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Article Dans Une Revue Thin Solid Films Année : 1992

EXPERIMENTAL-STUDY OF SI-GE TETRAHEDRAL SOLID-SOLUTION IN NI-CO-MG TALCS

S Petit
A Decarreau
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O Grauby
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Résumé

In order to study Si-Ge substitutions, Six-Ge1-x talcs (0 < x < 100) were synthesized at 200-degrees-C with various octahedral (nickel, cobalt or magnesium) cations. X-ray diffraction (XRD) reveals, in spite of different silicon and germanium cation sizes, preservation of the usual C1BAR lattice symmetry group of silicon talcs for germanium talcs. An increase in the cell volume and a rotation of tetrahedra (to adjust tetrahedral and octahedral lateral sheet dimensions) are observed for Si-Ge talcs when the germanium content increases. Fourier transform IR (FTIR) spectroscopy reveals, with increasing germanium content, a continuous evolution of band positions towards lower frequencies, indicating a tetrahedral solid solution. According to XRD and FTIR results, germanium can easily substitute for silicon on the tetrahedral sheet of clay minerals.

Dates et versions

hal-01424699 , version 1 (02-01-2017)

Identifiants

Citer

F Martín, S Petit, A Decarreau, O Grauby, Jl Hazemann, et al.. EXPERIMENTAL-STUDY OF SI-GE TETRAHEDRAL SOLID-SOLUTION IN NI-CO-MG TALCS. Thin Solid Films, 1992, 222 (1-2), pp.189-195. ⟨10.1016/0040-6090(92)90066-K⟩. ⟨hal-01424699⟩
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