Spiridigliozzi, L. Accardo, G. Audasso, E. Yoon, S. P. Dell'Agli, G. 2024-01-19T08:32:50Z 2024-01-19T08:32:50Z 2023-07-06 2023-10 0925-8388 https://pubs.kist.re.kr/handle/201004/113246 Several orthorhombic perovskite products with nominal chemical formula BaCe0.85Gd0.15O3-& delta; (BCGO), doped with variable amounts (0-5 mol%) of CuO and characterized by high total ionic conductivities, were synthesized by a sol-gel method followed by a calcination step at 1200 & DEG;C to induce the formation of a perovskite single phase. The products were characterized by X-ray Diffraction (XRD), Rietveld refinement, Scanning Electron Microscopy (SEM), Raman spectroscopy and Electrochemical Impedance Spectroscopy analysis (EIS). The powders were sintered into highly dense bodies (greater than 99 % for the best sample) through a relatively mild sintering process, i.e. 1350 & DEG;C for 6 h. The positive effect of copper as a sintering aid was revealed when a threshold content value (around 2 mol%) was e. Indeed, beyond such a limit, by calcination at 1200 & DEG;C, a secondary phase, a mixed oxide of Cu, Ba and Gd (very likely with chemical formula GdBa4Cu3O9.18) appears in the precursor powders strongly enhancing the densification process, reasonably via partial liquid-phase sintering. Finally, remarkable grain growth also occurred, enhancing the overall conductivity of BCGO due to the positive effect of the reduction of grain boundary dimensions.& COPY; 2023 Elsevier B.V. All rights reserved. English Elsevier BV On the role of copper as a sintering aid in proton conducting Gd-doped barium cerate (BCGO) Article 10.1016/j.jallcom.2023.170762 1 Journal of Alloys and Compounds, v.960 Journal of Alloys and Compounds 960 N scie scopus 001011641900001 2-s2.0-85160671632 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article PHASE-TRANSITIONS TEMPERATURE POWDERS BACEO3 MICROSTRUCTURE DIFFRACTION ADDITIVES CUO Barium cerate Sintering aid Proton conductors Copper Combustion synthesis