Accardo, Grazia Audasso, Emilio Yoon, Sung Pil 2024-01-19T12:31:57Z 2024-01-19T12:31:57Z 2022-04-05 2022-03 0925-8388 https://pubs.kist.re.kr/handle/201004/115557 Microstructural and electrochemical investigations of tri-doped (Gd, Li and Bi) cerium oxide, with theoretical formula Ce0.8(1-x-y)Gd0.2(1-x-y)LixBiyO[1.9(1-x-y)+x/2+3y/2] (x = 0.02 or 0.03 and y = 0.03 or 0.02 and x + y = 0.05) were carried out by XRD, BET, SEM, Raman, and EIS analyses. According to the dilatometer analysis, the synergistic combination of lithium and bismuth promotes the reduction of sintering temperature down to 800-900 degrees C. A densification > 95% was achieved for the electrolytes sintered at 900 degrees C. Raman analysis, in agreement with XRD, demonstrated that the lithium and bismuth induced changes due to the growth of the topological disorder and a higher defectiveness provoked by doping. The high dopant concentration (5 mol%) is well distributed into the lattice and forms a complex network of defects that traps the oxygen vacancies and hence mobile ions promoting the ionic transport. As compared to a single (CGO) or a bi-doped system (BiCGO and LiCGO) an improvement of total conductivity was achieved at lower sintering temperature, with a maximum value for Ce0.76Gd0.19Li0.03Bi0.02O1.85 of 2.68.10(-3)-1.66.10(-1) S cm(-1) in temperature range of 400-800 degrees C. (C) 2021 Elsevier B.V. All rights reserved. English Elsevier BV Unravelling the synergistic effect on ionic transport and sintering temperature of nanocrystalline CeO2 tri-doped with Li Bi and Gd as dense electrolyte for solid oxide fuel cells Article 10.1016/j.jallcom.2021.162880 1 Journal of Alloys and Compounds, v.898 Journal of Alloys and Compounds 898 N scie scopus 000749541600001 2-s2.0-85120427938 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article ELECTRICAL-PROPERTIES CERIA ELECTROLYTE LITHIUM-OXIDE GRAIN-GROWTH CONDUCTIVITY MICROSTRUCTURE DENSIFICATION BEHAVIOR Ionic conduction Raman SOFC Triple-doped ceria Lithium Bismuth