• A new material for oxygen-permeable membranes 

      Adnan, Mohammed Mostafa (Master thesis, 2017)
      In this study, hexagonal YMnO3 doped with 15% Ti was used in the preparation of an asymmetric oxygen permeable membrane. Several different methods for the fabrication of the asymmetric membrane have been used, and the ...
    • Charged domain walls in improper ferroelectric hexagonal manganites and gallates 

      Småbråten, Didrik Rene; Meier, Quintin Noel; Skjærvø, Sandra Helen; Inzani, Katherine; Meier, Dennis; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2018)
      Ferroelectric domain walls are attracting broad attention as atomic-scale switches, diodes and mobile wires for next-generation nanoelectronics. Charged domain walls in improper ferroelectrics are particularly interesting ...
    • Development of an asymmetrical oxygen permeable membrane based on hexagonal manganites 

      Hoggen, Stine Marie (Master thesis, 2016)
      Pure oxygen is a commodity chemical needed in many industries. Separation of oxygen from air is usually performed by the expensive and highly energy-demanding process of cryogenic distillation. A promising and more ...
    • Development of Rare Earth Metal Iron Oxides as Mixed Ionic and Electronic Conductors 

      Blom, Christine (Master thesis, 2014)
      In recent years there has been an increasing interest in finding a new and less energy demanding alternative to cryogenic distillation in the production of pure oxygen gas. The use of oxygen permeable membranes has been ...
    • Electrical half-wave rectification at ferroelectric domain walls 

      Schaab, Jakob; Skjærvø, Sandra Helen; Krohns, Stephan; Dai, Xiaoyu; Holtz, Megan, E.; Cano, Andrés; Lilienblum, Martin; Yan, Zewu; Bourret, Edith; Muller, David A.; Fiebig, Manfred; Selbach, Sverre Magnus; Meier, Dennis (Journal article; Peer reviewed, 2018)
      Domain walls in ferroelectric semiconductors show promise as multifunctional two-dimensional elements for next-generation nanotechnology. Electric fields, for example, can control the direct-current resistance and reversibly ...
    • 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 ...
    • Oxygen vacancies in the bulk and at neutral domain walls in hexagonal YMnO3 

      Skjærvø, Sandra Helen; Småbråten, Didrik Rene; Spaldin, Nicola A; Tybell, Per Thomas Martin; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2018)
      We use density functional calculations to investigate the accommodation and migration of oxygen vacancies in bulk hexagonal YMnO3, and to study interactions between neutral ferroelectric domain walls and oxygen vacancies. ...
    • Structural and chemical stability of the hexagonal manganites 

      Skjærvø, Sandra Helen (Doctoral theses at NTNU;2017:252, Doctoral thesis, 2017)
      The link between atomic interactions and functional properties in the fascinating material system called hexagonal manganites is investigated in this thesis. By using both neutron scattering measurements and first principles ...
    • Terbium Doped ITO Thin Films Prepared by an Aqueous Sol-Gel Method 

      Skjærvø, Sandra Helen (Master thesis, 2013)
      Transparent conducting oxides (TCOs) combine the properties of optical transparency in the visible region of the electromagnetic spectrum and a near-metallic electrical conductivity. This combination make them very applicable ...
    • Unconventional Continuous Structural Disorder at the Order-Disorder Phase Transition in the Hexagonal Manganites 

      Skjærvø, Sandra Helen; Meier, Quintin Noel; Feygenson, Mikhail; Spaldin, Nicola A.; Billinge, Simon J. L.; Božin, Emil S.; Selbach, Sverre Magnus (Journal article; Peer reviewed, 2019)
      The improper ferroelectricity in YMnO3 and other related multiferroic hexagonal manganites is known to cause topologically protected ferroelectric domains that give rise to rich and diverse physical phenomena. The local ...