Quasielastic neutron scattering of hydrated BaZr0.90A0.10O2.95 (A = Y and Sc)
Artikel i vetenskaplig tidskrift, 2009

Proton motions in hydrated proton conducting perovskites BaZr 0.90 A 0.10 O 2.95 (A = Y and Sc) have been investigated using quasielastic neutron scattering. The results reveal a localized motion on the ps time scale and with an activation energy of ~ 10-30 meV, in both materials. The temperature dependence of the total mean square displacement of the protons shows an onset of this motion at a temperature of about 300 K. The low activation energy, much lower than the activation energy for the macroscopic proton conductivity, suggests that this motion is not the rate-limiting process for the long-range proton diffusion, i.e. it is not linked to the two materials significantly different proton conductivities. In fact, a comparison of the QENS results with density functional theory calculations indicates that for both materials the observed motion may be ascribed to intra-octahedral proton transfers occurring close to a dopant atom. © 2008 Elsevier B.V. All rights reserved.

Författare

Maths Karlsson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Aleksandar Matic

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Dennis Engberg

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Mårten Björketun

Chalmers, Teknisk fysik, Material- och ytteori

M. Koza

Institut Laue-Langevin

Istaq Ahmed

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Göran Wahnström

Chalmers, Teknisk fysik, Material- och ytteori

Lars Börjesson

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Sten Eriksson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Solid State Ionics

0167-2738 (ISSN)

Vol. 180 1 22-28

Ämneskategorier

Fysik

DOI

10.1016/j.ssi.2008.11.004