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Deconvolution method of $^{29}$Si MAS NMR spectra applied to homogeneous and phase separated lanthanum aluminosilicate glasses

Abstract : The structural and microstructural properties of both homogeneous and phase separated lanthanum aluminosilicate (La$_2$O$_3$-Al$_2$O$_3$-SiO$_2$ i.e. LaAS system) glasses were investigated. The microstructural observations and the structural characterization by X-ray Diffraction and by Nuclear Magnetic Resonance have highlighted the role of aluminum to favor a homogeneous vitreous aluminosilicate network by a high-level of Al/Si intermixing. A qualitative and simplified structure description is proposed from $^{29}$Si nuclear magnetic resonance spectra assignment according to Q$^n$(mAl) species by controlling the deviation of chemical parameters. According to this approach, a homogeneous distribution of non-bridging oxygen in the aluminosilicate network and Al-O-Al linkages are considered for homogeneous glasses with high Al/Si atomic ratio. Phase separated samples are characterized by a low Al/Si atomic ratio inducing spinodal or nucleation/growth phase separation according to the depolymerization level. Homogeneity degree of the samples is discussed according to the intermixing level between silicon tetrahedra and aluminum polyhedra as a function of the proportion of Q$^n$ and Q$^n$(mAl) species.
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https://hal.archives-ouvertes.fr/hal-01956709
Contributor : Dominique Massiot Connect in order to contact the contributor
Submitted on : Sunday, December 16, 2018 - 1:10:33 PM
Last modification on : Sunday, November 21, 2021 - 9:18:04 PM

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Babacar Diallo, Mathieu Allix, Emmanuel Véron, Vincent Sarou-Kanian, Isabelle Bardez-Giboire, et al.. Deconvolution method of $^{29}$Si MAS NMR spectra applied to homogeneous and phase separated lanthanum aluminosilicate glasses. Journal of Non-Crystalline Solids, Elsevier, 2019, 503-504, pp.352-365. ⟨10.1016/j.jnoncrysol.2018.10.026⟩. ⟨hal-01956709⟩

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