Browsing Kjemisk institutt by Author "Fjellvåg, Asbjørn Slagtern"

Now showing items 1-6 of 6

  • Energy of dendritic avalanches in thin-film superconductors 
    Qureishy, Thomas; Vestgården, Jørn Inge; Qviller, Atle Jorstad; Fjellvåg, Asbjørn Slagtern; Meckbach, Johannes Maximilian; Torgovkin, Andrii; Johansen, Tom Henning; Ilin, Konstantin; Siegel, Michael; Maasilta, Ilari J.; Mikheenko, Pavlo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    A method for calculating stored magnetic energy in a thin superconducting film based on quantitative magneto-optical imaging is developed. Energy and magnetic moment are determined with these calculations for full hysteresis ...
  • Interplay of valence states and magnetic interactions in the perovskite system LaNi1–xRhxO3 
    Fjellvåg, Asbjørn Slagtern; Fjellvåg, Øystein; Kumar, Susmit; Ruud, Amund; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
    We report on the structural, magnetic and electronic properties of Rh substituted LaNiO3, LaNi1–xRhxO3 (0 ​≤ ​x ​≤ ​1). Increased Rh contents are associated with increased structural distortion, and we observe a phase ...
  • Mechanism of grain reconstruction of Pd and Pd/Ni wires during Pt–catchment 
    Fjellvåg, Asbjørn Slagtern; Jørgensen, Peter Stanley; Waller, David; Wragg, David Stephen; Michiel, Marco Di; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2022)
    We have investigated industrial Pd and Pd/Ni (91.3/8.7 at.%) wires and gauzes used for Pt-catchment during the ammonia oxidation process, focusing on the origin of the grain reconstruction phenomena. In situ X-ray absorption ...
  • Platinum Catchment by Noble Metal Alloys and structural studies of Pt- and Rh-containing perovskites 
    Fjellvåg, Asbjørn Slagtern (Doctoral thesis / Doktoravhandling, 2022)
    One of the steps in the production of synthetic nitrogen-based fertilizers is the oxidation of ammonia (NH3) to nitric oxide (NO). In this reaction, Pt/Rh (95/5 wt. %) is used as a catalyst and a significant Pt-loss occurs ...
  • Pt-Catchment Using Pd/Au Alloys: Effect of Enhanced Diffusion 
    Fjellvåg, Asbjørn Slagtern; Waller, David; By, Thomas; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    We have studied a series of Pd/Au alloys as Pt-catchment materials, both in lab-scale experiments and in an industrial ammonia oxidation plant. Our focus has been on how bulk Pt diffusion affects grain reconstruction in ...
  • Structural disorder and antiferromagnetism in LaNi1–xPtxO3 
    Fjellvåg, Asbjørn Slagtern; Fjellvåg, Øystein; Breard, Y.; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2021)
    We report on the B-site substitution of Pt for Ni in the system LaNi1–xPtxO3. The system can only be synthesized between x ​≤ ​0.50, with LaNiO3 (x ​= ​0.00) and the stoichiometric double perovskite La2NiPtO6 (x ​= ​0.50) ...