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Hydrothermal Synthesis and Properties of Ce1−xMxO2-δ(M = La, Bi, Sm, Pr, Tb) Solid Solutions

Published online by Cambridge University Press:  10 February 2011

M. Greenblatt ,
P. Shuk ,
W. Huang ,
S. Dikmen  and
M. Croft
M. Greenblatt
Affiliation:
Department of Chemistry, Rutgers, the State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854-8087, martha@rutchem.rutgers.edu
P. Shuk
Affiliation:
Department of Chemistry, Rutgers, the State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854-8087, martha@rutchem.rutgers.edu
W. Huang
Affiliation:
Department of Chemistry, Rutgers, the State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854-8087, martha@rutchem.rutgers.edu
S. Dikmen
Affiliation:
Department of Chemistry, Rutgers, the State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854-8087, martha@rutchem.rutgers.edu
M. Croft
Affiliation:
Department of Chemistry, Rutgers, the State University of New Jersey, 610 Taylor Rd, Piscataway, NJ 08854-8087, martha@rutchem.rutgers.edu
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Abstract

A systematic study of hydrothermally prepared Ce1−x,MxO2−δ, (M= Sm, Bi, Pr, Tb; x= 0-0.30) solid solutions, promising materials for application in solid oxide fuel cells and oxygen membranes is presented. Ultrafine particles of uniform crystallite dimension, ∼ 20 nm can be formed in 30 min. under hydrothermal conditions (260°C, 10 MPa). The small particle size (20-50 nm) of the hydrothermally prepared materials allows sintering of the samples into highly dense ceramics at 900-1350°C, significantly lower temperatures than 1600-1650°C required for samples prepared by solid state techniques. The solubility limit of Bi2O3, in CeO2, was determined to be around 20 mol. %. The maximum conductivity, σ600°C ∼ 4.4 × 10−3 S/cm with Ea = 1.01 eV, and σ600°C = 5.7 × 10−3 S/cm with Ea ≈ 0.9 eV was found at x= 0.20 and x= 0.17 for Bi and Sm, respectively. In the Ce-Pr/Tb oxide systems, in addition to the high oxide ion conductivity, electronic conductivity occurs through the hopping of small polarons by a thermally activated mechanism (electron hopping from the Pr3+/Tb3+ to a neighboring Pr4+/Tb4+ ion).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 548: Symposia EE – Solid State Ionics V , 1998 , 511
Copyright
Copyright © Materials Research Society 1999

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