Effect of Composition and Temperature on Volatilization of
from Borosilicate Glasses
from borosilicate glasses incorporated with different additives like Cs , ZnO , and BaO have been investigated
as a function of heating temperatures (900°C, 950°C, and 1000°C) and time. According to the lower CaO volatility, the sequence of the incorporated oxides is arrived as Cs < ZnO 2 B 3 < O < BaO .
It is confirmed that the volatilization of CaO occurred predominantly through diffusion controlled process. From the temperature‐dependence volatility profiles of Cs , the activation energy and frequency
factor was calculated and found to be in the range of 300–500 kJ/mol and 103–1012 cm2/s, lowest for Cs and highest for ZnO containing glasses. It was
found that the frequency factor and not the activation energy were controlling the CaO loss. The observed variations in the activation energy and frequency factor have been explained by a unique model structure and possible interactions of Cs
with different structural units formed due to incorporation of the different additives.
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Document Type: Research Article
Publication date: April 1, 2012