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Proton conductivity and low temperature structure of In-doped BaZrO3

Istaq Ahmed ; S-G Eriksson ; Elisabet Ahlberg ; Christopher S Knee ; Maths Karlsson (Institutionen för teknisk fysik) ; Aleksandar Matic (Institutionen för teknisk fysik) ; Dennis Engberg (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Lars Börjesson (Institutionen för teknisk fysik)
Solid State Ionics (0167-2738). Vol. 177 (2006), 26-32, p. 2357-2362 .
[Artikel, refereegranskad vetenskaplig]

The proton conductivity and structural features of In3+ substituted BaZrO3 samples, i.e., BaZr1−xInxO3−δ, were investigated. Rietveld analysis of low temperature (10 K) neutron powder diffraction data collected on as-prepared and deuterated samples confirmed cubic symmetry (space group Pm-3m) for all compositions. The level of oxygen vacancies refined in the as-prepared samples were in good agreement with the values expected to conserve charge neutrality, whilst an increase in oxygen occupancy, reflecting the incorporation of OD− species, was obtained for the deuterated materials. An expansion of the unit cell parameter, a, was observed as a function of In3+ doping as well as after the deuteration reaction. The conductivity of pre-hydrated and dry samples was measured using impedance methods. For 25% In-doped BaZrO3, the low T (300 °C) conductivity of the heating cycle of the dried sample was greater than that of the cooling cycle of the pre-hydrated sample indicating a greater number of protons in the nominally dry sample. In contrast, the conductivity values were similar at higher temperatures e.g. T > 500 °C where proton conduction is not dominant.

Nyckelord: Neutron diffraction; Structure; Proton conductor; Perovskite



Denna post skapades 2007-10-17. Senast ändrad 2017-10-11.
CPL Pubid: 54727

 

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Institutioner (Chalmers)

Institutionen för kemi (2001-2011)
Institutionen för teknisk fysik (1900-2015)
Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)

Ämnesområden

Kemi

Chalmers infrastruktur