Question: materials and environment Crystal structures (10p) a) Draw the SC, BCC and FCC crystal structures. Rank (in descending order) them by Atomic Packing Factor (APF).

materials and environment

Crystal structures (10p) a) Draw the SC, BCC and FCC crystal structures. Rank (in descending order) them by Atomic Packing Factor (APF). b) Explain how X-ray crystallography works and what information you get about the crystal structure when you use it to examine e.g. a metal. c) Calculate the theoretical density of chromium (Cr) using the following data: Theoretical density Pteort =VCNAnA the number of atoms in the unit cell, for nice =4; necc-2; n=6; A=atomic weight, can be found in tables or in the book. Also available in the lectures.. VC,BCC=a3,VC,FCC=a3,VC.HCP=6R2c3 NA-Avogadro's number Cr has R=0.1249nm and a==4R/3

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