Relation Between Local STructure and Fragility of Lead Silicate Glasses

, 이상기; , Masahiro Tatsumisago; , Tsutomu Minami; , 이상기; , Masahiro Tatsumisago; , Tsutomu Minami

J. Korean Ceram. Soc. > Volume 33(6); 1996 > Article

Journal of the Korean Ceramic Society 1996;33(6): 617.

$PbO-SiO_2$ 계 유리의 국부구조와 Fragility의 관계

Relation Between Local STructure and Fragility of Lead Silicate Glasses

이상기 , Masahiro Tatsumisago ¹, Tsutomu Minami ¹

가야대학교 세라믹공학과
¹Dept of Applied Mater Sci Osaka prefecture Univ Japan

ABSTRACT

Viscosities and thermal properties of glasses in the system PbO-SiO2 were measured at a temperature region of glass transformation. The glass transition temperature values were decreased with an increase in the PbO content. The measures of fragility $Delta$Cp, and Eη/Tg where $Delta$Cp, Eη and Tg are respectively the heat capacity change in the glass transition the activation energy for viscous flow and the glass transition temperature were increased monotonously in the glasses with low PbO content(<50 mol%) The measures of fragility $Delta$Cp, and Eη/Tg did not change in the glasses with high PbO content(>50 mol%) As a results of these measure-ments a good correlation was observed between $Delta$Cp, and Eη/Tg in the system PbO-SiO2

Key words: Lead silicate glass, Glass transition temperature, Heat capacity, Viscosity, Fragility, Activation energy