Abstract
Low-temperature crystallization of amorphous materials has been analyzed theoretically taking into account nonstationary nucleation. The kinetics of crystallization of amorphous water layers, formed by depositing molecular beams on a substrate cooled by liquid nitrogen, has been investigated by differential thermal analysis. The conditions of gas hydrate formation in low-temperature amorphous-ice layers saturated with carbon dioxide have been studied. The glass-transition and crystallization temperatures of the gas hydrates have been determined from the change in dielectric properties upon heating. Under the deep-metastability conditions, crystallization of water-gas layers leads to the formation of crystallohydrates. Gas molecules are captured by the avalanche-like nucleation of crystallization centers and, therefore, are not displaced by the moving crystal-melt interface. Gas-hydrate samples formed in nonequilibrium water-gas layers are convenient for studying their thermophysical properties.
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Original Russian Text © M.Z. Faizullin, A.V. Vinogradov, V.P. Koverda, 2014, published in Teplofizika Vysokikh Temperatur, 2014, Vol. 52, No. 6, pp. 852–862.
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Faizullin, M.Z., Vinogradov, A.V. & Koverda, V.P. Properties of gas hydrates formed by nonequilibrium condensation of molecular beams. High Temp 52, 830–839 (2014). https://doi.org/10.1134/S0018151X14050046
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DOI: https://doi.org/10.1134/S0018151X14050046