Artículos de revistas
Probing the thermal decomposition process of layered double hydroxides through in situ Fe-57 Mossbauer and in situ X-ray diffraction experiments
Registro en:
Journal Of Materials Science. Springer, v. 42, n. 2, n. 534, n. 538, 2007.
0022-2461
WOS:000243925700014
10.1007/s10853-006-1143-z
Autor
Gouveia, DX
Ferreira, OP
Souza, AG
da Silva, MG
de Paiva, JAC
Alves, OL
Mendes, J
Institución
Resumen
The thermal decomposition properties of Mg-Fe hydrotalcites were studied through in situ Fe-57 Mossbauer spectroscopy and in situ X-ray diffraction. Abrupt changes in the quadrupolar splitting measured in the Mossbauer spectra revealed a phase transition from the starting lamellar structure to a new crystalline arrangement. By analyzing the Mossbauer parameters we show that the material is highly disordered in the 300-400 degrees C temperature range. This hypothesis is confirmed by the X-ray results whose diffractograms indicated the collapse of the lamellar structure and the formation of a solid solution. 42 2 534 538