Why stoichiometric defects are also called intrinsic defect?

Stoichiometric defects are referred to as intrinsic defects because they arise from the inherent properties of the crystal structure rather than from external influences or impurities. These defects occur due to the absence or misplacement of atoms that disrupt the ideal stoichiometric ratiOS, such as vacancies or interstitials in a perfect lattice. Since they are a fundamental aspect of the material’s structure, they are considered intrinsic to the material itself.