Browsing Kjemisk institutt by Author "Fjellvåg, Helmer"

Now showing items 41-60 of 68

  • Luminescence properties of europium titanate thin films grown by atomic layer deposition 
    Hansen, Per-Anders; Fjellvåg, Helmer; Finstad, Terje; Nilsen, Ola (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    Luminescent europium titanium oxides (EuxTiyOz) have been deposited as thin films by atomic layer deposition (ALD) in the temperature range 225 to 375 °C with control of the stoichiometry from pure TiO2 to pure Eu2O3, and ...
  • Luminescent properties of europium titanium phosphate thin films deposited by atomic layer deposition 
    Getz, Michael; Hansen, Per-Anders; Fjellvåg, Helmer; Nilsen, Ola (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    In the present contribution we assess the luminescent properties of amorphous europium titanium phosphate thin films. The films have been deposited by atomic layer deposition, using the precursor combinations Eu(thd)3 (thd ...
  • Luminescent YbVO4 by atomic layer deposition 
    Getz, Michael; Hansen, Per-Anders; Ahmed, Mohammed Amin Karim; Fjellvåg, Helmer; Nilsen, Ola (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    UV to visible and near-infrared converting thin films of YbVO4 have been deposited by atomic layer deposition, using the precursor combinations Yb(thd)3 (thd = 2,2,6,6-tetramethyl-3,5-heptanedione) and O3, and VO(thd)2 and ...
  • Methyl 5-iodo-2-methoxybenzoate 
    Lundvall, Fredrik; Wragg, David; Dietzel, Pascal D.C.; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2014)
    In the title compound, C9H9IO3, the mol­ecules are close to planar [maximum deviation from benzene ring plane = 0.229 (5) Å for the methyl carboxylate C atom] with the methyl groups oriented away from each other. In the ...
  • MgH2–CoO: a conversion-type composite electrode for LiBH4-based all-solid-state lithium ion batteries 
    El-Kharbachi, Abdelouahab; Uesato, Hiroki; Kawai, Hironori; Wenner, Sigurd; Miyaoka, Hiroki; Sørby, Magnus Helgerud; Fjellvåg, Helmer; Ichikawa, Takayuki; Hauback, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Several studies have demonstrated that MgH2 is a promising conversion-type anode toward Li. A major obstacle is the reversible capacity during cycling. Electrochemical co-existence of a mixed metal hydride-oxide conversion ...
  • On phase relations, structural and magnetic properties of the stable manganese carbides Mn23C6, Mn5C2 and Mn7C3 
    Karen, Pavel; Fjellvåg, Helmer; Kjekshus, Arne; Andresen, P.H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1991)
    © 1991 Acta Chemica Scandinavica
  • On the properties of the YBa8Cu4O12+η phase 
    Fjellvåg, Helmer; Karen, Pavel; Kjekshus, Arne; Grepstad, J.K. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1988)
    © 1988 Acta Chemica Scandinavica
  • One-pot synthesis of cobalt-rhenium nanoparticles taking the unusual beta-Mn type structure 
    Zacharaki, Eirini; Bremmer, Marien G.; Vajeeston, Ponniah; Kalyva, Maria Evangelou; Fjellvåg, Helmer; Kooyman, Patricia J.; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Using a facile one-pot colloidal method, it is now possible to obtain monodisperse Co1−xRex nanoparticles (NPs), with excellent control of Re stoichiometry for x < 0.15. Re-incorporation in terms of a solid solution ...
  • Operando Investigations of Lithiation and Delithiation Processes in the BiVO4 Anode Material 
    Ruud, Amund; Sottmann, Jonas; Vajeeston, Ponniah; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
  • Operando XRD studies on Bi2MoO6 as anode material for Na-ion batteries 
    Brennhagen, Anders; Cavallo, Carmen; Wragg, David Stephen; Ponniah, Vajeeston; Sjåstad, Anja Olafsen; Koposov, Alexey; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Based on the same rocking-chair principle as rechargeable Li-ion batteries, Na-ion batteries are promising solutions for energy storage benefiting from low-cost materials comprised of abundant elements. However, despite ...
  • Order-to-Disorder Transition and Hydrogen Bonding in the Jahn-Teller Active NH4CrF3 Fluoroperovskite 
    Fjellvåg, Øystein Slagtern; Gonano, Bruno; Bernal, Fabian Leonardo Martinez; Amedi, Salah Bra; Lyu, Jike; Pomjakushin, Vladimir; Medarde, Marisa; Chernyshov, Dmitry; Marshall, Kenneth; Valldor, Björn Martin; Fjellvåg, Helmer; Hauback, Bjørn Christian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2024)
    Large quantities of high-purity NH4CrF3 have been synthesized using a wet-chemical method, and its structural chemistry and magnetic properties are investigated in detail for the first time. NH4CrF3 is a tetragonal ...
