University of PardubiceFaculty of Chemical Technology

University

Employees
|
Students
Česky

Publication detail

Viscosity and crystal growth kinetics in GeSe2 amorphous chalcogenide glass

Authors: Vaculík David | Barták Jaroslav | Košťál Petr

Year: 2025

Type of publication: ostatní - přednáška nebo poster

Page from-to: nestránkováno

Titles:

Language	Name	Abstract	Keywords
eng	Viscosity and crystal growth kinetics in GeSe2 amorphous chalcogenide glass	The viscosity properties of amorphous bulk samples were studied using two methods: the thermomechanical analysis (TMA) and the nanoindentation (NI), and the obtained viscosity data were then described by the MYEGA viscosity model. The amorphous glass was annealed either ex-situ, in a furnace, or in-situ in a computer-programmable heating stage. The growing crystals were observed under an infrared microscope, which revealed two temperature modifications that differ in growth rate and shape of crystals. The crystal growth rate was calculated from the change in length over time. The dependency of crystal growth rate on temperature was described by a proper kinetic growth model, which was further enhanced with the use of the decoupling parameter ξ, describing the deviation from the Stokes-Einstein relation. The effective diffusion of structural units was described and compared with published data.	Viscosity; crystal growth; kinetics; GeSe2; amorphous; chalcogenide; glass