Abstract
Condensed cluster phases with the nominal compositions Ln 14(C 2) 3I 20 (Ln = La, Ce, Pr) are strongly disordered by a lamellar intergrowth. The thickness and composition of layers of clusters containing n (C 2)Ln 6 octahedra linked via opposite edges is determined by n. The disorder is characterized by variations of n as well as by variations of the thickness of lamellae containing only one kind of cluster. As a rule, the crystals are built from straight lamellae with constant n, however, large variations of n were occasionally observed giving rise to bending and truncation of the lamellae inside compact crystals. The power of electron microscopy techniques for the characterization of such phasoid-type real crystals is demonstrated and the structure of the new compound Pr 14(C 2) 3I 20 is presented.
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