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Question
Explain the following term with a suitable example:
Interstitials
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Solution
- When certain constituent particles, such as atoms or molecules, occupy interstitial positions, we refer to a crystal as having an interstitial defect.
- As shown in the figure, the presence of interstitial particles increases the substance’s density.
- Non-ionic solids exhibit interstitial flaws and vacancies.
- Ionic solids do not have simple vacancies or interstitial flaws as previously described because they must always maintain electrical neutrality.
- Rather, they display additional flaws referred to as Frenkel and Schottky faults.
- An example of interstitials is Carbon in Iron (Steel); Carbon atoms occupy interstitial sites in the iron lattice, making the metal stronger and harder.
RELATED QUESTIONS
Explain the following term with suitable examples:
Frenkel defect
Give reasons : In stoichiometric defects, NaCl exhibits Schottky defect and not Frenkel defect.
non-stoichiometric defects?
Out of NaCl and AgCl, which one shows Frenkel defect and why?
Answer the following question.
What type of stoichiometric defect is shown by ZnS and why?
Defect shown by non-ionic solids is ____________.
Defects in solids can be studied using
Frenkel defects are not found in alkali metal halides because ____________.
Which is not correct about the Schottky defects?
Assertion: No compound has both Schottky and Frenkel defects.
Reason: Both defects change the density of the solid.
Assertion: Due to Frenkel defect, there is no effect on the density of the crystalline solid.
Reason: In Frenkel defect, no cation or anion leaves the crystal.
Alkali halids do not show Frenkel defect because ____________.
Which of the following crystals does not exhibit Frenkel defect?
Silver halides generally show:
Which of the following defects decrease the density?
(i) Interstitial defect
(ii) Vacancy defect
(iii) Frankel defect
(iv) Schottky defect
Match the defects given in Column I with the statements in given Column II.
| Column I | Column II |
| (i) Simple vacancy defect | (a) shown by non-ionic solids and increases density of the solid. |
| (ii) Simple interstitial defect | (b) shown by ionic solids and decreases density of the solid. |
| (iii) Frenkel defect | (c) shown by non ionic solids and density of the solid decreases. |
| (iv) Schottky defect | (d) shown by ionic solids and density of the solid remains the same. |
Given below are two statements:
Statements I: Frenkel defects are vacancy as well as interstitial defects.
Statements II: Frenkel defect leads of colour in ionic solids due to the presence of F-centers.
Choose the most appropriate answer for the statements from the options given below:
The incorrect statement about the imperfections in solids is ______.
