Materials Science and Metallurgy Course C6: Crystallography

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Materials Science and Metallurgy Course C6: Crystallography Part II Materials Science and Metallurgy Course C6: Crystallography Professor Harry Bhadeshia Lecture 9: Quasicrystals

Quasicrystals long range order no 3-D translational symmetry sharp diffraction patterns

Icosahedral Al-Pd-Mn Al-Cu-Fe Ho-Mg-Zn Decagonal Al-Ni-Co

icosahedron has 12 corners most definitions indicate 20 faces

Al-Ni-Co

fiboncci chain

Phasons: in quasicrystals, the atomic planes contain more than one shape. Atoms can fluctuate between two nearby positions in a way that tiles exchange positions without disrupting shape.

A quasiperiodic system may be considered as the intersection of a lattice periodic structure in a higher-dimensional space and the physical space.