Role of vacancies of a strongly strained crystal in the melting process |
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Authors: | L A Bulavin O Yu Aktan and Yu F Zabashta |
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Institution: | 1.Taras Shevchenko National University of Kyiv,Kyiv,Ukraine |
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Abstract: | It has been shown that, apart from classical vacancies formed as a result of the thermal fluctuations, a crystal can contain
so-called nonclassical vacancies of nonfluctuation nature. The latter vacancies appear when the temperature exceeds a critical
value T
C
. The factor responsible for their formation is a mechanical instability of an ideal crystal. The temperature T
C
is a second-order phase transition point. The vacancies formed as a result of this phase transition are joined together into
small clusters with sizes of the order of several atoms. The above transition makes a substantial contribution to the premelting
process observed experimentally. |
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Keywords: | |
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