resumo
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.
palavras-chave
IONIC-CONDUCTIVITY; OXIDE; GD; SM; ND; CONDUCTORS; PR; LA; EU; DY
categoria
Chemistry
autores
Ferdov, S; Rauwel, P; Lin, Z; Ferreira, RAS; Lopes, A
nossos autores
Augusto Luís Barros Lopes
Professor Auxiliar
Maria Rute de Amorim e Sá Ferreira André
Professor Catedrático
Zhi Lin
Investigador PrincipalGrupos
G1 - Materiais Porosos e Nanossistemas
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G3 - Materiais Eletroquímicos, Interfaces e Revestimentos
agradecimentos
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.