Mean-coordination number dependence of the fragility in Ge–Se–In glass-forming liquids

Saffarini, G.; Saiter, Allisson; Garda, Marie-Rose; Saiter, Jean‐Marc

doi:10.1016/j.physb.2006.06.163

Cited by 24 publications

(9 citation statements)

References 33 publications

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“…While, the grain size of the films increases with increasing In content as shown in Fig. (6) these results are in good agreement with those obtained by many authors [32,33]. Assuming that In atoms in these films bond tetrahedrally, it is shown that E F moves towards the valence band with change in composition and, hence, these films remain p-type [29].…”

Section: Electrical Conductivitysupporting

confidence: 90%

Composition Dependence of the Grain size, Activation Energy and Coordination Number in Ge40-xInxSe60 (10 ≤ x ≤ 40 at.%) Thin Films

2007

Egyptian Journal of Solids

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Bulk glasses with chemical composition of Ge 40-x In x Se 60 (10 ≤ x ≤ 40 at.%) are prepared from high purity constituent elements. Vacuum thermal evaporation technique is used to deposit thin films of these materials on glass substrates. After annealing at 485K for 4hs. the crystalline nature of the prepared thin films are investigated by X-ray diffraction (XRD). The analysis of the X-ray measurements indicates the existence of two crystalline phases namely GeInSe and In-Se phases. Electrical conductivity is measured in vacuum, in temperature range 300-430K of the as-deposit and annealed films for the studied compositions. The electrical conductivity exhibits two types of conduction mechanisms, the first mechanism due to hopping is applicable from 300-333K while the free carrier describes the conductivity in the temperature range from 333-430K. The annealed films show more conductivity and less activation energy than the as-deposited films this is due to the crystalline nature of the annealed films. Increasing In content increases the grain size and the coordination number while the activation energy is decreased.

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Section: Electrical Conductivitysupporting

confidence: 90%

Composition Dependence of the Grain size, Activation Energy and Coordination Number in Ge40-xInxSe60 (10 ≤ x ≤ 40 at.%) Thin Films

2007

Egyptian Journal of Solids

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“…a material-dependent parameter. Even if the non-Arrhenius behavior of the temperature dependence of relaxation time has been usually ascribed to the cooperativity of the process, establishing a quantitative relationship between the size of the CRR and the fragility is not obvious since many other physical and chemical parameters must be considered, such as density, macromolecular organization [27,28], microstructural organization [29,30], backbone rigidity [31], inter-and intramolecular interactions [32], and mean coordination number in the case of chalcogenide glasses [33]. From the experimental point of view, care should be paid to study the variation of fragility and CRR size by changing few and selected parameters.…”

Section: Introductionmentioning

confidence: 99%

Cooperativity length scale in nanocomposites: Interfacial and confinement effects

Saiter

Prevosto²,

Passaglia³

et al. 2013

Phys. Rev. E

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Interfacial and confinement effects on the evolution of cooperativity on approaching the glass transition have been studied in poly(propylenecoethylene) functionalized with diethylmaleate, polyethylene 1,4-cyclohexylenedimethylene terephthalate glycol and their nanocomposites with montmorillonite. A small increase of the structural dynamic cooperativity, a weak alteration of the temperature dependence of the characteristic relaxation frequency, and no changes in the glass transition temperature observed in poly(propylenecoethylene)-based samples can be rationalized in terms of interfacial interactions between polymer and exfoliated clay. On the other hand, confinement of polymer chains in the galleries of clay (intercalated nanocomposite) produces a strong reduction of cooperativity, of the temperature dependence of the characteristic relaxation frequency, and of the glass transition temperature in polyethylene 1,4-cyclohexylenedimethylene terephthalate glycol samples. Finally, by investigating the temperature dependence of a generalized fragility and of cooperativity, we evidenced that fragility of glass formers is determined not only by cooperativity.

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“…The first and broadly implemented up to now dependence 20 21 22 23 24 25 26 was proposed by Boehmer et al 15 in 1993: In 2004, Novikov and Sokolov 27 proposed yet another relation, supported by experimental evidence for a set of glass forming liquids 27 28 : …”

mentioning

confidence: 98%

Fragility and basic process energies in vitrifying systems

García

Rzoska

Drozd-Rzoska

et al. 2015

Sci Rep

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The concept of ‘fragility’ constitutes a central point of the glass transition science serving as the ‘universal’ metric linking previtreous dynamics of qualitatively distinct systems. Finding the fundamental meaning of fragility is the ‘condicio sine qua’ for reaching the long expected conceptual breakthrough in this domain. This report shows that fragility is determined by the ratio between two fundamental process energies, viz. the activation enthalpy and activation energy. The reasoning, avoiding any underlying physical model, is supported by the experimental evidence ranging from low molecular weight liquids and polymers to plastic crystals and liquid crystals. All these lead to the new general scaling plot for dynamics of arbitrary glass former. The limited adequacy of broadly used so far semi-empirical relationships between fragility and the activation energy is shown. Results presented remain valid for an arbitrary complex system and collective phenomena if their dynamics is described by the general super-Arrhenius relation.

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Mean-coordination number dependence of the fragility in Ge–Se–In glass-forming liquids

Cited by 24 publications

References 33 publications

Composition Dependence of the Grain size, Activation Energy and Coordination Number in Ge40-xInxSe60 (10 ≤ x ≤ 40 at.%) Thin Films

Composition Dependence of the Grain size, Activation Energy and Coordination Number in Ge40-xInxSe60 (10 ≤ x ≤ 40 at.%) Thin Films

Cooperativity length scale in nanocomposites: Interfacial and confinement effects

Fragility and basic process energies in vitrifying systems

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