Those defect which lead to change in composition of solids are called non-stoichiometric defects.They are most often inorganic compounds, and almost always solids They contain constituting particles in non-stoichiometric ratio, e.g., Fe0.93 O1.0, Ni0.94 O1.0 are examples of non-stochiometric compounds.
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42.What is the arrangement of Zn2+ and S2– ions in Zinc blende (ZnS) crystal structure?
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43.explain the effect of Frenkel structural defect on the electrical conductance of a crystalline solid?
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44.An ionic compound AB2 possess CaF2 type crystal structure. What the co-ordination number of A2+ and B– ions in crystal of AB2 explain.
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45.What kind point defect lowers the density of a crystal?
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46.What do you mean by ‘point defects' in crystals?
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47.Define dislocation in crystals.
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48.Explain the term ‘dislocations’ in relation to crystals?
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49.Why does zinc oxide exhibit enhanced electrical conductivity on heating?
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50.In a body centred unit cell, one of the diagonals contains two extra atoms. Find the number of atoms present per unit cell?
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