Assignment #1

#8 identify two crystalline directions, or vectors, in a cubic crystal which are perpendicular to

the [100] vector (5 points)

Note: the cosine of the angle between three arbitrary vectors [h1, k1,11], [h2,k2,12] and [h3,k3,13] in 3D

is:

cos(0) =

Fall 2023

h₁h₂+k₁k₂ + ₁42

(h₁² + k₁² + 1₁₂²) (h₂² + k₂² +1₂²)