Grain Boundary Scars on Spherical Crystals
Thomas Einert, Peter Lipowsky, Jorg Schilling, Mark J. Bowick and, Andreas Bausch
TL;DR
This study develops an experimental system to observe lattice defects on spherical crystals, confirming theoretical predictions about scar distribution and their geometric arrangement on the sphere.
Contribution
We introduce a novel experimental setup with fluorescent particles to visualize and analyze grain boundary scars on spherical crystals, validating theoretical models.
Findings
Number of scars matches predictions
Excess dislocations per scar agree with theory
Scar centers roughly form an icosahedral pattern
Abstract
We present an experimental system suitable for producing spherical crystals and for observing the distribution of lattice defects (disclinations and dislocations) on a significant fraction (50%) of the sphere. The introduction of fluorescently labeled particles enables us to determine the location and orientation of grain boundary scars. We find that the total number of scars and the number of excess dislocations per scar agree with theoretical predictions and that the geometrical centers of the scars are roughly positioned at the vertices of an icosahedron.
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