Question

why vacancy defect known as thermodynamic defect​

Answer 1

Answer:

As the number of defects increases with temperature.

Explanation:

Vacancy defect is also known as thermodynamic defect because according to the third law of thermodynamics perfect crystals exists at 0K. As the temperature increases the chance that a lattice may be unoccupied by an ion increases. As the number of defects increases with temperature, the defects are called thermodynamics defect.

Answer 2

Solution:

The type of defect in a crystal where an atom is missing from one of the lattice sites. It is a type of Point defect.

The concentration of vacancies formed (n) is proportional to the Boltzmann factor. It is expressed as:

n ∝ $exp^{-\frac{E_{a} }{RT} }$

where, $E_a$ = Activation energy required for removal of atom from iots lattice point.

Activation energy depends on temperature.

So, concentration of vacancies formed (n) depend on temperature.

The defect which increases with temperature is called Thermodynamic defect.

Hence, vacancy defect is known as thermodynamic defect.