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The Solid State

Short Answer Type

41. Define non-stiochiometry defect in crystals?

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42. What is the arrangement of Zn²⁺ and S^2– 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?

Frenkel Defect: This defect is shown by ionic solids. The smaller ion (usually cation) is dislocated from its normal site to an interstitial site . It creates a vacancy defect at its original site and an interstitial defect at its new location. this vacancy defect increase the Electrical conductance.

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