Universal behavior of the apparent fragility in ultraslow glass forming systems.

ABSTRACT: Despite decades of studies on the grand problem of the glass transition the question of well-defined universal patterns, including the key problem of the previtreous behavior of the primary (structural) relaxation time, remains elusive. This report shows the universal previtreous behavior of the apparent fragility, i.e. the steepness index m_P (T > T_g) = d log₁₀τ(T)/d( T_g/T). It is evidenced that m_P(T) = 1(T - T*), for T → T_g and  T*= T_g - Δ T*. Basing on this finding, the new 3-parameter dependence for portraying the previtreous behavior of the primary relaxation time has been derived: τ(T) = C_Ω((T - T*)/T)^-Ω × [exp((T - T*)/T)]^Ω. The universality of obtained relations is evidenced

SUBMITTER: Drozd-Rzoska A 

PROVIDER: S-EPMC6497650 | biostudies-literature | 2019 May

REPOSITORIES: biostudies-literature