Premelting

（重定向自Surface melting）

Boundary between phase (1) and phase (2) without and with intermediate phase (3)

A qualitative picture of the order parameter of a premelting solid for temperatures below the melting point. One can see that there is still a high amount of order in the liquid, which decreases with rising Temperature

$Shadowing and blocking diffraction experiment to show the occurrence of premelting. The incident beam follows a crystal direction, so does the angle under which the detector is. The disorder of the quasi liquid premelt changes the scattering spectrum.$

Premelting (also: Surface melting) describes the fact that, even below its melting point ( $T_m$ ), quasi-liquid films can be observed on crystalline surfaces. The thickness of the film is temperature ( $T$ ) dependent. This effect is common for all crystalline materials. Premelting shows its effects in e.g. frost heave, the growth of snowflakes and, taking grain boundary interfaces into account, maybe even in the movement of glaciers. Considering a solid-vapour interface, complete and incomplete premelting can be distinguished. During a temperature rise from below to above $T_m$ , in the case of complete premelting, the solid melts homogeneously from the outside to the inside; in the case of incomplete premelting, the liquid film stays very thin during the beginning of the melting process, but droplets start to form on the interface. In either case, the solid always melts from the outside inwards, never from the inside.

单词	Surface melting
释义	Surface melting 英语百科 Premelting （重定向自Surface melting） $Shadowing and blocking diffraction experiment to show the occurrence of premelting. The incident beam follows a crystal direction, so does the angle under which the detector is. The disorder of the quasi liquid premelt changes the scattering spectrum.$ Premelting (also: Surface melting) describes the fact that, even below its melting point ( $T_m$ ), quasi-liquid films can be observed on crystalline surfaces. The thickness of the film is temperature ( $T$ ) dependent. This effect is common for all crystalline materials. Premelting shows its effects in e.g. frost heave, the growth of snowflakes and, taking grain boundary interfaces into account, maybe even in the movement of glaciers. Considering a solid-vapour interface, complete and incomplete premelting can be distinguished. During a temperature rise from below to above $T_m$ , in the case of complete premelting, the solid melts homogeneously from the outside to the inside; in the case of incomplete premelting, the liquid film stays very thin during the beginning of the melting process, but droplets start to form on the interface. In either case, the solid always melts from the outside inwards, never from the inside.
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