Aluminosilicate glasses transition temperatures

Figure 8.27 Heat capacity of some glass-forming liquids close to their glass transition temperatures ZnCl2 [45], GeSe2 [46], and a selected titanosilicate [47], aluminosilicate [48] and borosilicate [49] system.

Wang and co-workers [a.278] reported that the thermal degradation properties of a chromophore were significantly enhanced due to intercalation into the layered aluminosilicate saponite, and also that the glass transition temperature of (chromophore) -... 

Figure 8.11. Young s modulus at 293 K (exceptfor amorphous ice T=77K is considered) and glass transition temperature of glasses. TAS and 2S2G standfor TesAs es and Gafje2ifb 11 65 respectively. E and R glasses are high strength industrial aluminosilicate glasses...

Several of the well-known polymorphic structural phase transitions that occur in minerals at low to moderate temperatures, particularly in framework aluminosilicates, have since been studied by NMR techniques a brief review of these studies is provided here. Also included is a review of NMR studies of quenchable cation ordering reactions, which further illustrate the types of information on mineral transformations available from NMR experiments. NMR spectroscopy has also been used extensively to study glass transitions and glass-to-liquid transitions, which have been recently reviewed by Stebbins (1995b). We begin with a brief description of NMR spectroscopy, focusing on those aspects that are most useful for studying transitions in minerals... 

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