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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
Answer the following question.
What type of stoichiometric defect is shown by ZnS and why?
Defect shown by non-ionic solids is ____________.
Point defect is also known as ____________.
Frenkel defects are not found in alkali metal halides because ____________.
The radius of Cs+ is 169 pm and Cl− is 181 pm. The radius ratio is ____________.
Type of stoichiometric defect shown by ZnS is ____________.
Type of stoichiometric defect shown by AgBr is ____________.
The following diagram shows:
Schottky defect defines imperfection in the lattice structure of ____________.
Which is not correct about the Schottky defects?
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 ____________.
What is the effect of Frenkel defect on the density of ionic solids?
Which of the following point defects are shown by AgBr(s) crystals?
- Schottky defect
- Frenkel defect
- Metal excess defect
- Metal deficiency defect
Frenkel defect is also known as:
(i) stoichiometric defect
(ii) dislocation defect
(iii) impurity defect
(iv) non-stoichiometric 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. |
If NaCl is doped with 10–4 mole percent of SrCl2 the concentration of cation vacancies will be
The incorrect statement about the imperfections in solids is ______.
