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In-situ conductivity and hydration studies of proton conductors using neutron powder diffraction

Francis G. Kinyanjui (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Stefan T. Norberg (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Istaq Ahmed (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Sten G. Eriksson (Institutionen för kemi- och bioteknik, Oorganisk miljökemi) ; Stephen Hull
Solid State Ionics (0167-2738). Vol. 225 (2012), p. 312-316.
[Artikel, refereegranskad vetenskaplig]

An impedance spectroscopy cell and humidifier system has been developed to study the ion conducting properties and hydration/dehydration reactions in-situ during neutron powder diffraction experiments. As a model system, acceptor doped barium zirconate, BaZr0.5In0.5O2.75, has been studied during in-situ hydration and dehydration. Rietveld refinement of the collected data shows an increase in lattice parameter, a, upon hydration of BaZr0.5In0.5O2.75. In addition, we show the existence of a two-phase region, containing deuterated and non-deuterated barium zirconate, in the temperature interval ~ 573 K to ~ 873 K. Impedance spectroscopy data collected in-situ on heating and cooling and the corresponding ionic conductivity agree well with the change in deuteron content, as determined from neutron diffraction as a function of temperature. The newly developed in-situ cells make it possible to correlate conducting properties to structural changes under identical conditions and will have applicability to many other proton conducting solids.

Nyckelord: In-situ neutron diffraction, Proton conductor, Impedance spectroscopy, Hydration



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Denna post skapades 2013-02-05. Senast ändrad 2015-07-03.
CPL Pubid: 172981

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Oorganisk miljökemi (2005-2014)

Ämnesområden

Energi
Materialvetenskap
Keramteknik

Chalmers infrastruktur

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