UPSC Combined Geo-Scientist, Mains · 2024 · Mains Paper I
Q2(a)(ii). Schottky and Frenkel defects
Question
Differentiate between Schottky defect and Frenkel defect.
Answer in brief
Schottky defects are charge-balanced vacancies; a Frenkel defect is a vacancy–interstitial pair formed by displacement of an ion.
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CoversSchottky defectFrenkel defectpoint defectsvacancyinterstitial
All parts of Question 2
- 2(a)(i) Fluorite and antifluorite5 marks
- 2(a)(ii) Schottky and Frenkel defects5 marks
- 2(a)(iii) Normal and inverse spinels5 marks
- 2(b)(i) Regular and flattened tetrahedra5 marks
- 2(b)(ii) Two bands in high-spin [CoF₆]³⁻5 marks
- 2(c) Polymorphism in crystals5 marks