A NEW CRITERION FOR THE STABILITY OF GLASSES

A new criterion for the stability of glasses, k(D)(T), k(D)(T)=nu.exp (-E/RT.D), where D=T-c(T-p-T-c)/T-l(T-l-T-g), was proposed, which incl uded both the kinetic factor and the thermodynamic factor by means of bringing the correction factor, D, into the crystallization kinetic pa rameter, k(T), k(T)=nu exp (-E/RT) The lower the value of k(D)(T), the more stable glass. The new criterion, k(D)(T), was not influenced by the heating rate of differential thermal analysis (DTA). Especially wh en the values of frequency factor nu of glasses were near, the new cri terion, k(D)(T), could accurately determine the stability of the glass es. The correctness of the new criterion, k(D)(T), had been verified t hrough being used in the CaO-Al2O3-SiO2 system glasses and the Nd dope d fluorozirconate glasses. (C) 1998 Elsevier Science Limited. All righ ts reserved.