Observation of Oriented Close-Packed Lattice Planes in Polycrystalline Hard-Sphere Solids
✍ Scribed by Andreas Heymann; Andreas Stipp; Christian Sinn; Thomas Palberg
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 475 KB
- Volume
- 207
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
We report time-resolved Bragg scattering experiments on solidifying colloidal suspensions of hard spheres. The polar angle-averaged, integrated intensity of the (111) and (311) reflections show a transient, two-step behavior below melting, which depends in a complex way on the volume fraction and is not present for (200) or (220). Detailed analysis of the full two-dimensional scattering pattern reveals intensity maxima of sixfold symmetry close to the position of the (111) and (311) Debye-Scherrer rings. These can be explained assuming oriented crystals with close-packed planes parallel to the container walls. We show that the observed temporal behavior is due to competing homogeneous and heterogeneous nucleation and growth scenarios. Copyright 1998 Academic Press.