abstract
Rare earth silicates with the structure of apatite are attracting considerable interest since they show oxygen ion conductivities higher than that of yttria-stabilized zirconia (YSZ) at moderate temperature. Based on the hydrothermal synthesis we presented a simple one step process for the direct preparation of the pure and the high crystalline nanosized rare earth silicates with the structure of apatite under a mild condition (230 degrees C). Since the preparation of the high crystalline silicon based rare earth apatites is performed at high temperature previously and accompanied by subsequent process of grinding, results of this work provide a promising alternative of the existing methodology. Furthermore, due to the relatively low temperature of the preparation of these materials, high doping of monovalent cation can be done, which was not achieved before. (C) 2010 Elsevier Inc. All rights reserved.
keywords
IONIC-CONDUCTIVITY; OXIDE; GD; SM; ND; CONDUCTORS; PR; LA; EU; DY
subject category
Chemistry
authors
Ferdov, S; Rauwel, P; Lin, Z; Ferreira, RAS; Lopes, A
our authors
Augusto Luís Barros Lopes
Assistant Professor
Maria Rute de Amorim e Sá Ferreira André
Full professor
Zhi Lin
Principal ResearcherGroups
G1 - Porous Materials and Nanosystems
G2 - Photonic, Electronic and Magnetic Materials
G3 - Electrochemical Materials, Interfaces and Coatings
acknowledgements
This work was supported by FCT, POCI2010, PTDC, FSE, and FEDER. S. Ferdov is on leave from the Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences.