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SOLUTIONS MANUAL
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,TABLEOFCONTENTS
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Chapter 1 - 1-1
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Chapter 2 - 2-1
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Chapter 3 - 3-1
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Chapter 4 - 4-1
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Chapter 5 - 5-1
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Chapter 6 - 6-1
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Chapter 7 - 7-1
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Chapter 8 - 8-1
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Chapter 9 - 9-1
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Chapter 10 - 10-1
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Chapter 11 - 11-1
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Chapter 12 - 12-1
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Chapter 13 - 13-1
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Chapter 14 - 14-1
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Chapter 15 - 15-1
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Chapter 16 - 16-1
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Chapter 17 - 17-1
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Chapter 18 - 18-1
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Chapter 20 - 20-1
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Chapter 21 - 21-1
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Chapter 22 - 22-1
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,CHAPTER 1 d
1. The vectors x̂ +yˆ+zˆ and −xˆ−yˆ+zˆ are in the directions of two body diagonals of a
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cube. If is the angle between them, their scalar product gives cos = –1/3, whence
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= cos−11/3 = 90+1928' =10928'.
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2. The plane (100) is normal to the x axis. It intercepts the a' axis at 2a' and the c' axis
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at 2c'; therefore the indices referred to the primitive axes are (101). Similarly, the plane
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(001) will have indices (011) when referred to primitive axes.
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3. The central dot of the four is at distance
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cos60 a
a = a ctn 60= cos
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30 d 3
from each of the other three dots, as projected onto the basal plane. If the
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(unprojected) dots are at the center of spheres in contact, then
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2 2
a c d d d d
a 2 = + ,
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d
d
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2
3 d d
d
or
1 2 c 8
a2 = c2;
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=1.633. d
3 4 a 3
1-1
, CHAPTER 2 d
1. The crystal plane with Miller indices
d d d d d d hkℓ is a plane defined by the points a1/h, a2/k, and a3 /ℓ. (a)
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Two vectors that lie in the plane may be taken as a1/h – a2/k and
d d d d d d d d d d d d d d d a1 /h −a3 /ℓ. But each of these vectors gives
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d zero as its scalar product with
d d d d d d G = ha1 +ka2 +ℓa3, so that G must be perpendicular to the plane
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hkℓ. (b) If n̂ is the unit normal to the plane, the interplanar spacing is n̂a1/h. But n̂ =G/ | G |,
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whence d(hkℓ) =Ga1 /h|G|= 2/ |G|. (c) For a simple cubic lattice G = (2/a )(hx̂ +kyˆ +ℓẑ ) , whence
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d
d d d d d d d d d d d d d d d d d d d d d d d d
G2 h +k +ℓ
2 2 2
1
= =
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d
d2 42 . d
a2
1 1
3a a 0
d
2 2
1 1
2. (a) Cell volume a a a = − 3a a 0
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1 2 3
2 2
0 0 c
1
= d 3a2c. d
2
x̂ yˆ zˆ
a2 a3 1 1
(b) b = 2 = 4 − 3a a 0
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d
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1
|a a a |
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2
3a c 2 2
1 2 3 d
0 0 c
2 1
= ( x̂ +ŷ ), and similarly for b 2, b3.
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a
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d
3
(c) Six vectors in the reciprocal lattice are shown as solid lines. The broken lines
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are the perpendicular bisectors at the midpoints. The inscribed hexagon forms the
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first Brillouin Zone.
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3. By definition of the primitive reciprocal lattice vectors
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(a2 a 3 )(a3 a 1 )(a1 a 2 )
V = (2)3 = (2)3 / |(a a a )|
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BZ
|(a a a ) |
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3
d
1 2 3
1 2 3
= (2)3 /V .C
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For the vector identity, see G. A. Korn and T. M. Korn, Mathematical handbook for scientists
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dand engineers, McGraw-Hill, 1961, p. 147.
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4. (a) This follows by forming
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2-1