Discussion
A Schottky defect in an ionic crystal is a stochiometric defect of
Answer: C
A Schottky defect is a cation and anion vacancy.
In an ionic crystal such as NaCl, a Schottky defect is a pair (more generally a stoichiometric group) of vacancies: one cation and one anion missing from their lattice sites, the ions having moved to the surface. Removing them in that ratio keeps the crystal electrically neutral and the composition stoichiometric. It lowers the density.
A cation vacancy or an anion vacancy alone would leave a net charge. Interstitial ions belong to the Frenkel defect, in which an ion (usually the smaller cation) leaves its site for an interstitial position, creating a vacancy-interstitial pair.
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development