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Journal Articles The Journal of physical chemistry Year : 2003

Distribution of Si and Al in Clintonites: A combined NMR and Monte Carlo Study.

Abstract

The distribution of silicon and aluminum atoms over the tetrahedral sheets of clintonites (aluminum-rich phyllosilicates 2:1) has been studied by 29Si and 27Al magic-angle-spinning NMR spectroscopies. According to the 29Si NMR spectra, no silicon atoms are present in adjacent tetrahedra; however, several environments have been detected in the 27Al NMR signal, proving that these aluminosilicates do not adhere to Loewenstein's rule. The atom distribution has been simulated by a Monte Carlo procedure. From the results of these simulations, a further dispersion of silicon atoms over the tetrahedral sheets has been found, indicating a homogeneous dispersion of the electrostatic charge over the phyllosilicate layers. In contrast, a maximum dispersion of charges must be discarded in the layers of studied clintonites. Finally, an analysis of structural factors controlling this kind of cation distribution is given.

Domains

Mineralogy

Dates and versions

hal-00069278 , version 1 (17-05-2006)

Identifiers

Cite

Jésus Sanz, C.P. Herrero, Jean-Louis Robert. Distribution of Si and Al in Clintonites: A combined NMR and Monte Carlo Study.. The Journal of physical chemistry, 2003, 107(33), pp.8337-8342. ⟨10.1021/jp030097m⟩. ⟨hal-00069278⟩
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