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Electric fields have been shown by a combined DTA-electrolysis technique to decrease the temperature of the exothermic devitrification of aluminosilicate glasses derived from kaolinite by up to 30% A layer of extremely crystalline alkali aluminium silicate is formed at the cathode as a result of migration of alkali metal ions to that electrode, underlying this is a region containing mullite and a high concentration of bubble-like voids. The distribution of AI and Si is unchanged by electrolysis. These results are interpreted in terms of an electrolysis mechanism involving co-operative migration of alkali metal ions and protons to the cathode. An observed lowering of the heat of devitrification by the electric field is ascribed to a decrease in entropy of the electrolysed system.The advent of glass-ceramics has led to considerable interest in nucleation and phase separation phenomena in many glassy solids, including the binary system A1203-SiO2 [1 ]. Since a knowledge of the factors which control the devitrification process is of both practical and theoretical importance, much recent research has been directed toward systems which display metastable liquid immiscibility; such systems include AlcOa-SiO~.As phase separation in another glass-forming system (CaO-A120 3-SiO2-MgO) has been found to be influenced by applied DC electric fields [2] and such fields are also known to assist formation of mullite and cristobalite in crystalline aluminosilicates [3 ], the present study was undertaken to determine whether devitrification of an aluminosilicate glass can be controlled by solid state electrolysis.The glass used in this study was made from dehydroxylated kaolinite, and has the composition 46.26 wt. ~ A1203 (33.56 tool ~ AlzOz), 48.00 wt. ~ SiO2. This composition falls within the range of metastable liquid immiscibility of the system [1] and corresponds to a composition which separates apparently by a spinodal mechanism rather than the classical mechanisms of nucleation and growth [1 ].The chief experimental technique used in this study was DTA which gave both a measurement of the devitrification temperature under various electrolysis conditions and an estimate of the heat evolved in the devitrification reaction. The reactant and product phases were investigated by X-ray diffractometry, i.r. spectrophotometry and electron microprobe analysis.
Electric fields have been shown by a combined DTA-electrolysis technique to decrease the temperature of the exothermic devitrification of aluminosilicate glasses derived from kaolinite by up to 30% A layer of extremely crystalline alkali aluminium silicate is formed at the cathode as a result of migration of alkali metal ions to that electrode, underlying this is a region containing mullite and a high concentration of bubble-like voids. The distribution of AI and Si is unchanged by electrolysis. These results are interpreted in terms of an electrolysis mechanism involving co-operative migration of alkali metal ions and protons to the cathode. An observed lowering of the heat of devitrification by the electric field is ascribed to a decrease in entropy of the electrolysed system.The advent of glass-ceramics has led to considerable interest in nucleation and phase separation phenomena in many glassy solids, including the binary system A1203-SiO2 [1 ]. Since a knowledge of the factors which control the devitrification process is of both practical and theoretical importance, much recent research has been directed toward systems which display metastable liquid immiscibility; such systems include AlcOa-SiO~.As phase separation in another glass-forming system (CaO-A120 3-SiO2-MgO) has been found to be influenced by applied DC electric fields [2] and such fields are also known to assist formation of mullite and cristobalite in crystalline aluminosilicates [3 ], the present study was undertaken to determine whether devitrification of an aluminosilicate glass can be controlled by solid state electrolysis.The glass used in this study was made from dehydroxylated kaolinite, and has the composition 46.26 wt. ~ A1203 (33.56 tool ~ AlzOz), 48.00 wt. ~ SiO2. This composition falls within the range of metastable liquid immiscibility of the system [1] and corresponds to a composition which separates apparently by a spinodal mechanism rather than the classical mechanisms of nucleation and growth [1 ].The chief experimental technique used in this study was DTA which gave both a measurement of the devitrification temperature under various electrolysis conditions and an estimate of the heat evolved in the devitrification reaction. The reactant and product phases were investigated by X-ray diffractometry, i.r. spectrophotometry and electron microprobe analysis.
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