Modulated Structures CIF Dictionary version 1.0

_cell_reciprocal_basis_description

Name

Category: cell

Data type: char

Examples:

;              a*,b*,c* (reciprocal basis spanning the lattice of main

               reflections) and q (incommensurate with respect to a*,b*,c*)

;

 

;

   Example 1 - Typical choice for a one-dimensional incommensurate structure.

;

 

    

;              The diffraction pattern can be indexed with four integers based

               on the reciprocal vectors a*~1~=a*~11~, a*~2~=a*~12~,

               a*~3~=a*~13~,a*~4~=a*~21~. a*~1j~ (j=1,2,3) index the

               main reflections of the 1st subsystem. a*~21~ is incommensurate

               with a*~11~.

;

 

;

   Example 2 - Common choice for a misfit layer compound composed of two

               subsystems that have in common two reciprocal vectors. Extracted

               from van Smaalen [(1995). Cryst. Rev., 4, 79-202]

;

 

    

Definition
    	

   Definition of the higher-dimensional basis with respect to which
   the Miller indices are defined. The three-dimensional basis used
   to index the additional wave vectors should be clearly indicated.
 



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