Experimental Nonevidence of Fragile-to-Strong Crossover

TL;DR

This study examines the viscosity of Ge-Se glasses and finds no evidence of a fragile-to-strong crossover in any composition.

Contribution

The study provides experimental evidence against the fragile-to-strong crossover in Ge–Se glass-forming systems.

Findings

No fragile-to-strong crossover was observed in any of the four Ge–Se compositions.

Viscosity measurements spanned 13 orders of magnitude across different techniques.

Abstract

This study explores the viscosity behavior of the Ge–Se
chalcogenide glass-forming system. Four compositions containing 5,
10, 15, and 20 at. % germanium were examined. Viscosity measurements
were performed over a broad range, spanning approximately 13 orders
of magnitude, by combining the pressure-assisted melt filling technique
with penetration and parallel-plate viscometry. The results demonstrate
that no fragile-to-strong crossover occurs in any of the studied compositions.

Figures