Please use this identifier to cite or link to this item:
http://hdl.handle.net/10261/21464
Share/Export:
![]() ![]() |
|
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Title: | Sintering, microstructural development, and electrical probismuth oxide as a sintering aidperties of gadolinia-doped ceria electrolyte with |
Authors: | Gil, Vanesa CSIC ORCID; Tartaj, Jesús CSIC; Moure Jiménez, Carlos CSIC; Durán Botia, Pedro | Keywords: | CeO2–Gd2O3 Sintering |
Issue Date: | 2006 | Publisher: | Elsevier | Citation: | Journal of the European Ceramic Society 26 (2006) 3161–3171 | Abstract: | A considerable reduction (≥250 ◦C) in the sintering temperature, enhancement of the sintering density, and a slight improvement of the electrical properties, can be achieved by using bismuth oxide in the range of 0.2 to 2 wt.%, as a sintering aid for gadolinia-doped ceria (GDC) ceramic electrolytes. Dilatometric experiment (CHR) and SEM observations indicate that a liquid phase-assisting sintering mechanism contributes to the improvement in sintering density for bismuth oxide concentrations exceeding 0.5 wt.%. The addition of small amount of Bi2O3 ≤0.5 wt.% also results in the achievement of highly dense ceramic bodies (≥99% of theoretical density) after sintering at 1200 ◦C for 4 h, which indicates that the addition of Bi2O3 to gadolinia-doped ceria promoted the sintering process by a cooperating volume diffusion-liquid phase-assisting mechanism. Based on the lattice constant data, the solid solubility limit of Bi2O3 in gadolinia-ceria is, probably, lower than 1.0 wt.%. Grain size also increased with increasing Bi2O3 content up to 0.5 wt.% and then it decreased with further addition of Bi2O3. The addition of the smaller amounts of bismuth oxide, i.e., ≤1.0 wt.% Bi2O3 slightly enhanced the total ionic electrical conductivity of the gadolinia-doped ceria electrolyte. The sintering temperature strongly influenced the electrical conductivity of the doped-GDC ceramics. The best sample was that containing 1.0 wt.% Bi2O3 sintered at 1400 ◦C for 2 h which had an ionic electrical conductivity of 4 Sm−1 at 700 ◦C, and an activation energy of 0.58 eV for the oxide-ion conduction process in air. | Publisher version (URL): | http://dx.doi.org/10.1016/j.jeurceramsoc.2005.09.068 | URI: | http://hdl.handle.net/10261/21464 | DOI: | 10.1016/j.jeurceramsoc.2005.09.068 |
Appears in Collections: | (ICV) Artículos |
Show full item record
Review this work
SCOPUSTM
Citations
62
checked on May 14, 2022
WEB OF SCIENCETM
Citations
59
checked on May 15, 2022
Page view(s)
382
checked on May 16, 2022
Google ScholarTM
Check
Altmetric
Dimensions
WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.