H6.

1.3 Consider the FCC primitive unit cell with primitive vectors: a = (9 + 2), az = = (2 + 8), as = =(8+1) with generated primitive reciprocal lattice vectors : 2n b1 = - (-8 +)+2), b2 = -(x -1+2), by =-(2+9-2) (a) Calculate the length of the [211] vector, where the Miller indices are referred to the FCC primitive reciprocal lattice. (3) (b) Use this results to obtain the separation of the (211) planes in the primitive lattice. (2)