Browsing Kjemisk institutt by Author "Løken, Andreas"
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Løken, Andreas; Saeed, Sarmad Waheed; Norderhaug, Marit; Liu, Xin; Bjørheim, Tor Svendsen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)In the present contribution, we assess the efficiency of the alkali metals (Na, K, Rb and Cs) as A-site acceptor dopants in proton conducting BaZrO3 by first principles calculations. The calculated acceptor–proton complexes ...
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Løken, Andreas (Doctoral thesis / Doktoravhandling, 2017)Mye av dagens høyteknologiske utstyr og apparater ville sannsynligvis ikke sett dagens lys hvis ikke det hadde vært for materialteknologiens stadige fremskritt. I jakten på stadige forbedringer av slik teknologi må man ...
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Bjørheim, Tor Svendsen; Løken, Andreas; Haugsrud, Reidar (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)In this contribution, we determine the compositional dependence of the chemical expansion and entropy of hydration of the proton conducting perovskites BaZrO3, BaSnO3, BaCeO3, and SrZrO3 by first principles phonon calculations. ...
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Løken, Andreas; Bjørheim, Tor Svendsen; Haugsrud, Reidar (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2015)The choice of acceptor has been demonstrated to result in distinctly different hydration properties in proton conducting perovskites such as BaZrO3 and BaCeO3 and may as such have significant implications for their proton ...
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Kalland, Liv-Elisif Queseth; Løken, Andreas; Bjørheim, Tor Svendsen; Haugsrud, Reidar; Norby, Truls Eivind (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)We have measured water uptake and hydration enthalpy in 50% La and Nd doped CeO2, also to be taken as compositions in the series La2−xNdxCe2O7 (x = 0.0, 0.5, 1.0 and 2.0) using combined thermogravimetry (TG) and differential ...
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Løken, Andreas (Master thesis / Masteroppgave, 2011)Correlations aimed at linking the hydration thermodynamics to materials parameters can be of vital importance for further development of proton conducting oxides. However, the currently proposed correlations are to a large ...
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Løken, Andreas; Haugsrud, Reidar; Bjørheim, Tor Svendsen (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)Differentiating chemical and thermal expansion is virtually impossible to achieve experimentally. While thermal expansion stems from a softening of the phonon spectra, chemical expansion depends on the chemical composition ...