Article (Scientific journals)
Phase-change materials and rigidity
Piarristeguy, A.; Pradel, A.; Raty, Jean-Yves
2017In MRS Bulletin, 42 (1), p. 45-49
Peer reviewed
 

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Keywords :
Te; Amorphous materials; Data storage equipment; Electric properties; Germanium; Glass; Monte Carlo methods; Rigidity; Tellurium; Ab initio; Aging behavior; Atomistic structure; Average numbers; Composition measurements; Mechanical constraints; Reverse Monte Carlo; Rigidity theories; Phase change materials
Abstract :
[en] Rigidity theory is an extraordinary tool to understand glasses. This article demonstrates how this model can help in understanding the link between structure, dynamics, and subtler properties such as drift and aging, in particular, in phase-change materials (PCMs). First, a map of flexible/rigid regions in the Ge-(Sb)-Te system is drawn on the basis of atomistic structures modeled either by ab initio or reverse Monte Carlo techniques. A clear link between the flexible/rigid nature of the glass and its aging behavior is shown through resistivity drift as a function of composition measurements in amorphous GexTe100-x. In the particular case of amorphous GeTe, application of rigidity theory indicates that the average number of mechanical constraints decreases during aging, making the glass less stressed-rigid. Finally, the stability of PCMs also depends on the topology of the materials. The increasing number of constraints in GeTe when doped with C or N results in increased stability of the PCM. © 2017 Materials Research Society.
Disciplines :
Physics
Author, co-author :
Piarristeguy, A.;  Institut Charles Gerhardt, Université de Montpellier, France
Pradel, A.;  Centre National de la Recherche Scientifique, Institut Charles Gerhardt, Université de Montpellier, France
Raty, Jean-Yves  ;  Université de Liège > Département de physique > Physique des solides, interfaces et nanostructures
Language :
English
Title :
Phase-change materials and rigidity
Publication date :
2017
Journal title :
MRS Bulletin
ISSN :
0883-7694
Publisher :
Cambridge University Press
Volume :
42
Issue :
1
Pages :
45-49
Peer reviewed :
Peer reviewed
Tags :
Tier-1 supercomputer
CÉCI : Consortium des Équipements de Calcul Intensif
Funders :
Tier-1
CÉCI - Consortium des Équipements de Calcul Intensif [BE]
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