  • Phase and Orientation Control of NiTiO3 Thin Films 
    Bratvold, Jon E.; Fjellvåg, Helmer; Nilsen, Ola (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Subtle changes in the atomic arrangement of NiTiO3 in the ilmenite structure affects its symmetry and properties. At high temperatures, the cations are randomly distributed throughout the structure, resulting in the corundum ...
  • Physical properties of Ruddlesden-Popper (n = 3) nickelate: La4Ni3O10 
    Kumar, Susmit; Fjellvåg, Øystein; Sjåstad, Anja Olafsen; Fjellvåg, Helmer (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Nickelates, just like their isoelectronic cousins (the cuprate superconductors), are candidates for high temperature superconductivity. As charge density waves (CDW) and superconductivity might share a similar microscopic ...
  • Pseudo-ternary LiBH4-LiCl-P2S5 system as structurally disordered bulk electrolyte for all-solid-state lithium batteries 
    El-Kharbachi, Abdelouahab; Wind, Julia; Ruud, Amund; Høgset, Astrid Bygdås; Nygård, Magnus Moe; Zhang, Junxian; Sørby, Magnus Helgerud; Kim, Sangryun; Cuevas, Fermin; Orimo, Shin-Ichi; Fichtner, Maximilian; Latroche, Michel; Fjellvåg, Helmer; Hauback, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    The properties of the mixed system LiBH4–LiCl–P2S5 are studied with respect to all-solid-state batteries. The studied material undergoes an amorphization upon heating above 60 °C, accompanied with increased Li+ conductivity ...
  • SAPO-37 microporous catalysts: revealing the structural transformations during template removal 
    Kalantzopoulos, Georgios N.; Lundvall, Fredrik; Lind, Anna Maria; Arstad, Bjørnar; Chernyshov, Dmitry; Fjellvåg, Helmer; Wragg, David (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    We have studied the structural behavior of SAPO-37 during calcination using simultaneous in situ powder X-ray diffraction (PXRD) and mass spectroscopy (MS) in addition to ex situ thermogravimetric analysis (TGA) and ...
  • Search for potential precursors for Si-atomic layer deposition- a quantum chemical study 
    Vajeeston, Ponniah; Fjellvåg, Helmer; Nilsen, Ola (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Thin film of silicon is an interesting material for many technological applications in electronic industry and in energy harvesting technologies, but requires a method for controlled growth of thin films. The purpose of ...
  • Structural and magnetic aspects of La4(Co1-xNix)3O10+δ (0 ≤ x ≤ 1) 
    Nagell, Marius Uv; Kumar, Susmit; Sørby, Magnus Helgerud; Fjellvåg, Helmer; Sjåstad, Anja Olafsen (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2015)
    The Ruddlesden–Popper (RP3) type oxides, La4Co3O10+δ and La4Ni3O10+δ, form a complete solid solution. Powder X-ray and neutron diffraction data show that La4(Co1−xNix)3O10+δ is isostructural to the monoclinic La4Co3O10+δ ...
  • Structural and magnetic characterization of the elusive Jahn-Teller active NaCrF3 
    Bernal, Fabian Leonardo Martinez; Sottmann, Jonas; Wragg, David; Fjellvåg, Helmer; Fjellvåg, Øystein; Drathen, Christina; Slawinski, Wojciech Andrzej; Løvvik, Ole Martin (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    We report on the structural and magnetic properties of the elusive Jahn-Teller active compound NaCrF3, for first time synthesized in large quantities allowing detailed characterization. The crystal structure of NaCrF3 is ...
  • Structural and optical properties of lanthanide oxides grown by atomic layer deposition (Ln = Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb) 
    Hansen, Per-Anders; Fjellvåg, Helmer; Finstad, Terje; Nilsen, Ola (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2013)
    Ln2O3 thin films with optically active f-electrons (Ln = Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, Yb) have been grown on Si(100) and soda lime glass substrates by atomic layer deposition (ALD) using Ln(thd)3 (Hthd = ...
  • Structural properties and phase transitions of Y2BaCuO5 and YBa2Cu3O9−d 
    Fjellvåg, Helmer; Karen, Pavel; Kjekshus, Arne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1987)
    © 1987 Acta Chemica Scandinavica