Question

1) explain metal excess defect due to anion vacancies?
2) explain metal deficiency defect due to cation vacancy?​

Answer 1

Explanation:

1 Metal excess defect:

This defect is caused due to anionic vacancies and by the presence of extra cations in the interstitial sites. ... The electron is lost by the metal atom is then diffuses the crystal and occupy the anionic vacancy site and form F-centres inside the crystal.

2. In this a cation is missing from its lattice site. To maintain electrical neutrality, one of the nearest metal ion acquires two positive charge. This type of defect occurs in compounds where metal can exhibit variable valency.

Answer 2

Answer:

1)Metal excess defect:

Metal excess defect:This defect is caused due to anionic vacancies and by the presence of extra cations in the interstitial sites. ... The electron is lost by the metal atom is then diffuses the crystal and occupy the anionic vacancy site and form F-centres inside the crystal.

2)In this a cation is missing from its lattice site. To maintain electrical neutrality, one of the nearest metal ion acquires two positive charge. This type of defect occurs in compounds where metal can exhibit variable valency.