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Short-range structure of proton-conducting BaM0.10Zr0.90O2.95 (M = Y, In, Sc and Ga) investigated with vibrational spectroscopy

M. Karlsson ; Istaq Ahmed (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Aleksandar Matic (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Sten G. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi)
Solid State Ionics (0167-2738). Vol. 181 (2010), 3-4 (Sp. Iss.), p. 126-129.
[Artikel, refereegranskad vetenskaplig]

The short-range structures of hydrated and dry samples of the proton-conducting, cubic-structured, acceptor-doped perovskites BaM0.10Zr0.90O2.95 (M=Y, In, Sc and Ga), and, for comparison, BaZrO3, have been investigated using infrared and Raman spectroscopy. The results show that the acceptor-doping leads to local structural distortions of the average cubic structure, most likely related to tilts of (M/Zr)O-6 octahedra, and that the distortions are most pronounced in the Ga-doped material for which we also find additional distortions upon hydration. For the Y-, In- and Sc-doped equivalents the distortions are somewhat weaker and hydration is found to have a reversed, although weak, effect. A comparison of the spectroscopic results to the reported proton diffusivities of the investigated materials would suggest that the much lower proton diffusivity in the Ga-doped material is associated to its stronger structural distortions. (C) 2009 Elsevier B.V. All rights reserved.

Nyckelord: Proton-conducting, Perovskite, Raman spectroscopy, Infrared spectroscopy, CHARGE-CARRIERS, PEROVSKITES, OXIDES

Denna post skapades 2010-05-20. Senast ändrad 2015-12-17.
CPL Pubid: 121761


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)
Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)



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