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Which of the following defects, if prese...

Which of the following defects, if present, lowers the density of the crystal ?

A

Frenkel

B

Schottky

C

Edge dislocation

D

Constitution of F-centres

Text Solution

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The correct Answer is:
B
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Knowledge Check

  • Which of the following defect, if present, lowers the density of the crystal?

    A
    Frenkel
    B
    Schottky
    C
    Edge dislocation
    D
    Constitution of F-centres

  • 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. Which of the following defect, if present, lowers the density of the crystal ?

    A
    Frenkel
    B
    Schottky
    C
    Edge dislocation
    D
    Constitution of F - centres

  • No crystal is found to be perfect at room temperature. The defects present in the crystals can be stoichiometric or non-stoichiometric. Due to non-stoichiometric defects, the formula of the ionic compound is different from the ideal formula. For example, the ideal formula of ferrous oxide should be FeO but actually in one sample, it was found to be Fe_(0.93)O . This is because the crystal may have some ferric ions in place of ferrous ions. These defects change the properties of the crystals. In some cases, defects are introduced ot have crystals of desired properties as required in the field of electronics. Doping of elements of group 14 with those of group 13 or 15 is most common. In ionic compounds, usually the impurities are introduced in which the cation has higher valency than the cation of the parent crystal e.g., SrCl_(2) into NaCl. Which one of the following defects does not affect the density of the crystal ?

    A
    Schottky defect
    B
    Interstitial defects
    C
    Frenkel defect
    D
    Both (A) and (B)

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