RT Journal Article
T1 Effect of Zn addition on the structure and electrochemical properties of codoped BaCe0.6Zr0.2Ln0.2O3-δ (Ln=Y, Gd, Yb) proton conductors
A1 Zamudio-García, Javier
A1 Porras-Vázquez, José Manuel
A1 Dos-Santos-Gómez, Lucía
A1 Losilla, Enrique R.
A1 Marrero-López, David
K1 Sinteriación
K1 Cerámica piezoeléctica
AB In this work, BaCe0.6Zr0.2Y0.2-xYbxO3-δ and BaCe0.6Zr0.2Gd0.2-xYbxO3-δ (x=0–0.20), proton conducting materialsare prepared by the freeze-drying precursor method. The sintering conditions were optimized by adding Zn(NO3)2·6H2O as sintering additive. The materials are thoroughly characterized by different structural and microstructuraltechniques, including X-ray diffraction, scanning and transmission electron microscopy, andthermogravimetric-differential thermal analysis. The addition of Zn favours the phase formation and densificationat lower sintering temperatures; however, it leads to the segregation of a Zn-rich secondary phase, withgeneral formula BaLn2ZnO5 (Ln˭Y, Gd and Yb), which is identified and quantified for the first time. All sampleswith Zn as sintering aid exhibit cubic structure; however, the samples without Zn crystallize with orthorhombicor cubic structure, depending on the composition and thermal treatment. The electrical properties are studied byimpedance spectroscopy. A deep analysis of the bulk and grain boundary contributions to the conductivity hasrevealed that the bulk conductivity remains almost unchanged along both series over Yb-doping; however, thegrain boundary resistance decreases. The highest conductivity values are found for the intermediate members ofboth series, BaCe0.6Zr0.2Y0.1Yb0.1O3-δ and BaCe0.6Zr0.2Gd0.1Yb1O3-δ, with 33 and 28 mS cm−1 at 750 °C, respectively.
PB Elsevier
YR 2018
FD 2018-05-02
LK https://hdl.handle.net/10630/20983
UL https://hdl.handle.net/10630/20983
LA eng
NO Zamudio-García, J., Porras-Vázquez, J., dos Santos-Gómez, L., Losilla, E., & Marrero-López, D. (2018). Effect of Zn addition on the structure and electrochemical properties of co-doped BaCe0.6Zr0.2Ln0.2O3-δ (Ln=Y, Gd, Yb) proton conductors. Ceramics International, 44(12), 14113–14121. https://doi.org/10.1016/j.ceramint.2018.05.010
NO Ministerio de Economía y Competitividad), MAT2016-77648-R
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026