Local structure of hydrated nanocrystalline films of the proton conductor BaZr 1-x Sc x O 3-x/2 studied by infrared spectroscopy

Naumovska, ElenaChalmers tekniska högskola,Chalmers University of Technology (author)

We report results from a study of the local structure of hydrated nanocrystalline 2 μm films of the well known proton conductor BaZr1-xScxO3-x/2 with x = 0.45, 0.54 and 0.64, using infrared (IR) spectroscopy. The films were prepared by magnetron sputtering. Analysis of the IR spectra focused on the O–H stretching region (2000—3700 cm-1), which reveals the presence of several distinct O–H stretching bands for which the intensity and frequency of each band vary in an unsystematic manner with Sc concentration. The spectra for the two higher Sc concentrations, x = 0.54 and 0.64, exhibit a distinct, highly intense O–H stretching band centered at around 3400–3500 cm-1, which is assigned to relatively symmetric, weakly hydrogen-bonding, proton configurations. The spectrum for the lower Sc concentration, x = 0.45, does not feature such a band but a broader, weaker, O–H stretching band between approximately 2500 and 3700 cm-1, suggesting that the protons are more homogeneously distributed over a range of different local proton coordinations in this relatively weakly doped material. A comparison to the IR spectra of powder samples of similar compositions suggests that for x = 0.45, the spectra and proton coordination of films and powder samples are similar, whereas for x = 0.54 and 0.64, a larger fraction of protons seems to be located in weakly hydrogen-bonding proton configurations in the films compared to the respective powder samples.

Nzulu, Gabriel KofiLinköpings universitet,Linköping University (author)
Mazzei, Laura,1988Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mazzei (author)
le Febvrier, ArnaudLinköpings universitet,Linköping University (author)
Komander, KristinaUppsala universitet,Uppsala University (author)
Magnuson, MartinLinköpings universitet,Linköping University (author)
Wolff, MaxUppsala universitet,Uppsala University (author)
Eklund, PerLinköpings universitet,Linköping University (author)
Karlsson, Maths,1978Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)maths (author)
Chalmers tekniska högskolaLinköpings universitet (creator_code:org_t)

By the author/editor: Naumovska, Elena; Nzulu, Gabriel K ...; Mazzei, Laura, 1 ...; le Febvrier, Arn ...; Komander, Kristi ...; Magnuson, Martin; show more...; Wolff, Max; Eklund, Per; Karlsson, Maths, ...; show less...

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