Abstract
In this paper we investigate the morphology of ((CH 3) 4N) 2ZnCl 4- x Br x ( x = 0 to 4) solid solution crystals in the inc mmensurate and lock-in phases by sphere growth experiments. On these spheres satellite faces appear, which give direct information about the crystal structure. The crystal structure can be described by a normal basic structure distorted by a displacive modulation with wave vector q , added to the classical 3D lattice. The sphere experiments reveal directly the phase transitions in the crystal structure as well as the magnitude of the modulation wave vector. As a result, we confirm the data on q as determined in X-ray diffraction experiments, and find in addition a new commensurate phase ( q = 4/11 c ∗ ) for x= 1.2 to 2.19 in between two incommensurate phases. We discuss the possible symmetry of this phase.
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