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In spite of long range order in the arra...

In spite of long range order in the arrangement of particles why are the crystals ususally not perfect?

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In a perfect crystal, constituent particles have ordered long range arrangement. Such a crystal is obtained only at 0K. At any temperature above 0K, there occurs some irregularities in the arrangement of constituent particles in a crystal, resulting in defects in the crystal. Therefore, all real crystals always possess some sort of defects.
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