Cv=exp(-
∆
Gv/kT)
D=Do exp(-Q/kT)= Do exp(-Q/RT), R=2 cals/mole
l= 2d sin q
N=2
(n-1)
Q1. Using the same coordinate system and the same position of the origin determine the Mil
plane ABC and the direction PQ in the unit cell below. AQ is (3/4) along the face diagonal. A
following questions.
1. The origin should be chosen
a. at P b. at A c. corner above A
2. The intercepts that the plane makes with the axes chosen parallel to the dashed lines are
a. a/2,a/2,0 b. -a/2,a/2,-a c. a/2,a/2,a
3. Miller indices of the plane, with the negative sign taken as a bar, are
a. (110) b. (-2 2 -1) c. (221)
4. For the direction PQ with the same origin and same coordinate system chosen above, the i
the coordinates
a. -1,1,0 b. 1,1,-1 c. -1,-1,0
5. The coordinate of the final point are
a. 3/4,3/4, 0 b. -3/4,3/4,0 c. -3/4,3/4,-1
6. Miller indices of the direction PQ, with the negative sign taken as a bar, are
a. [1-1-4] b. [114] c. [174]
7. The indices of the normal to the plane ABC, with the negative sign taken as a bar, are
a. [221] b. [-22-1] c. [111]
8. Is the direction contained in the plane
a. yes b.no
Q2. Iron takes up body centered unit cell at room temperature. The size of the unit cell is 0.2
diffraction is carried out with copper radiation of wave length 0.154 nm. Answer the followi
1. The hkl reflection that appears first in the diffraction pattern from iron is