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Topological Phases of Chalcogenide Glasses Encoded in the Melt Dynamics (Phys. Status Solidi B 6/2018)
Author(s) -
Boolchand Punit,
Bauchy Mathieu,
Micoulaut Matthieu,
Yildirim Can
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201870122
Subject(s) - fragility , glass transition , chalcogenide , amorphous solid , materials science , relaxation (psychology) , chalcogenide glass , thermodynamics , crystallography , chemistry , physics , polymer , composite material , metallurgy , psychology , social psychology
As a melt cools to form a glass, could it be that melt dynamics encode the glass topological phases? This question is addressed by Punit Boolchand and co‐workers in article no. 1800027 . Select Raman scattering and calorimetric experiments, on specially homogenized binary Ge x Se 100–x and Ge x S 100–x glasses show that, in each chalcogenide glass system, the melt fragility index ( m ) displays a minimum ( m < 20) in the 20% < x < 26% compositional range – the fragility window . Enthalpy of relaxation (Δ H nr ) at the glass transition temperature ( T g ) in each glass system displays a square‐well‐like behavior with Δ H nr ~ 0, in the same 20% < x < 26% composition range – the reversibility window . The correlation between fragility and reversibility windows suggests that melt dynamics determine the glass topological phases, a feature that could be generic in glass science. This article is part of the special section on “Amorphous and Nanostructured Chalcogenides”, comprising 5 articles in this issue of pss(b) and guest‐edited by Mihai Popescu.