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Te defect that is more likely to occur i...

Te defect that is more likely to occur in almost all types of ionic crystals is

A

Non-stoichiometric defects

B

Schottky defect

C

Frenkel defect

D

All the above

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The correct Answer is:
B
Properties of ionic solid
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Examine the given defective crystal {:(A^(+), B^(-),A^(+),B^(-),A^(+)),(B^(-), O,B^(-), A^(+),B^(-)),(A^(+),B^(-),A^(+),O,A^(+)),(B^(-),A^(+),B^(-),A^(+),B^(-)):} Answer the following question : (i) What type of stoichiometric defect is shown by the crystal ? (ii) How is the density of the crystal affected by this defect ? (iii) What type of ionic substances show such defect ?

Any deviation from the perfectly ordered arrangement constitutes a defect or imperfection. The compounds in which the number of irregularity are present in the arrangement of atoms or ions are called atomic imperfections or point defects. These may be stochiometric or non - stoichlometric. Stoichiometric defects are further classified into Schottky defects in which number of positive and negative ions are missing in equal ratio and Frenkel defects in which an ion leaves its correct lattice sites and occupies on interstitial site. Schottky defect is more common in ionic compounds with high co-ordination number and where the size of positive and negative ions are almost equal, while in Frenkel defects are common in ionic compounds, which have low co-ordination number and in which there is large difference in size between positive and negative ions. When an ion leaves ir correct lattice and occupies interstital sites in its crystal lattice, it is called