Phase Separation and their Structures in <TEX>$BaO-B_2O_3$</TEX> Glasses

,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 23(6); 1986 > Article

Journal of the Korean Ceramic Society 1986;23(6): 25.

$BaO-B_2O_3$계 유리의 상분리 현상과 유리의 구조

채수철, 김철영

인하대학교 무기재료공학과

Phase Separation and their Structures in $BaO-B_2O_3$ Glasses

ABSTRACT

Phase spearated glass is heterogeneous in microscopic point of view and the heterogeneities affect the structures of glasses. In the present work the phase separation of $BaO-B_2O_3$ glass system was investigated and the effect of $P_2O_5$ on the phase separation and crystallization was also studied in the above system. Experiments such as scanning electron microscopy X-ray diffraction and infrared spectroscopy were performed. Phase separation with $B_2O_3$ rich phase matrix and BaO rich phase droplet was observed for the glasses containing less than 6 mole% of BaO while the opposite morphology of phase separation was found for the glasses containing more than 7 mole% of BaO. Phase separation region was extended up to the glass with 22mole% of BaO when the amount of $P_2O_5$ was increased. The heat-treated glasses crystallized to BaO.$4B_2O_3$$P_2O_5$ hindered the glass from the crystalli-zation.