2017
DOI: 10.1016/j.physb.2017.08.025
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On relaxation nature of glass transition in amorphous materials

Abstract: A short review on relaxation theories of glass transition is presented. The main attention is paid to modern aspects of the glass transition equation qτg = C, suggested by Bartenev in 1951 (q – cooling rate of the melt, τg – structural relaxation time at the glass transition temperature Tg). This equation represents a criterion of structural relaxation at transition from liquid to glass at T = Tg (analogous to the condition of mechanical relaxation ωτ = 1, where the maximum of mechanical loss is observed). The… Show more

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Cited by 44 publications
(57 citation statements)
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“…The value of T max is very close to the fictive temperature and exhibits a similar dependence on the cooling rate-as also determined recently. 72 We furthermore note that, in the case of the sodium silicate glass, an extrapolation of T max (γ) toward lower cooling rates values (typically 1 K/s) leads to a value that is comparable to the glass transition temperature observed experimentally (see Ref. 17 ).…”
Section: E Glass Relaxation At the Vicinity Of The Glass Transitionsupporting
confidence: 70%
“…The value of T max is very close to the fictive temperature and exhibits a similar dependence on the cooling rate-as also determined recently. 72 We furthermore note that, in the case of the sodium silicate glass, an extrapolation of T max (γ) toward lower cooling rates values (typically 1 K/s) leads to a value that is comparable to the glass transition temperature observed experimentally (see Ref. 17 ).…”
Section: E Glass Relaxation At the Vicinity Of The Glass Transitionsupporting
confidence: 70%
“…The mechanism of phase separation with negative heat of mixing is different from spinodal decomposition theory (the conventional phase separation caused by miscibility gap). Chen and Turnbull [54,55] proposed that the formation of a unique short-range order (SRO) in metallic glasses, which result in kinks or humps in the liquid/glass free energy curve (as shown in Figure S5), causing the thermodynamical phase separation [56]. Figure 6a shows the SAED pattern of the Cu-Zr-Al thin film metallic glass deposited at the target power of 96 W. Unlike thin film deposited at the power of 72 W, only one broad and diffuse amorphous halo is observed, while short-range ordered clusters are present in the HRTEM image (Figure 6b).…”
Section: Methodsmentioning
confidence: 99%
“…There is no more free volume at T0m in this amorphous solid. It is impossible to delocalize any atom at this temperature [33].…”
Section: Nucleation Temperatures T1 and T2 Of "Ordered" Liquids 1 Andmentioning
confidence: 99%
“…Excited delocalized atoms would be responsible for viscous flow and time dependence of Tg. At the glass transition, the process of atom delocalization would be reduced without being fully eliminated [33]. Theoretical works based on the notion that a random first-order transition lies at the heart of glass formation have been developed.…”
Section: Introductionmentioning
confidence: 99%