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- W2046567918 abstract "The crystal growth kinetics of GeS2 in Ge0.38S0.62 glass has been studied by Differential Scanning Calorimetry (DSC) and microsopy. The linear crystal growth kinetics of both high temperature α-GeS2 and low temperature β-GeS2 polymorphs has been observed over a relatively broad range of temperatures, i.e. 420 < T < 494 °C that correspond to viscosity of supercooled melt: 3 × 109 > η > 8 × 105 Pa s. It seems that 2D nucleated growth is the most probable mechanism of crystallization for high temperature α-GeS2 under these conditions. However, there are significant deviations for this model for the crystallization of low-temperature β-GeS2. This might indicate some changes in crystal-melt interfacial energy or break down of Stokes–Einstein relation in that particular case. At temperatures below 500 °C the temperature range of directly observed crystal growth overlaps with isothermal DSC measurements. In this case overall crystallization kinetics can be described by the Johnson–Mehl–Avrami (JMA) nucleation-growth model for kinetic exponent n ≅ 4. The value of activation energy of nucleation estimated from these experiments EN = 434 kJ mol−1 is comparable with the activation energy of viscous flow in supercooled Ge0.38S0.62 melt (Eη = 478 kJ mol−1). A more complex eutectic crystallization involving both GeS2 and GeS phases has been observed at higher temperatures. This process is probably associated with secondary nucleation and cannot be described by a simple JMA model." @default.
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- W2046567918 date "2005-03-01" @default.
- W2046567918 modified "2023-09-30" @default.
- W2046567918 title "Kinetics of crystal growth of germanium disulfide in Ge0.38S0.62 chalcogenide glass" @default.
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- W2046567918 doi "https://doi.org/10.1016/j.jnoncrysol.2005.01.042" @default.
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