Artigo
Studies on structural, morphological and electrical properties of Ce1-xErxO2-delta (x=0.05-0.20) as solid electrolyte for IT - SOFC
Registro en:
Materials Chemistry And Physics, v. 153, p. 422-431, 2015.
0254-0584
10.1016/j.matchemphys.2015.01.036
WOS:000349505700054
Autor
Stojmenovic, M.
Boskovic, S.
Zunic, Milan [UNESP]
Babic, B.
Matovic, B.
Bajuk-Bogdanovic, D.
Mentus, S.
Resumen
A series of four different powders ceria doped Ce1-xErxO2-delta (0.05 <= x <= 0.20) were synthesized by applying self-propagating reaction at room temperature (SPRT method). SPRT procedure is based on the self-propagating room temperature reaction between metal nitrates and sodium hydroxide, wherein the reaction is spontaneous and terminates extremely fast. The method is known to assure very precise stoichiometry of the final product in comparison with a tailored composition. XRPD, Raman spectroscopy, TEM and BET measurements were used to characterize the nanopowders at room temperature. It was shown that all obtained powders were single phase solid solutions with a fluorite-type crystal structure and all powder particles have nanometric size (about 3-4 nm). Densification was performed at 1550 degrees C, in an air atmosphere for 2 h. XRPD, SEM and complex impedance method measurements were carried out on sintered samples. Single phase form was evidenced for each sintered materials. The best value of conductivity at 700 degrees C amounted to 1.10 x 10(-2) Omega(-1) cm(-1) for Ce0.85Er0.O-3(2-delta) sample. Corresponding activation energies of conductivity amounted to 0.28 eV in the temperature range 500-700 degrees C. (C) 2015 Elsevier B.V. All rights reserved. Ministry of Education, Science, and Technological Development of Serbia A.von Humboldt foundation Univ Belgrade, Inst Nucl Sci Vinca, Belgrade, Serbia Univ Belgrade, Inst Multidisciplinary Res, Belgrade 11030, Serbia UNESP LIEC, CMDMC, Inst Quim, BR-14800900 Araraquara, SP, Brazil Univ Belgrade, Fac Phys Chem, Belgrade 11158, Serbia Serbian Acad Arts &Sci, Belgrade 11000, Serbia UNESP LIEC, CMDMC, Inst Quim, BR-14800900 Araraquara, SP, Brazil Ministry of Education, Science, and Technological Development of Serbia: III 45012 Ministry of Education, Science, and Technological Development of Serbia: III 45014 Ministry of Education, Science, and Technological Development of Serbia: III 45007