Electron diffraction from modulated structures. II. Application to the ternary modulated phase NiGeP

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Abstract
For pt.I see ibid., vol.19, p.3497 (1986). The extraction of quantitative information from large angle, satellite dark field, convergent beam diffraction patterns taken from the incommensurately modulated ternary phase NiGeP is described. Expressions for the incommensurate satellite structure factors are derived in terms of an initially unconstrained phonon eigenvector. The little-co-group of the modulation wave-vector is used to derive the normal modes of the unmodulated lattice and the appropriate eigenvectors for two of the modulations observed in experiment. By fitting the variation of satellite diffraction intensity with incident orientation to that observed experimentally, the eigenvector components of one of these are determined.

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