The structural role of alumina in alkali phosphosilicate glasses: a multinuclear solid state NMR study
In this report we present a study of the structural role of aluminium incorporation into phosphosilicate glasses containing sixfold coordinate silicon and the evolution of the structure at high temperatures. The organization of the glass network was analyzed employing advanced NMR approaches (REDOR (rotational echo double resonance) and REAPDOR (rotational echo adiabatic passage double resonance) NMR spectroscopy) allowing us to analyze structural motifs on short (1–2 Å) and intermediate (2–5 Å) length scales as well as in situ MAS (magic angle spinning) spectroscopy using a novel high temperature setup. The added Al is competing with Si for connections to phosphate polyhedra. The total number of sixfold coordinate network former cations is found to correlate with the evolution of the glass transition temperature in the two glass series studied.
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Document Type: Research Article
Publication date: December 1, 2018