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- W2890899448 abstract "Two distinct trends in the temperature dependence of viscosity, measured directly and inferred from calorimetry by analyzing crystallization kinetics, can be correlated with the temperature evolution of the height of the first peak of the x-ray total structure factor for liquid GeTe and ${mathrm{Ge}}_{15}{mathrm{Te}}_{85}$. The phase-change chalcogenide GeTe is a high-fragility liquid with the kinetic fragility value of 76, at the glass-transition temperature, being between those for liquid (Ag,In)-doped ${mathrm{Sb}}_{2}mathrm{Te}$ and ${mathrm{Ge}}_{2}{mathrm{Sb}}_{2}{mathrm{Te}}_{5}$. The viscosity of the high-temperature liquid shows Arrhenius kinetics on cooling to the melting point, and the structure factor conforms to the fragile liquid. For liquid ${mathrm{Ge}}_{15}{mathrm{Te}}_{85}$, the temperature evolution of the structure factor suggests a transition in the temperature range of about 100 K above the melting. The crystallization shows a wide range of Arrhenius kinetics in the supercooled liquid region. This finding combined with the dynamic viscosity measurements is interpreted by invoking a weak fragile-to-strong crossover on cooling the liquid ${mathrm{Ge}}_{15}{mathrm{Te}}_{85}$. The differences in structures and dynamics of liquid GeTe and ${mathrm{Ge}}_{15}{mathrm{Te}}_{85}$ appear closely correlated to their distinctly different crystallization mechanisms." @default.
- W2890899448 created "2018-09-27" @default.
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- W2890899448 date "2018-09-21" @default.
- W2890899448 modified "2023-09-27" @default.
- W2890899448 title "Correlating ultrafast calorimetry, viscosity, and structural measurements in liquid GeTe and <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Ge</mml:mi><mml:mn>15</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>85</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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- W2890899448 doi "https://doi.org/10.1103/physrevmaterials.2.093405" @default.
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