; Svensson, Ann Mari; Erbe, Andreas; Selbach, Sverre Magnus; Xu, Huailiang; Vullum-Bruer, Fride (Journal article; Peer reviewed, 2018)
      A rechargeable Mg battery where the capacity mainly originates from reversible reactions occurring at the electrode/electrolyte interface efficiently avoids the challenge of sluggish Mg intercalation encountered in ...

    • Hydrothermal syntheis and characterization of BaTiO3 nanoparticles 

      Hempel, Frida Sveen (Master thesis, 2018)
      This thesis investigates the size dependent dipole disorder in ferroelectric materials, which leads to a loss of macroscopic ferroelectricity, and the role of the depolarization field on this disorder. Structural ...

    • Hydrothermal synthesis of hexagonal YMnO3 and YbMnO3 below 250 °C 

      Marshall, Kenneth Paul; Eidem, Sigurd Opdal; Småbråten, Didrik Rene; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)
      The hydrothermal synthesis of hexagonal YMnO3 and YbMnO3 are reported using high KOH mineraliser concentrations (>10 M) and low temperatures (<240 °C). The relation between reaction parameters and resulting phase purity ...

    • Interactions between point defects and internal interfaces in bismuth ferrite 

      Xia, Lu (Doctoral theses at NTNU;2019:148, Doctoral thesis, 2019)
      BiFeO3 (BFO) is the most studied multiferroic material and a promising candidate for future information storage. One challenge for practical applications of this material is a thorough understanding and control of the ...

    • Interstitial oxygen as a source of p-type conductivity in hexagonal manganites 

      Skjærvø, Sandra Helen; Tjønneland Wefring, Espen; Nesdal, Silje K.; Gaukås, Nikolai Helth; Olsen, Gerhard Henning; Glaum, Julia; Tybell, Per Thomas Martin; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2016)
      Hexagonal manganites, h-RMnO3 (R=Sc, Y, Ho–Lu), have been intensively studied for their multiferroic properties, magnetoelectric coupling, topological defects and electrically conducting domain walls. Although point defects ...

    • Intrinsic and extrinsic conduction contributions at nominally neutral domain walls in hexagonal manganites 

      Schultheiß, Jan; Schaab, Jakob; Småbråten, Didrik Rene; Skjærvø, Sandra Helen; Bourret, Edith; Yan, Zewu; Selbach, Sverre Magnus; Meier, Dennis Gerhard (Peer reviewed; Journal article, 2020)
      Conductive and electrostatic atomic force microscopy (cAFM and EFM) are used to investigate the electric conduction at nominally neutral domain walls in hexagonal manganites. The EFM measurements reveal a propensity of ...

    • Lead-free piezoelectric Materials based on Silver Niobate 

      Walø, Stine Lund (Master thesis, 2013)
      Studies done on base material AgNbO3 reveals that a large polarization, which is comparable to values reported for PZT, occurs under application of a high electric field. Density functional calculations show that solid ...