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Why the defects of the crystalline solid...

Why the defects of the crystalline solids are called thermodynamic defects?

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There is perfect arrangement of the constituent particles only at 0 K. As the temperature increases (say, upto room temperature ), the chance that a lattice site may be unoccupied by an ion increases. As the number of defects increases with temperature , the defects are called thermodynamic defects.
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