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Göteborgs universitets publikationer

Short-range structure of proton-conducting perovskite BaInxZr1-xO3-x/2 (x=0-0

Författare och institution:
Maths Karlsson (Institutionen för teknisk fysik, Kondenserade materiens fysik, Chalmers); Aleksandar Matic (Institutionen för teknisk fysik, Kondenserade materiens fysik, Chalmers); Christopher S Knee (Institutionen för teknisk fysik, Kondenserade materiens fysik, Chalmers & Institutionen för kemi- och bioteknik, Oorganisk miljökemi, Chalmers); Istaq Ahmed (Institutionen för kemi); Sten G. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi, Chalmers); Lars Börjesson (Institutionen för teknisk fysik, Kondenserade materiens fysik, Chalmers)
Publicerad i:
Chemistry of Materials, 20 ( 10 ) s. 3480-3486
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
In a systematic study, we investigate the effect of dopant level and hydration on the short-range structure of the proton-conducting perovskite-type oxide BaInxZr1-xO3-x/2 (x = 0 - 0.75), using infrared and Raman spectroscopy. The results show that the doping leads to significant local distortions of the average cubic structure of these materials. By increasing the In concentration from x = 0 to x = 0.75, new bands appear and grow in intensity in both the IR and the Raman spectra, showing that the local distortions become successively more and more pronounced. The structural distortions are largely uncorrelated to the presence of oxygen vacancies, but instead are mainly driven by the size and charge difference between the In3+ and Zr4+ ions, which leads to displacements of the cations and to tilting of the (In/Zr)O-6 octahedra. On the basis of our results, we suggest that there is a threshold between x = 0.10 and x = 0.25 where the structural distortions propagate throughout the whole perovskite structure. Comparison of our spectroscopic data with the proton conductivity for the same materials indicates that the presence of extended structural distortions is favorable for fast proton transport.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Fysik ->
Den kondenserade materiens fysik
Materialteknik ->
Annan materialteknik ->
Funktionella material
Annan teknik ->
Övrig annan teknik ->
Materialfysik med ytfysik
Postens nummer:
Posten skapad:
2010-01-08 15:51
Posten ändrad:
2016-08-22 08:01

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