Physics for Electronics Engineering: Unit I: Crystallography
Unit Cell
Definition, Figure | Crystallography
The unit cell is defined as the smallest geometric figure which is repeated in three dimension to derive the actual crystal structure.
UNIT
CELL
Consider a two-dimensional space lattice
as shown in fig. 1.6.
It is found that when a parallelogram
ABCD is repeated by an integral multiple of vectors
a and b corresponding to AB and AD, the whole pattern (or array) is
obtained.
The region ABCD is known as unit cell. a and b are basis vectors.
The choice of the unit cell is not
unique. It can be constructed in a number of ways like A' B' C' D' or A"
B" C" D" without affecting the symmetry of the crystal (fig.
1.6).
Definition
The unit cell is defined as the smallest
geometric figure which is repeated in three dimension to derive the actual
crystal structure.
The unit cell fully represents the
characteristics of the entire crystal.
The same principle is extended for a
three-dimensional case. A unit cell in three-dimension is shown fig. 1.7.
It is also defined as the smallest
volume of a solid from which the entire crystal structure is constructed by
translational repetition in three-dimensions.
Physics for Electronics Engineering: Unit I: Crystallography : Tag: : Definition, Figure | Crystallography - Unit Cell
Physics for Electronics Engineering: Unit I: Crystallography
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Physics for Electronics Engineering
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