Question

1. For each of the (100). (110), and (111) planes, state all of the < 100 >, < 110 >, and < 111 > directions that lie on each of the planes. Hint: the directions that lie on the plane are perpendicular to the plane normal. The normal direction of a cubic plane has the same indices as the plane.

Answer 1

Weiss Zone Law: Condition for a direction [u v w] to lie in a plane (hku) is Thu+ Kor 1W=0 For (100) Here, h=1; K= = 0 + 1 (u) +0(0)+ 0(W)=0 + U=0 and 1, w can be any thing [o w w] are lies in (100) For (110) » [0 11), [o 11], [011][011] Here h=1; K=1 ; d=0 → Hu) + 2(0) +0(W) =0 [1 1 0], [1 10] 2. → -U= 29 and W can be anything [1 1 1], [[ 11] ſ lies in (110)

For (111) Here hel; K=1;0=1 1()+ 1 (0) + 1 (W) =0 Any set satisfying can be an answer. [urw] = [011] , [o 7 1] [ooo] [101], [101] [170], [I 10]
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