# 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.

## Key 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.