The thermal behavior of albite as observed by DTA

There is a range in the melting point of albite (Na2O-Al2O3-6SiO2) at 1 atm reported in the literature. An experimental evaluation of the melting point of albite was conducted using differential thermal analysis (DTA). A melting point of 1134 °C was determined by this method that is higher than the reported values. In the DTA method, continuous heating in a flowing gas atmosphere removes any volatiles formed by heating. It is suggested that the evaporation of soda (Na2O) during heating can lead to a raising of the melting point of albite.