begin mathsize 36px style 1 over d squared equals 4 over 3 open parentheses fraction numerator h squared plus h k space plus space k squared over denominator a squared end fraction close parentheses plus space l squared over c squared end style

d= Interplanar Spacing ; h , k , l = Miller Indices; a ,c = Lattice Constants

d

c

h

k

l

a

 

Hexagonal Structure is very similar to the Tetragonal Structure; among the three sides, two of them are equal (a = b ≠ c). Two of the interaxial angles are 90 while the third is 120α = β = 90; γ = 120o). The D-spacing and the miller indices are related by the above equation. 

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