Role of synthetic route on the transport properties of BaCe1−xYxO3 proton conductor
| Autor: | Cristina Tealdi, Marino Battagliarin, L. M. Doubova, Cecilia Mortalò, Lorenzo Malavasi, Rosalba Gerbasi, Gaetano Chiodelli, Monica Fabrizio, Simona Barison |
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| Rok vydání: | 2009 |
| Předmět: |
Arrhenius equation
Materials science Mechanical Engineering Doping Metals and Alloys Analytical chemistry Sintering Mineralogy Nanostructured materials Conductivity Dielectric spectroscopy symbols.namesake Mechanics of Materials visual_art Proton conductors Materials Chemistry visual_art.visual_art_medium symbols SOFC Ceramic Cerate Solid solution Proton conductor |
| Zdroj: | Journal of alloys and compounds 470 (2009): 477–485. doi:10.1016/j.jallcom.2008.03.011 info:cnr-pdr/source/autori:Chiodelli G.; Malavasi L.; Tealdi C.; Barison S.; Battagliarin M.; Doubova L.; Fabrizio M.; Mortalò C.; Gerbasi R./titolo:Role of synthetic route on the transport properties of BaCe1-xYxO3 proton conductor/doi:10.1016%2Fj.jallcom.2008.03.011/rivista:Journal of alloys and compounds/anno:2009/pagina_da:477/pagina_a:485/intervallo_pagine:477–485/volume:470 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2008.03.011 |
| Popis: | In this paper the role of the preparation route on the transport properties of the BaCe 1− x Y x O 3− δ solid solution with x = 0, 0.1, 0.15, and 0.2 has been studied. In particular, the samples were synthesized by means of the solid-state reaction and by a modified Pechini method. The effect of grain size on the sintering behaviour of the two samples batches was investigated by means of impedance spectroscopy and electron microscopy. It was found that a good sintering of the pellets can be achieved at 1250 °C for the samples prepared through the Pechini method. The ceramic route, even at higher temperatures, does not lead to good density values. The extensive conductivity measurements as a function of doping and gas environment (pure oxygen and argon + 10% H 2 + water) we carried out showed that the optimal Y-doping is around 15% and that a significant proton conductivity can be achieved for T lower than 500 °C. Above this temperature, the role of oxygen defects starts becoming relevant. Finally, the presence of a slope change in all the Arrhenius plots, irrespective to the gas environment, at about 450–500 °C was observed and qualitatively interpreted as due to a change in the nature of the main charge carriers involved. |
| Databáze: | OpenAIRE |
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