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A single crystal gives only a few peaks at a particular value
of 2θ, as it has one orientation.
When a well oriented, polycrystalline material is used, the
spots lengthen into arcs.
When a polycrystalline material that is poorly oriented is
used, more arcs appear at other values of 2θ. The angular spread
of the arcs is used to determine the amount of orientation.
A powder has crystals in all possible orientations
As there are all orientations of the crystal, rings of different
2θ values are formed.
