Sol-gel synthesis of cubic Nb/Ta-doped SrCoO3-d by tartaric acid decomposition.

F.M. EROLES; A.D. MENZAQUE; W.J. PELÁEZ; V.C. FUERTES; D.G. LAMAS

Valparaíso

Congreso; III Reunión de la Asociación Latinoamericana de Cristalografía y I Encuentro de la AChCr.; 2018

Asociación Chilena de Cristalografía (AChCr).

Pioneer research on mixing ionic-electronic conducting (MIEC) cathodes for IT-SOFCs is focused on the search of perovskite-type structures that combine high tolerance to oxygen vacancies, electronic conductivity and electrochemical activity for oxygen reduction. Promising candidates to fulfill this role are SrCoO3-d?based perovskites, which are extensively studied [1-3]. To date, no wet chemistry method has been reported for the synthesis of cubic Nb/Ta-doped SrCoO3-d perovskites. Based on this context, the present study is focused on the synthesis of cubic SrCo0.9M0.1O3-d perovskites (with M= Nb5+ and Ta5+) at lower temperatures, synthesized by sol-gel synthesis using tartrate-precursor decomposition. The materials developed in this work were characterized with X-ray powder diffraction, thermal gravimetric analysis and spectroscopic measurements. The morphology and average particle size were investigated by FE-SEM analysis. The present study may provide a new strategy for the synthesis of MIEC materials as nanopowders at lower temperatures.References:1. T. Nagai, W. Ito, T. R. Sakon, Solid State Ion., 177, 3433-3444 (2007)2. Z. Q. Deng, W. Liu, C. S. Chen, H. Lu, W. S. Yang, Solid State Ion., 170, 187-190 (2004)3. P. Zeng, R. Ran, Z. Chen, W. Zhou, H. Gu, Z. Shao, S. Liu, J. Alloys Compd., 455, 465-470 (2008)