Question: Draw a tetragonal unit cell and mark on it a set of points that would define (a) A face-centred lattice (b) A body-centred lattice. Demonstrate,

Draw a tetragonal unit cell and mark on it a set of points that would define 

(a) A face-centred lattice 

(b) A body-centred lattice. 

Demonstrate, by considering two adjacent unit cells, that a tetragonal face-centred lattice of dimensions a and c can always be redrawn as a body-centred tetragonal lattice with dimensions a/√2 and c.

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