Discoveries in real crystals of rare earth metal compounds by electron microscopy – Lamellar intergrowth and domains of phasoids
| Autor: | Viola Duppel, Manuel C. Schaloske, Hj. Mattausch, A. Simon, Lorenz Kienle |
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| Rok vydání: | 2008 |
| Předmět: |
Chemistry
General Chemistry Crystal structure Condensed Matter Physics law.invention Crystallography Octahedron Transmission electron microscopy law Cluster (physics) General Materials Science Lamellar structure Selected area diffraction Electron microscope High-resolution transmission electron microscopy |
| Zdroj: | Solid State Sciences. 10:401-407 |
| ISSN: | 1293-2558 |
| DOI: | 10.1016/j.solidstatesciences.2007.11.027 |
| Popis: | Condensed cluster phases with the nominal compositions Ln14(C2)3I20 (Ln = La, Ce, Pr) are strongly disordered by a lamellar intergrowth. The thickness and composition of layers of clusters containing n (C2)Ln6 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 Pr14(C2)3I20 is presented. |
| Databáze: | OpenAIRE |
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