Home › Maharashtra HSC Class 12 (Science) › chemistry › Solid State › Schottky defect lowers the density of the crysta…
Schottky defect lowers the density of the crystal because
Aions move to interstitial sites (typical)
Bextra electrons enter holes
Clattice expands due to heat
Dequal numbers of cations and anions are missing
Answer & Solution
Correct answer: D. equal numbers of cations and anions are missing
1. In a Schottky defect, pairs of one cation and one anion are missing from lattice sites.
2. The mass decreases while the unit-cell volume is essentially unchanged.
3. Density = mass/volume falls, so the crystal becomes slightly less dense.
_Source: Maharashtra Balbharati Std XII Chemistry, Ch 1 "Solid State" §1.10_
Related questions
A pure semiconductor at absolute zero temperature behaves asF-centres are responsible for the colour of crystals such as NaCl heated in sodium vapour A Frenkel defect involvesPacking efficiency of a simple cubic (SC) arrangement is approximatelyCoordination number of an atom in an FCC lattice isThe relation between edge length a and radius r of an atom in BCC arrangement isIn a face-centred cubic (FCC) cell, total number of effective atoms isNumber of atoms per unit cell of a body-centred cubic (BCC) lattice is