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Packing Fraction and Efficiency

Explain the c...

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Explain the calculation of radius of tetrahedral void

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Q. The radius of void in a closed packed tetrahedral is:

Q. For a tetrahedral void the correct relation between r and R is :
Here

r is radius of the tetrahedral void

R is radius of the atoms in close packing

Q. Calculate the radius of tetrahedral void present in the unit cell of an atom X which crystallizes in fcc unit cell having an edge length

a = 50 \sqrt{2} p m

Q. An atom crystallizes in a fcc unit cell having radius of

100 \sqrt{2} p m

.
Calculate the distance between the two tetrahedral voids which are formed on a same body diagonal

Q. In zinc blende structure, anions are arranged in ccp and cations are present in the tetrahedral voids and only half the tetrahedral voids are occupied.
For this type of structure, radius ratio,

\frac{r_{+}}{r_{-}}

should be in the range of

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