1.
Each of following figures is a unit cell with a righthanded coordinate system:
All intercepts are simple fractions of a lattice parameter.
Write the indices for each point, direction or plane in the corresponding answer box. Label the
origin with O if it is not indicated.
Use correct notation
.
California State Polytechnic University, Pomona
College of Engineering
MTE 208
Fall 2008 Quiz 2
October 16, 2008
Name: ________________________________________
x
y
z
y
b.
[
]
2
2
1
c.
(
)
2
3
1
d.
(
)
0
1
1
a.
O
2
1
1
2
1
You may, optionally, use commas for points,
but not for directions or planes.
a.
O
2
1
1
1
b.
[
]
2
1
2
c.
(
)
2
3
4
d.
(
)
(
)
0
2
2
or
0
1
1
a.
O
1
2
1
2
1
b.
[
]
2
1
2
c.
(
)
4
3
2
d.
(
)
0
1
2
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2.
Draw the following in the unit cells provided. (First decide: is it a point, direction or plane?)
(2 0 1)
b.
/ 5
/ 5
/ 5
a.
[ 1 2 3]
Divide by 3, shift origin (this arrow is difficult to draw on the
computer: from tail move 1/3a, +2/3b, c
1/2 1/2 1
c.
Move origin to corner indicated by either small arrow. invert:
½
infinity 1 are the axial intercepts.
1/2 1 1/2
b.
[ 2 3 1]
Move origin to corner indicated by small arrow. Divide by 3: 2/3 1 1/3
That’s the coordinate for the head of the direction vector.
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 Fall '08
 SNYDER
 Chemistry, Chemical element, Ion

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