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Distinguish between crystal lattice and ...

Distinguish between crystal lattice and unit cell.

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Crystal lattice : It is the difinite three dimensional geometrical arrangement of constituent particles in a crystal
Unit cell: It is the smallest repeating portion which when repeated again and again in all the three dimensions results in the formation of a crystal. Crystal lattice is made up of unit cells.
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Knowledge Check

  • The regular three dimensional arrangement of points in a crystal is known as crystal lattice and the smallest repeating pattern in the lattice is called unit cell. The unit cells are characterised by the edge lengths a, b, c and the angles between them alpha, beta and gamma respectively. Based on this, there are seven crystal systems. In a cubic unit cell: a=b=c and alpha = beta=gamma=90^(@) The number of points in simple, body centred and face centred cubic cells are 1,2 and 4 respectively In both the hcp and ccp of spheres, the number of tetrahedral voids per sphere is two while the octahedral voids is one. In a face centred cubic cell, an atom at the face contributes to the unit cell

    A
    1 part
    B
    `1//2` part
    C
    `1//4` part
    D
    `1//8` part

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