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Packing Fraction and Efficiency

How many latt...

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How many lattice points are there in one unit cell of each of the following ? a) FCC b) BCC c) Edge centered

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Q. How many lattice points are there in one unit cell of each of the following lattice - Face-centered tetragonal

How many lattice points are there in one unit cell of each of the following lattice ?

(i) Face-centred cubic

(ii) Face - centred tetragonal

(iii) Body - centred

Q. A metal crystallizes into two cubic phases, face centered cubic (FCC) and body centered cubic (BCC), whose unit cell length are

4.5 \circ A

3 \circ A

, respectively. Calculate the ratio of the densities of the BCC to the FCC lattice.

Q. Unit cells can be divided into two categories, primitive and centered unit cells.
(a) Differentiate between Unit Cell and Crystal Lattice?
(b) Calculate the number of atoms per unit cell in the following:
(i) Body centered cubic unit cell (bcc)
(ii) Face centered cubic unit cell (fcc)

Q. A certain element crystallises in a bcc lattice of unit cell edge length

27 \circ A

. If the same element under the same conditions crystallises in the fcc lattice, the edge length of the unit cell in

\circ A

will be (Round off to the nearest Integer).
[Assume each lattice point has a single atom]

[Assume \sqrt{3} = 1.73, \sqrt{2} = 1.41]

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