Defect

Difference Between Schottky Defect and Frenkel Defect

Difference Between Schottky Defect and Frenkel Defect

Schottky defect occurs in those ionic crystals where difference in size between cation and anion is small. ... In Schottky defect, both cation and anion leave the solid crystal. In Frenkel defect, only the smaller ion (cation) leaves its original lattice site; whereas, the anion remains in original lattice sites.

  1. Which shows both Frenkel and Schottky defects?
  2. What is Schottky defect give an example?
  3. What is meant by Frenkel defect?
  4. What is Schottky defect class 12?
  5. Does KCl show Frenkel defect?
  6. Does AgCl show Frenkel defect?
  7. What are consequences of Schottky defect?
  8. How is Schottky defect calculated?
  9. What is Frenkel defect example?
  10. Which one is not related to Frenkel defect?
  11. What is sprinkled effect?

Which shows both Frenkel and Schottky defects?

In AgBr, Ag+ ion is small in size and when removed from lattice point they can occupy interstitial sites and hence show both Frenkel and Schottky defects.

What is Schottky defect give an example?

Examples. This type of defect is typically observed in highly ionic compounds, highly coordinated compounds, and where there is only a small difference in sizes of cations and anions of which the compound lattice is composed. Typical salts where Schottky disorder is observed are NaCl, KCl, KBr, CsCl and AgBr.

What is meant by Frenkel defect?

The Frenkel defect (also known as the Frenkel pair/disorder) is a defect in the lattice crystal where an atom or ion occupies a normally vacant site other than its own. As a result the atom or ion leaves its own lattice site vacant.

What is Schottky defect class 12?

Definition. Schottky defect is a type of point defect or imperfection in solids which is caused by a vacant position that is generated in a crystal lattice due to the atoms or ions moving out from the interior to the surface of the crystal.

Does KCl show Frenkel defect?

In case of KCl, the cation and the anion are of comparable size while in case of LiI, the cation Li+ is very small as compared to the iodide ion, I-. Hence, KCl is more likely to show Schottky defect while LiI tends to show Frenkel defect.

Does AgCl show Frenkel defect?

AgCl shows Frenkel defect while NaCl does not.

Frenkel defect is shown by those in which there is large difference in the size of cations and anions. Hence, Frenkel defect is shown by AgCl due to small size of Ag+ ion but not by NaCl because alkali metal ions can not fit into interstital sites.

What are consequences of Schottky defect?

Consequences of Schottky defect: Density of the crystal decreases. The crystal begins to conduct electricity to small extent by ionic mechanism. The presence of too many voids lowers the lattice energy or the stability of the crystal.

How is Schottky defect calculated?

The number of Schottky defects (n) present in an ionic compound containing N ions at temperature Tis given by n = Ne E/2KT, where E is the energy required to create 'n' Schottky defects and K is the Boltzmann constant. If the mole fraction of Schottky defect in NaCl crystal at 2900 K is X.

What is Frenkel defect example?

Frenkel defects are mostly exhibited in ionic solids where the smaller ion (usually the cation) is dislocated. Some examples include AgBr, ZnS, AgCl, and AgI. Here the defect occurs mainly due to the smaller size of Zn2+ and Ag+ ions.

Which one is not related to Frenkel defect?

KBr exhibits Schottky defect and not Frenkel defect.

What is sprinkled effect?

In Frenkel defect, an ion is displaced from its lattice place to an interstitial place. So, there is no loss or gain of ions in lattice structure. It involves only the migration of the ions within the crystal, thus preserving both volume and mass.

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