SOL-GEL SYNTHESIS OF CUBIC Nb/Ta-DOPED SrCoO3-d BY TARTARIC ACID DECOMPOSITION

Valparaiso

Congreso; III REUNIÓN DE LA ASOCIACIÓN LATINOAMERICANA DE CRISTALOGRAFÍA; 2018

Asociacion Chilena de Cristalografia

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 studied1-3. 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.