The Interplanar Distance d-Spacing of Different Crystal Systems

Therefore, V is also reciprocal of the volume of the unit cell of the direct lattice and the relations between the angles are 

6 The Interplanar Distance (d-Spacing) of Different Crystal Systems 

The interplanar distance dhki in the direct lattice is related to the corresponding vector Hhki in reciprocal space by the relation 

This is the general expression for the d-value and is valid for triclinic system for which a. h c and a / 7. The expression becomes much simplified in the other systems having increasing S5unmetry like  

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