Investigation of proton conductivity in Sm1.92Ca0.08Ti2O7 − δ and Sm2Ti1.92Y0.08O7 − δ pyrochlores
Artikel i vetenskaplig tidskrift, 2010

The results of the synthesis and characterisation of pyrochlore systems Sm1.92Ca0.08Ti2O7 − δ and Sm2Ti1.92Y0.08O7 − δ are reported. The electrical conductivity of the materials was studied using impedance spectroscopy under wet and dry oxygen and argon. Enhancements of the bulk conductivity at temperatures up to 500 °C were observed for wet conditions indicative of significant proton conductivity. The presence of dissolved protons in the materials is supported by thermogravimetric analysis and infrared spectroscopy. Proton conduction was confirmed by measurements in O2/D2O and Ar/D2O. The results reveal the importance of the correct choice of dopant site for the pyrochlore structure, with A-site substitution yielding the highest levels of proton, as well as oxide ion, conduction. For both samples bulk, rather than grain boundary, conduction is found to be dominant.

Pyrochlore

Ionic conductivity

Impedance spectroscopy

Sm2Ti2O7

Infrared spectroscopy

Författare

Karinh Eurenius

Göteborgs universitet

Elisabet Ahlberg

Göteborgs universitet

Istaq Ahmed

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Sten Eriksson

Chalmers, Kemi- och bioteknik, Oorganisk miljökemi

Christopher Knee

Göteborgs universitet

Solid State Ionics

0167-2738 (ISSN)

Vol. 181 3-4 148-153

Ämneskategorier

Kemi

DOI

10.1016/j.ssi.2009.05.004