Dislocation-mediated melting of a two-dimensional crystal

Article Abstract:

Dislocation unbinding or defects play an important role in melting of two-dimensional crystals. When monolayer crystals of fatty acids coexist with their liquid phase, the interior melts prior to the grain boundaries. Melting also occurs when mechanical stress is initiated along a neutral line where the internal stress disappears. The defects migrate to the region where stress is absent, and nucleate melting. Defects need to be removed from the crystal edges when external stress is lacking.

Research, Observations, Crystals, Thermal properties, Dislocations in crystals, Dislocations (Crystals), Melting points, Melting

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Measurements of electric anisotropy due to solidification texturing and the implications for the Earth's inner core

Article Abstract:

It is thought that the Earth's solid inner core is elastically anisotropic, and the anisotropy is thought to increase with turning depth. It is proposed that the elastic anisotropy and depth dependence could be due to solidification texturing resulting from dendritic growth of iron crystals. Directionally solidified metallic alloys exhibited elastic anisotropy in laboratory measurements.

Measurement, Natural history, Earth, Anisotropy

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