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Which type of 'defect' has the pressence...

Which type of 'defect' has the pressence of cations in the interstitial sites?

A

Schottky defects

B

Vacancy defect

C

Frenkel defect

D

Metal deficiency defect

Text Solution

Verified by Experts

The correct Answer is:
C
When cation shifts from lattice to interstitial site, the defect is called Frenkel defect
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Which type of defect has the presence of cations in the interstitial sites ?

Assertion (A) : Non-stoichiometric compounds are called Bertholide compounds. NaCl and KCl crystal, when heated in an atmosphere of Na and K varpours, respectively, they impart violet and yellow colours to NaCl and KCl , respectively. Reason (R ) : Metal excess defect is due to the presence of extra cations atg the interstitial sites. The excess metal ions move to the interstitial sites and the electrons to the neighbouring sites. The colour results byt the excitation of these electrons by absorbing suitable energy from visible light. When the excited electroon comes back to the ground state, there is emission of radiation in the visible region and gives complimentary colour.

Cations are present in the interstitial sites in …………… .

What are voids or interstitial sites ?

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