Issue |
Europhys. Lett.
Volume 56, Number 6, December 2001
|
|
---|---|---|
Page(s) | 829 - 835 | |
Section | Condensed matter: structure, mechanical and thermal properties | |
DOI | https://doi.org/10.1209/epl/i2001-00594-y | |
Published online | 01 December 2003 |
Morphology of structures in diffusional growth in three dimensions
Laboratorium für Festkörperphysik,
Eidgenössische Technische Hochschule
CH-8093 Zürich, Switzerland
Received:
7
May
2001
Accepted:
4
October
2001
In our experiments, we investigate in situ
three-dimensional crystals during free growth into pure
undercooled liquid xenon. The undercooling is in the
range of
. We initiated morphological transitions of the
growing crystal from dendrite to seaweed by a cooling step. The
fact that such a transition is possible indicates that a similar
morphology diagram, as it is proposed by other authors for
two-dimensional growth, is also valid in three dimensions, at least
for transient patterns. During
the transition from dendrite to seaweed the growth velocity of the
crystal decreases and the tip radius increases. For a doublon it
is found that the two fingers can be characterized by the tip
radius of an unperturbed dendrite at the same nominal
undercooling in our experiments, where transient patterns are observed.
PACS: 68.70.+w – Whiskers and dendrites / 81.10.Aj – Theory and models of crystal growth; physics of crystal growth, crystal morphology and orientation / 64.70.Dv – Solid-liquid transitions
© EDP Sciences, 2001
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