Home
Class 12
CHEMISTRY
What is Schottky defect ?...

What is Schottky defect ?

Text Solution

Verified by Experts

Schottky defect :
1) It is a point defect in which an atom or ion is missing from its normal site in the lattice .
2) In order to maintain electrical neutrality , the number of missing cations and anions are equal .
3) This sort of defect occurs mainly in highly ionic compounds , where cationic and anionic sizes are similar .
In such compounds the co-ordination number is high .
Ex . : NaCl , CsCl , etc .
4) Illustration :

5) This defect decreases the density of the substances .
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • SOLID STATE

    VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise SHORT ANSWER QUESTIONS|16 Videos

  • SOLID STATE

    VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise LONG ANSWER QUESTIONS|8 Videos

  • SOLID STATE

    VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise INTEXT QUESTIONS|27 Videos

  • POLYMERS

    VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise INTEXT QUESTIONS|6 Videos

  • SOLUTIONS

    VIKRAM PUBLICATION ( ANDHRA PUBLICATION)|Exercise INTEXT QUESTIONS|10 Videos

Similar Questions

Explore conceptually related problems

Explain the following terms with suitable examples: (i) Schottky defect (ii) Frenkel defect (iii) Interstitials and (iv) F-centres.

Write short notes on : (a) Schottky defect (b) Frenkel defect

Knowledge Check

  • Schottkey defects -

    A
    Are common is alkalimetal halides
    B
    Are stoichiometric defects
    C
    Are thermodynamic defects
    D
    Cause drop in density

  • Schottky defect causes

    A
    Increase in the density of solid
    B
    Decrease in the density of solid
    C
    No change in the density of solid
    D
    Decrease in the conductivity of solid.

  • (A) Schottky type defect is shown by crystals with high coordination number. (R) In crystals with Schottky defect cations always occupy interstitial positions

    A
    Both (A) and (R) are true and (R) is the correct explanation of (A)
    B
    Both (A) and (R) are true and (R) is not the correct explanation of (A)
    C
    (A) is true but (R) is false
    D
    Both (A) and (R) are false

    • Similar Questions

    Explore conceptually related problems

    (A) The presence of a large number of Schottky defects in NaCZ lowers its density. (R) In NaCZ, there are approximately 10^(6) Schottky pairs per 1 cm3 at room temperature.

    (A) In any ionic solid with Schottky defects the number of positive and negative ions is same. (R) Equal number of cation and anion vacan­cies are present

    If an element (at. wt. = 50) crystal in foc lattice, with a = 0.50 nm. What is the density of unit cel if it contains 0.25 % . Schottky defects (use N_(A) = 6 xx 10^(23) ) ?

    Which among the following is likely to have Schottky defect.

    Which among the following is likely to have Schottky defect.

    Home
    Profile