Sub-Tg viscoelastic behaviour of chalcogenide glasses, anomalous viscous flow and stress relaxation

Guéguen, Yves; Sangleboeuf, Jean‐Christophe; Kéryvin, Vincent; Rouxel, Tanguy; King, Ellyn A.; Robin, Éric; Delaizir, Gaëlle; Bureau, Bruno; Zhang, Xianghua; Lucas, Pierre

doi:10.2109/jcersj2.116.890

Cited by 15 publications

(14 citation statements)

References 27 publications

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“…This causes a significant increase in η of the annealed glass. Such an increase in η upon thermal treatment has been demonstrated experimentally in fast‐quenched chalcogenide systems such as infrared fibers . Given that crystal growth velocity v and nucleation rate I are both inversely proportional to η, an increase in crystallization time (Figure S7, Supporting Information) and in T p then ensues (Figure ; Figure S9, Supporting Information).…”

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confidence: 66%

Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge₂Sb₂Te₅

et al. 2019

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Controlling crystallization kinetics is key to overcome the temperature–time dilemma in phase change materials employed for data storage. While the amorphous phase must be preserved for more than 10 years at slightly above room temperature to ensure data integrity, it has to crystallize on a timescale of several nanoseconds following a moderate temperature increase to near 2/3 Tm to compete with other memory devices such as dynamic random access memory (DRAM). Here, a calorimetric demonstration that this striking variation in kinetics involves crystallization occurring either from the glassy or from the undercooled liquid state is provided. Measurements of crystallization kinetics of Ge2Sb2Te5 with heating rates spanning over six orders of magnitude reveal a fourfold decrease in Kissinger activation energy for crystallization upon the glass transition. This enables rapid crystallization above the glass transition temperature Tg. Moreover, highly unusual for glass‐forming systems, crystallization at conventional heating rates is observed more than 50 °C below Tg, where the atomic mobility should be vanishingly small.

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confidence: 66%

Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge₂Sb₂Te₅

et al. 2019

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“…Moreover, these measurements were performed on a freshly drawn fiber and measuring the viscosity of a fresh glass involves a high uncertainty because the viscosity increases throughout the creep test due to natural enthalpy relaxation. 30,31 Nevertheless, using the slope of the curve plotted in Fig. 2, the following shear viscosities can be estimated: 5 ϫ 10 15 Pa s under irradiation and 4 ϫ 10 16 Pa s in the dark.…”

Section: B Resultsmentioning

confidence: 99%

Photoinduced fluidity in chalcogenide glasses at low and high intensities: A model accounting for photon efficiency

Guéguen

Sangleboeuf²,

Kéryvin³

et al. 2010

Phys. Rev. B

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“…Ge-Se [95,96,97], Te-As-Ge [98], As-Ge-Se [99], that can be related to structural aspects, while also revealing that a significant part of the stress does not release on experimental timescales (months) in certain compositions for given systems (e.g. GeSe 4 in Ge-Se [96]). Such stress relaxation measurements have some importance in field of ion exchange glasses (e.g.…”

Section: Stress Relaxationmentioning

confidence: 99%

Relaxation and physical aging in network glasses: a review

Micoulaut

2016

Rep. Prog. Phys.

100

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Abstract. Recent progresses in the description of glassy relaxation and ageing are reviewed for the wide class of network-forming materials such as GeO 2 , Ge x Se 1−x , silicates (SiO 2 -Na 2 O) or borates (B 2 O 3 -Li 2 O), all of them having an important usefulness in domestic, geological or optoelectronic applications. A brief introduction of the glass transition phenomenology is given, together with the salient features that are revealed both from theory and experiments. Standard experimental methods used for the characterization of the slowing down of the dynamics are reviewed. We then discuss the important role played by aspect of network topology and rigidity for the understanding of the relaxation of the glass transition, while also permitting analytical predictions of glass properties from simple and insightful models based on the network structure. We also emphasize the great utility of computer simulations which probe the dynamics at the molecular level, and permit to calculate various structure-related functions in connection with glassy relaxation and the physics of ageing which reveals the off-equilibrium nature of glasses. We discuss the notion of spatial variations of structure which leads to the picture of "dynamic heterogeneities", and recent results of this important topic for network glasses are also reviewed.PACS numbers: 61.43. Fs, 64.70.kj Relaxation and physical ageing in network glasses 2 Figure 1. Typical network-forming glasses: a) A stoichiometric glass former (SiO 2 , B 2 S 3 ) whose structure and network connectivity can be altered by the addition (b) of 2-fold coordinated atoms (usually chalcogens, S, Se) that lead to cross-linked chains. The structure can also be depolymerized (c) by the addition of a network modifier (alkali oxides or chalcogenides, Na 2 O, Li 2 S, etc.). Glassy dynamics depends strongly on the network topology, i.e. the way bonds and angles arrange to lead to a connected atomic network. Note that only chalcogenides can produce a mixture of these three kinds of basic networks, e.g. (1-x)Ge y Se 1−y -xAg 2 Se [2], and for the latter system x=0 corresponds to case (b), y=33% corresponds to case (c), and both conditions together (x=0,y=33 %) to case (a).

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Sub-Tg viscoelastic behaviour of chalcogenide glasses, anomalous viscous flow and stress relaxation

Cited by 15 publications

References 27 publications

Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge₂Sb₂Te₅

Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge₂Sb₂Te₅

Photoinduced fluidity in chalcogenide glasses at low and high intensities: A model accounting for photon efficiency

Relaxation and physical aging in network glasses: a review

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Sub-Tg viscoelastic behaviour of chalcogenide glasses, anomalous viscous flow and stress relaxation

Cited by 15 publications

References 27 publications

Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge2Sb2Te5

Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge2Sb2Te5

Photoinduced fluidity in chalcogenide glasses at low and high intensities: A model accounting for photon efficiency

Relaxation and physical aging in network glasses: a review

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Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge₂Sb₂Te₅

Switching between Crystallization from the Glassy and the Undercooled Liquid Phase in Phase Change Material Ge₂Sb₂Te₅