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CaF is partof bcc inwhich the Ca 2+ is located at the body centred F - is located atthe corners of the unit cell thus co-ordination numberof Ca 2+ is 8 and co-ordination number of F - is 4. similarly in AB 2 The co-ordination number of A 2+ is 8, whereas B - ion co-ordination number is 4.

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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?

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44. An ionic compound AB₂ possess CaF₂type crystal structure. What the co-ordination number of A²⁺ and B^– ions in crystal of AB₂ explain.

CaF is partof bcc inwhich the Ca²⁺is located at the body centred F^-is located atthe corners of the unit cell thus co-ordination numberof Ca²⁺is 8 and co-ordination number of F^-is 4. similarly in AB₂ The co-ordination number of A²⁺ is 8, whereas B^- ion co-ordination number is 4.

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