Peak positions as a function of unit cell dimensions

1 Peak positions as a function of unit cell dimensions 

The interplanar distance is a function of the unit cell parameters and Miller indices, h, k and /, which fully describe every set of crystallographic 

The usefulness of the reciprocal lattice concept may be once again demonstrated here by illustrating how easily Eqs. 2.29 to 2.34 can be derived in the reciprocal space employing reciprocal lattice vectors. When the derivation is performed in the direct space the geometrical considerations become quite complex. 

For example, in the orthorhombic crystal system a = p = y = 90°. Hence, Eq. 2.35 is transformed into 

In the general case (triclinic crystal system), the equivalent of Eq. 2.36 is more complex 

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