Abstract
Acoustic technique was used to study the melting and freezing phase transitions of mercury embedded into Vycor glass. Both freezing and melting were found to be smeared and shifted noticeably to low temperatures compared to the melting point of bulk mercury, the offset of melting occurred at 223 K. The liquid skin model which was developed to treat melting in isolated metallic particles was used to explain the partly reversible character of melting for confined mercury and the difference between results obtained for longitudinal and transverse waves. The temperature dependence of the liquid skin thickness was calculated. Freezing was suggested to be driven by nucleation processes. It was shown that for confined mercury there is no unambiguous correspondence between pore sizes and temperatures of melting.
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