4. Explain Tetrahedral and Octahedral void?
5. What is packing Efficiency? Explain Packing efficiency in BCC and FCC Crystals?
6. What are Schottkey and Frenkel defects?
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Ans 4: --- Whenever the sphere of the second layer is above the void of the first layer a tetrahedral void is formed. These voids are called tetrahedral voids because a tetrahedron is formed when these four spheres are joined. Octahedral Voids: The void surrounded by six.
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