Artículos de revistas
EXAFS and XRD Study of the Structural Evolution during Isothermal Sintering of SnO2 Xerogels
Fecha
1997-12-01Registro en:
Journal of Sol-Gel Science and Technology, v. 8, n. 1-3, p. 269-274, 1997.
0928-0707
10.1023/A:1026410313051
WOS:A1997WQ33400042
2-s2.0-0030719070
9971202585286967
5584298681870865
0000-0002-8356-8093
Autor
Universidade Estadual Paulista (Unesp)
Institución
Resumen
The formation of an ordered (crystalline) phase during isothermal sintering of SnO2 monolithic xerogels, at 200, 250, 300, 400, 500, 600 and 700°C, has been analyzed by the combined use of EXAFS and XRD techniques. For the desiccated gel (110°C), EXAFS results show the formation of small microcrystallites with the incipient cassiterite structure. Between 110 and 250°C, the dehydratation reaction leads to an amorphization evidenced by a decrease of the long and short range crystallographic order. It is due to fissure formation in the xerogel network. For higher temperatures, a continuous coagulation of the crystallites occurs, leading to grain growth. Grain and pore growth obeys the same kinetic relation, so that the microstructure grows by simple enlargement while its morphology is static.