What is the defect exhibted by the ionic crystal when the difference in the size of cations and anions is large?

Defectless crystal

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Schottky defect

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Both Schottky and Frenkel defects

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Frenkel defect

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Open in App

Solution

The correct option is D Frenkel defect
When an ion is displaced from its regular position to an interstitial position, it creates a vacancy. This defect is called Frenkel defect.

Characteristics of Frenkel defects:
1. It occurs in ionic crystals which have a large difference in sizes between the positive and negative ions.
2. The coordination number of ionic crystals showing this defect is usually low.
3. Frenkel defect does not change density.
4. $Z n S, A g C l, A g B r & A g I$ show Frenkel defects.

Suggest Corrections

Similar questions

Q. Statement 1: KCl is more likely to show schottky defect while Lil is more likely to show Frenkel defect.
Statement 2: Schottky defect is more likely in ionic solids in which cations and anions are of comparable size while Frenkel defect is more likely is which cations and anions have large differences in their ionic sizes.

Q. Why cations are smaller in size and anions are bigger in size in case of Ionic crystals?

Q. Assertion :Large number of Schottky defects lead to lowering in density of crystal lattice. Reason: The defect is due to missing cation and anion. Equal numbers of cations and anions are missing to maintain electroneutrality.

Read the above assertion and reason and choose the correct statement regarding it.

Q. Assertion :Frenkel defect is also called dislocation defect. Reason: Frenkel defect is shown by ionic substances in which cation and anion are almost similar sizes.

The CsCl type structure is exhibited by alkali halides only when the radius of the cation is large enough to keep touching its eight nearest neighbour anions. Below what minimum ratio of cation to anion radii $(\frac{r_{+}}{r_{-}})$ this contact is prevented ?

Join BYJU'S Learning Program

Explore more

VSEPR Theory

Standard XII Chemistry

Join BYJU'S Learning Program