513.001 Molecular and Solid State Physics

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Physical
Constants

Periodic System
of Elements

      

Reciprocal lattice of fcc

The first Brillouin zone of an fcc crystal is a truncated octahedron. How far is it from the center of the Brillouin zone to the center of the square faces ΓX and how far is it from the center of the Brillouin zone to the center of the hexagonal faces ΓL. Explain your reasoning.