Crystal Growth Velocity in As<sub>2</sub>Se<sub>3</sub> Supercooled Liquid

Málek, Jiřı́; Shánělová, Jana; Martinková, Simona; Pilný, Petr; Košťál, Petr

doi:10.1021/acs.cgd.7b01001

Cited by 11 publications

(14 citation statements)

References 42 publications

(107 reference statements)

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“…Reduced temperature ( T / T m ) dependent crystal growth rate for different materials. All the crystal growth rates of SiO 2 , Na 2 O·SiO 2 , Cu 50 Zr 50 , OTP, and GST, GeTe, AIST, as well as As 2 Se 3 , are obtained from the literature. The crystal growth rates of As 2 S 3 (black rhombuses) at standard atmospheric pressure (∼100 kPa) were estimated from the data measured at an ultrahigh pressure of 15 kbr …”

Section: Disscussionmentioning

confidence: 99%

New Methods Versus Old Questions: Crystallization Kinetics of S, Se, and Te

Chen

Wang²,

Shen³

et al. 2019

Crystal Growth & Design

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Using conventional differential scanning calorimetry (DSC) and Flash DSC, we revisited the old question of crystallization kinetics of chalcogens. Together with the appropriate viscosity models and Stokes− Einstein relation, the quantitative results of crystallization kinetics in chalcogenide supercooled liquids were revealed. It showed that the fragilities of S, Se, Te are 126, 67.5, 60, and the maximum crystal growth rates are 9.7 × 10 −3 , 1.3 × 10 −6 , and 0.47 m s −1 at 0.91, 0.94, and 0.86 T m , respectively. Such results not only benefit to understand the fundamental science but also help to design new chalcogenide compositions for applications.

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Section: Disscussionmentioning

confidence: 99%

New Methods Versus Old Questions: Crystallization Kinetics of S, Se, and Te

Chen

Wang²,

Shen³

et al. 2019

Crystal Growth & Design

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“…The exponential term in eq can be neglected for moderate entropy of melting (Δ S m / R = 2.47) and supercooling Δ T > 300 K. The decoupling parameter ξ then can be expressed as where E η is the activation energy of viscous flow, estimated as E η = 462 kJ/mol . The decoupling parameter calculated from eq is ξ = 0.92 for β-GeS 2 crystal growth in the bulk, ξ = 0.53 at the glassy surface, and ξ = 0.36 in the thin film.…”

Section: Discussionmentioning

confidence: 99%

“…A similar conclusion was drawn from calorimetric and microscopic crystal growth data in selenium 46 and As 2 Se 3 supercooled liquid. 58 On the other hand, the parameters M and N indicate a relatively fast increase in the initial crystallization rate that might be due to a secondary nucleation induced by crystal growth. 61,69 This, in combination with impingement of growing crystals, can be a plausible explanation why the standard JMA model cannot be used for the description of nonisothermal calorimetric data.…”

Section: Thementioning

confidence: 99%

Crystal Growth Kinetics in GeS₂ Glass and Viscosity of Supercooled Liquid

2021

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The crystal growth kinetics and morphology in germanium disulfide bulk glass and glass surface is described. The structural relaxation taking place below the glass transition is slow and the corresponding volumetric change is negligible. Therefore, it does not affect substantially the crystal growth process. The crystal growth rate of low temperature β-GeS2 and high temperature α-GeS2 polymorphs in the bulk glass is comparable, being slightly decoupled from the shear viscosity below the glass transition. The crystal growth rate of β-GeS2 in an amorphous thin film of the same composition is several orders of magnitude faster than that at the surface of bulk glass. This fast surface crystal growth is strongly decoupled from viscosity. Such behavior resembles the glass-to-crystal fast growth mode observed by several authors in some organic molecular glasses. Taking into account previously reported viscosity and heat capacity data, the crystal growth kinetics of both polymorphs can be quantitatively described by the 2D surface growth model for low and high supercooling. The nonisothermal differential scanning calorimetry experiments are analyzed, providing evidence of a complex nature of the overall crystallization process with apparent activation energy comparable to that obtained from isothermal microscopy measurement of crystal growth in the same temperature range.

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“…Significant crystallization studies were reported for phase change materials of chalcogenides 28,29 . Some authors also focused their attention on the combined study of the kinetics of crystal growth of chalcogenide glasses by microscopy and DSC 30–33 . The crystal growth rate in thin chalcogenide films was calculated using a correlation between DSC data (described by the JMAK model) and microscopy data 29,34,35 .…”

Section: Introductionmentioning

confidence: 99%

Direct comparison of surface crystal growth kinetics in chalcogenide glass measured by microscopy and DSC

et al. 2023

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Surface crystallization in fine powder Se 70 Te 30 chalcogenide glass was studied by differential scanning calorimetry (DSC) and optical microscopy. A complex kinetic analysis of these experimental data reveals that the contracting sphere mechanism (R3 model) is the rate determining step of crystal growth, and the conventional Johnson-Mehl-Avrami-Kolmogorov model cannot be used in this case. Moreover, it is clearly shown that the particle size distribution should be considered in crystallization studies. Actually, when the particle size effect is taken into account, the simulated DSC curves for the R3 model agree very well with the experimental data over the entire temperature range. The crystallization kinetics determined from the nonisothermal DSC data are consistent with previously reported isothermal crystallization data for the same powder fraction. The crystal growth rate calculated from isothermal and nonisothermal DSC data agrees very well with the microscopically measured surface and bulk crystal growth rate.

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Crystal Growth Velocity in As₂Se₃ Supercooled Liquid

Cited by 11 publications

References 42 publications

New Methods Versus Old Questions: Crystallization Kinetics of S, Se, and Te

New Methods Versus Old Questions: Crystallization Kinetics of S, Se, and Te

Crystal Growth Kinetics in GeS₂ Glass and Viscosity of Supercooled Liquid

Direct comparison of surface crystal growth kinetics in chalcogenide glass measured by microscopy and DSC

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Crystal Growth Velocity in As2Se3 Supercooled Liquid

Cited by 11 publications

References 42 publications

New Methods Versus Old Questions: Crystallization Kinetics of S, Se, and Te

New Methods Versus Old Questions: Crystallization Kinetics of S, Se, and Te

Crystal Growth Kinetics in GeS2 Glass and Viscosity of Supercooled Liquid

Direct comparison of surface crystal growth kinetics in chalcogenide glass measured by microscopy and DSC

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Crystal Growth Velocity in As₂Se₃ Supercooled Liquid

Crystal Growth Kinetics in GeS₂ Glass and Viscosity of Supercooled Liquid