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Size and rate dependence of crystal nucleation in single tin drops by fast scanning calorimetry

Journal of Chemical Physics, ISSN: 0021-9606, Vol: 138, Issue: 5
2013
  • 48
    Citations
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  • 24
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Metrics Details

  • Citations
    48
    • Citation Indexes
      48
  • Captures
    24

Article Description

The experimentally accessible degree of undercooling of single micron-sized liquid pure tin drops has been studied via differential fast scanning calorimetry. The cooling rates employed ranged from 100 to 14 000 K/s. The diameter of the investigated tin drops varied in the range from 7 to 40 μm. The influence of the drop shape on the solidification process could be eliminated due to the nearly spherical shape of the single drop upon heating and cooling and the resultant geometric stability. As a result it became possible to study the effect of both drop size and cooling rate in rapid solidification experimentally. A theoretical description of the experimental results is given by assuming the existence of two different heterogeneous nucleation mechanisms leading to crystal nucleation of the single tin drop. In agreement with the experiment these mechanisms yield a shelf-like dependence of crystal nucleation on undercooling. A dependence of crystal nucleation on the size of the tin drop was observed and is discussed in terms of the mentioned theoretical model, which can possibly also describe the nucleation for other related rapid solidification processes. © 2013 American Institute of Physics.

Bibliographic Details

Bin Yang; A. S. Abyzov; E. Zhuravlev; Yulai Gao; J. W. P. Schmelzer; C. Schick

AIP Publishing

Physics and Astronomy; Chemistry

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