Question

Describe stoichiometric and non-stoichiometric defects in ionic crystals.

Answer 1

Answer:

Stoichiometric Defects. The compounds in which the number of positive and negative ions are exactly in the ratios indicated by their chemical formulae are called stoichiometric compounds. The defects do not disturb the stoichiometry (the ratio of numbers of positive and negative ions) are called stoichiometric defects.

Non-stoichiometric defects: The defects which disturb the stoichiometry of the compounds are called Non-stoichiometry defects. These defects are either due to the presence of excess metal ions or deficiency of metal ions. ... This type of defects are found in crystals which are likely to possess Schottky defects.