2. Indices of planes. Consider the planes with indices (100) and (001); the lattice is fcc, and the indices refer to the conventional cubic cell. What are the indices of these planes when referred to the primitive axes of Fig. 11?

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2. Indices of planes. Consider the planes with indices (100) and (001); the lattice is
fce, and the indices refer to the conventional cubic cell. What are the indices of
these planes when referred to the primitive axes of Fig. 11?
Transcribed Image Text:2. Indices of planes. Consider the planes with indices (100) and (001); the lattice is fce, and the indices refer to the conventional cubic cell. What are the indices of these planes when referred to the primitive axes of Fig. 11?
a
5
Figure 11 The rhomboledral primitive cell of the face-centered
cubic crystal. The primitive translation vectors a, a, a connect
the lattice point at the origin with lattice points at the face centers.
As drawn, the primitive vectors are:
a₁ = a(+9) a= a(y + 2); ₁= !a(2+ X).
The angles between the axes are 60°.
23
₂
120
Figure 12 Relation of the primitive cell
in the hexagonal system (heavy lines) to
a prism of hexagonal symmetry. Here
Transcribed Image Text:a 5 Figure 11 The rhomboledral primitive cell of the face-centered cubic crystal. The primitive translation vectors a, a, a connect the lattice point at the origin with lattice points at the face centers. As drawn, the primitive vectors are: a₁ = a(+9) a= a(y + 2); ₁= !a(2+ X). The angles between the axes are 60°. 23 ₂ 120 Figure 12 Relation of the primitive cell in the hexagonal system (heavy lines) to a prism of hexagonal symmetry. Here
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