Question

Inspite of long range order in the arrangement of particles, why are crystals usually not perfect?

Answer 1

Due to presence of various types of defects in Crystal lattice

Answer 2

Hey!!

Here is your answer -

Crystals have long range in the arrangement of particles but usually the crystals are not perfect this is because when crystallization occurs at a fast rate or moderate rate, the constituent particles may not get sufficient time to arrange themselves in a perfect order.