Question

What types of stoichiometric defects are shown by Cscl and agbr?

Answer 1

Agbr has frenkel defect And cscl is schottky defect

Answer 2

CsCl exhibits Schottky defects whereas AgBr exhibits Frenkel and Schottky defects.

Explanation:

CsCl shows Schottky defects:

• Cesium chloride with chemical formula CsCl is an ionic solid.
• The substance in which the size of the constituents ions namely cation and anion are almost similar in size exhibits Schottky's effects.
• Accordingly, in the case of CsCl, the anion is chlorine and the cation is cesium and the size of the ions is 1.81nm and 1.74nm respectively.
• Due to this close size of the radius, CsCl exhibits Schottky's effect.

AgBr shows Frenkel and Schottky defects:

• Silver bromide with chemical formula AgBr is an ionic solid.
• The size of $Ag^+$ ion is small due to which it dislocates itself from its normal site to interstitial site. Thus it is inferred to show Frenkel defect.
• On the other hand, the size of $Ag^+$ and $Br^-$ is almost close due to which it exhibits Schottky defects.

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