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Helmer Fjellvåg

centre for materials science and nanotechnology, department of chemistry, university of oslo, p. o. box 1033 blindern, n-0315 oslo, norway

69H-index
808Paper Count
2.3WCitation Count
Published Papers 299
Publication Date
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Correction: Tracking phase transformations in LiMn1.5+xNi0.5−xO4 by high resolution X-ray diffraction
errJ. Mater. Chem. A
IF0
err2025-12-19
err0
errOAAI
errHalvor Høen Hval; Helmer Fjellvåg
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Tracking phase transformations in LiMn1.5+xNi0.5-xO4 by high resolution X-ray diffraction
errJ. Mater. Chem. A
IF9.5
err2025-10-31
err0
errOAAI
errHalvor Høen Hval; Helmer Fjellvåg
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On the low temperature crystal structure of KCrF 3
errJournal of Solid State Chemistry
IF3.5
err2025-08-08
err0
errOAAI
errØystein S. Fjellvåg; Dipankar Saha; Dmitry Chernyshov; Fabian L.M. Bernal; Helmer Fjellvåg; Bjørn C. Hauback; Bruno Gonano
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Unique Na5-xSbSe Phase Enables High-Rate Performance of Sb2Se3 Anodes in Na-Ion Batteries
errADVANCED ENERGY MATERIALS
IF26
err2025-05-13
err0
errOAAI
errSkurtveit, A; Pastusic, A Jr; Brennhagen, A; Maddar, FM; Mohn, CE; Karmakar, A; O'Keefe, CA; Hasa, I; Cavallo, C; Arstad, B; Fjellvåg, H; Wragg, DS; Koposov, AY
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Crystal Structure of Nd10.67Pt4O24, a New Neodymium Platinate
errACS OMEGA
IF4.3
err2025-03-19
err0
errOAAI
errFjellvag, Oystein Slagtern; Fjellvaag, Helmer; Hessevik, Julie; Sjastad, Anja Olafsen; Steciuk, Gwladys
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Reactivity of gaseous PtO2 and RhO2 with LaNiO3 thin films: a systematic XPS study
errMATERIALS ADVANCES
IF4.7
err2025-01-01
err0
errOAAI
errHessevik, Julie; Sonsteby, Henrik H.; Fjellvag, Helmer; Sjastad, Anja O.
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PVDF fluorination of La4Co3O10: Synthesis, structure and physical properties of La4Co3O10F2
errSCRIPTA MATERIALIA
IF5.6
err2025-01-01
err1
errOAAI
errGonano, Bruno; Fjellvag, Oystein Slagtern; Steciuk, Gwladys; Marshall, Kenneth; Fjellvag, Helmer; Valldor, Martin
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Superstructure of Locally Disordered Na2Zn2TeO6
errCHEMISTRY OF MATERIALS
IF7
err2024-11-13
err0
errOAAI
errHempel, Frida Sveen; Slawinski, Wojciech A.; Arstad, Bjornar; Fjellvag, Helmer
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Elucidation of the Reaction Mechanisms in Antifluorite-Type Li5+xFe1-xCoxO4 Positive Electrodes for Li-Ion Batteries
errBATTERIES & SUPERCAPS
IF4.7
err2024-08-15
err0
errOAAI
errThogersen, Rasmus Vester; Hval, Halvor Hoen; Fjellvag, Helmer
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Local Symmetry Deviation from the Average Structure of MnAs Revealed by Pair Distribution Function
errINORGANIC CHEMISTRY
IF4.7
err2024-08-08
err0
errOAAI
errSaha, Dipankar; Slawinski, Wojciech A.; Kumar, Susmit; Fjellvag, Helmer
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(De)sodiation Mechanism of Bi2MoO6 in Na-Ion Batteries Probed by Quasi-Simultaneous Operando PDF and XAS
errCHEMISTRY OF MATERIALS
IF7
err2024-08-02
err0
errOAAI
errBrennhagen, Anders; Skurtveit, Amalie; Wragg, David S.; Cavallo, Carmen; Sjastad, Anja O.; Koposov, Alexey Y.; Fjellvag, Helmer
