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Chemistry LibreTexts

Incommensurate modulated structure

An incommensurate modulated crystal structure is a modulated crystal structure, for which the  modulation  function has a Fourier transform of sharp peaks at wave vectors that cannot all be expressed by rational  coefficients  in a basis of the reciprocal  lattice of the basic structure. At least one of the components of the wave vectors of the modulation with respect to the basis structure should be irrational.