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When Sr2+ ions are introduced, Na+ ions are displaced to preserve charge balance. What is the name of this defect?

1. a) Each Sr2+ ion added results in the removal of one Na+ ion to maintain charge neutrality.
2. b) The concentration of cation vacancies equals the mole percentage of SrCl2 added, calculated as 10^-4 mole % = (10^-4 / 100) × 6.023 × 10^23 = 6.023 × 10^17.
3. c) This type of defect is referred to as a Schottky defect.
4. d) None of these.

Correct answer: c) This type of defect is referred to as a Schottky defect.

Solution

The defect described involves the creation of cation vacancies to maintain electrical neutrality, which is characteristic of a Schottky defect.

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