Relationship between melting and amorphization of ice

Article Abstract:

The pressure-induced amorphization of crystalline ice is a transition from a two-phase melting process towards a one-phase amorphization process that involves mechanical instability limit of a solid. Pressure-induced transition from an melting to amorphization occurs at around 140-165 degrees kelvin. The crystalline ice transforms into a supercompressed form in this temperature range and appears like a highly viscous liquid. Crystalline ice is in an unrelaxed phase similar to high-density amorphous form below 140 degrees kelvin.

Analysis, Ice

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Irregular variations in the melting point of size-selected atomic clusters

Article Abstract:

It is well known that bulk matter melts and freezes and that pure material has a precise melting point at a given pressure. However, a new study of ionized sodium clusters comprising 70-200 atoms reveals that their melting temperatures are on average 33% lower than bulk material, with the melting point dependent upon changes in the cluster size. There is no theoretical explanation for such variations, but it is suggested that there may be interplay between electronic and geometric structure.

Chemistry, Physical and theoretical, Physical chemistry, Clusters (Chemistry)

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Electric-field-enhanced crystallization of amorphous silicon

Article Abstract:

Polycrystalline silicon thin films are important in many electronic applications. They are typically produced by annealing films of amorphous silicon and research concentrates on lowering the crystallization temperature. It can be reduced by adding certain metals such as nickel. It is shown that the rate of metal-induced crystallization can be enhanced in the presence of an electric field.

Thin films, Electric fields

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