Question

The atomic radius of FCC aluminum is 0.142 nm. What is the lattice parameter of the unit cell? What is the most densely packed direction and plane in this material? If this was an BCC material, on the cube shown below sketch the most densely packed crystal plane, and state that plane here. Identify the plane shown below for a cubic system and compute the planner density for a BCC material of the plane shown.

Answer 1

0 (100) 24 a 7 - X נייס] (2) ( ) N Given For At : r = 0.14 2 nm from fig, (2) ſza=4r a la Hice parameter : a 47 TE 4 x 0.142 J2 hm a=0.40 16 nm (Ans ) . + Must densely packed direction packed direction is the direction which intercept must no. of atoms per unit length For FCC any of the face diagonal has maximum linear density for eig, To ll] shown above. For FCC any face plane has maximum planar density. shown above. For example ( ددا)