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Question
Examine the defective crystal given below and answer the question that follows:
| A+ | B− | A+ | B− | A+ |
| B− | B− | A+ | B− | |
| A+ | B− | A+ | A+ | |
| B− | A+ | B− | A+ | B− |
State if the above defect is stoichiometric or non-stoichiometric. How does this defect affect the density of the crystal? Also, write the term used for this type of defect.
Very Short Answer
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Solution
- Nature: Stoichiometric
- Effect on density: Decreases
- Type of defect: Schottky defect
- Explanation: An equal number of A+ and B− ions are missing, maintaining electrical neutrality but reducing mass.
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States of Matters: Structure and Properties Solid State - Point Defects – F Centers
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