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7 Cards in this Set

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Frenkel pairs:




One such type of defect involves a ---and---.

cation vacancy


and


a cation-interstitial pair

It might be thought of as being formed by a cation ----and----.

leaving its normal position


and


moving into an interstitial site


  • There is no change in charge

because


the cation -----.





  • This is called a ---.


  • maintains the same positive charge as an interstitial

  • frenkel defect

e.g.,





  • closed packed structures have ---and--- defects,

because



  • ----- is required to force the atom into a new position.


  • fewer interstalices and frenkel




  • additional energy

Schottky defect:




The removal of a positive ion to create a vacancymust be counter balanced by the removal of a negative ion in order to maintain ----.




The ---- is termed as schottky defect.

neutrality




pair of vacancies

e.g.,


with a sodium chloride crystal,


the removal of a positive sodium ion is balanced


by the removal of a ---- ion in order to maintain neutrality.

negative chlorine

Figure.