Examine the defective crystal given below and answer the question that follows:
$A^{+}$ $B^{-}$ $A^{+}$ $B^{-}$ $A^{+}$
$B^{-}$ $B^{-}$ $A^{+}$ $B^{-}$
$A^{+}$ $B^{-}$ $A^{+}$ $A^{+}$
$B^{-}$ $A^{+}$ $B^{-}$ $A^{+}$ $B^{-}$
State if the above defect is stoichiometric or non-stoichiometric. How does this defect affect the density of the crystal? Also, write the term used for this type of defect.

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Solution

Given crystal has alternating $A^{+}$ and $B^{-}$ ions and are combined in exact whole numbers as $A_{n} B_{n}$ , therefore has stoichiometric defects. To maintain the charge neutrality equal number of cationic and anionic species are removed, hence has lower density than pure crystal. This type of defects are called Schottky defects.

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Similar questions

\begin{matrix} A^{+} & B^{-} & A^{+} & B^{-} & A^{+} B^{-} & O & B^{-} & A^{+} & B^{-} A^{+} & B^{-} & A^{+} & O & A^{+} B^{-} & A^{+} & B^{-} & A^{+} & B^{-} \end{matrix}

\begin{matrix} X^{+} & Y^{-} & X^{+} & Y^{-} & X^{+} Y^{-} & O & Y^{-} & X^{+} & Y^{-} X^{+} & Y^{-} & X^{+} & O & X^{+} Y^{-} & X^{+} & Y^{-} & X^{+} & Y^{-} \end{matrix}

A^{+} B^{-} A^{+} B^{-} A^{+}

B^{-} 0 B^{-} A^{+} B^{-}

A^{+} B^{-} A^{+} 0 A^{+}

B^{-} A^{+} B^{-} A^{+} B^{-}

Frenkel defect is also Known as ................

(a) stoichiometric defect (b) dislocation defect

N a C l

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