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Synthesis and Structural Characterization by X‐ray Absorption Spectroscopy of Tin‐Doped Mullite Solid Solutions
Author(s) -
Caballero Alfonso,
Ocaña Manuel
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00379.x
Subject(s) - tin , mullite , x ray absorption spectroscopy , extended x ray absorption fine structure , xanes , calcination , amorphous solid , inorganic chemistry , materials science , doping , solid solution , absorption spectroscopy , spectroscopy , analytical chemistry (journal) , chemistry , crystallography , metallurgy , catalysis , ceramic , biochemistry , physics , optoelectronics , chromatography , quantum mechanics
The formation of solid solutions between tin cations and mullite by calcination at 1400°C of amorphous precursors prepared by pyrolysis of aerosols is reported. The oxidation state of the tin cations and the position that they occupy in the mullite structure have been analyzed using XAS (XANES and EXAFS) spectroscopy, which shows that the tetravalent tin cations are located at the octahedral positions of the Al 3+ ions, which induces cell expansion. The limit of tin incorporation under the experimental conditions reported here correspond to a tin/mullite mole ratio of ∼5%, which is within the range previously reported for other tetravalent cations (4%–6%).