Western Illinois University: Macomb Campus
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Department of Physics
Student Seminar Announcement for April 17
Apr 12, 2013
PHYS600 Wednesday, April 17, 4:00-4:50 pm
Currens Hall 205
All physics faculty and students are invited.
Speaker: Kinnary Patel
Graduate Student, Physics Department, WIU
The discovery of Quasicrystals (QCs) brought about a paradigm change in chemistry, physics, material science and other areas of science and engineering. QCs are materials with perfect long-range order, but with no three-dimensional translational periodicity. QCs consist mainly of alloys of aluminum and transition metals such as iron or copper. They are distinguished by their novel symmetries, such as the rotational symmetry of an icosahedron that are forbidden in crystalline structures. Although lacking three-dimensional translational periodicity, QCs display translational Quasiperiodicity, leading to the dense collection of Bragg peaks in the diffraction pattern. Diffraction studies of QCs present a challenge because of their Quasiperiodicity. In order to build some intuition about diffraction from QCs, the laser diffraction for periodic and aperiodic gratings were studied. In this presentation I will compare crystals and QCs and discuss QCs in detail.