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Order-to-Disorder Transition and Hydrogen Bonding in the Jahn-Teller Active NH4CrF3 Fluoroperovskite
errINORGANIC CHEMISTRY
IF4.7
err2024-05-24
err1
errOAAI
errFjellvag, Oystein S.; Gonano, Bruno; Bernal, Fabian L. M.; Amedi, Salah B.; Lyu, Jike; Pomjakushin, Vladimir; Medarde, Marisa; Chernyshov, Dmitry; Marshall, Kenneth; Valldor, Martin; Fjellvag, Helmer; Hauback, Bjorn C.
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Unraveling the (De)sodiation Mechanisms of BiFeO3 at a High Rate with Operando XRD
errACS APPLIED MATERIALS & INTERFACES
IF8.2
err2024-02-27
err1
errOAAI
errBrennhagen, Anders; Skautvedt, Casper; Cavallo, Carmen; Wragg, David S.; Koposov, Alexey Y.; Sjastad, Anja O.; Fjellvag, Helmer
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Dynamics of Interlayer Na-Ions in Ga-Substituted Na2Zn2TeO6 (NZTO) Studied by Variable-Temperature Solid-State 23Na NMR Spectroscopy and DFT Modeling
errACS PHYSICAL CHEMISTRY AU
IF4.3
err2023-05-04
err2
errOAAI
errHempel, Frida Sveen; Martineau-Corcos, Charlotte; Bianchini, Federico; Fjellvag, Helmer; Arstad, Bjornar
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First-Principles Insights into the Relative Stability and Physical and Chemical Properties of MoSe2
errACS OMEGA
IF4.3
err2023-04-05
err11
errOAAI
errBanu, S. Lathifa; Veerapandy, Vasu; Fjellvag, Helmer; Vajeeston, Ponniah
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First principle studies on electronic and thermoelectric properties of Fe2TiSn based multinary Heusler alloys
errCOMPUTATIONAL MATERIALS SCIENCE
IF3.3
err2023-01-01
err6
errOAAI
errChoudhary, Mukesh K.; Fjellvag, Helmer; Ravindran, Ponniah
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5D total scattering computed tomography reveals the full reaction mechanism of a bismuth vanadate lithium ion battery anode (vol 24, pg 27075, 2022)
errPHYSICAL CHEMISTRY CHEMICAL PHYSICS
IF2.9
err2023-01-01
err0
errOAAI
errSottmann, Jonas; Ruud, Amund; Fjellvag, Oystein S.; Vaughan, Gavin B. M.; Di Michel, Marco; Fjellvag, Helmer; Lebedev, Oleg I.; Vajeeston, Ponniah; Wragg, David S.
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Exploring V-Fe-Co-Ni-Al and V-Fe-Co-Ni-Cu high entropy alloys for magnetocaloric applications
errJOURNAL OF ALLOYS AND COMPOUNDS
IF6.3
err2022-11-01
err10
errOAAI
errEggert, Bruno G. F.; Delczeg-Czirjak, Erna K.; Maccari, Fernando; Kumar, Susmit; Gutfleisch, Oliver; Fjellvag, Helmer; Hauback, Bjorn C.; Frommen, Christoph
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Effects of Ga Substitution on the Local Structure of Na2Zn2TeO6
errINORGANIC CHEMISTRY
IF4.7
err2022-08-09
err5
errOAAI
errHempel, Frida Sveen; Bianchini, Federico; Arstad, Bjornar; Fjellvag, Helmer
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Corrigendum: Operando XRD studies on Bi2MoO6 as anode material for Na-ion batteries (vol 33, 185402, 2022)
errnanotechnology
IF2.8
err2022-06-14
err0
errOAAI
errBrennhagen, Anders; Cavallo, Carmen; Wragg, David S.; Vajeeston, Ponniah; Sjastad, Anja O.; Koposov, Alexey Y.; Fjellvag, Helmer
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Research Directions

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Co-authors
Cooperation Journals
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O
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