Regensburg 2002 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 6: Poster: Neue Methoden

CPP 6.7: Poster

Montag, 11. März 2002, 13:30–15:00, B

STRUCTURE OF U-Mo-OXIDE GROWN BY SOLID PHASE REACTION METHOD — •Nikolai Zakharov and Peter Werner — Max Planck Institute of Microstructure Physics, Weinberg 2, 06120 Halle, Germany

The crystal structure of U-Mo oxide prepared by solid phase reaction method have been determined by High Resolution Transmission Electron Microscopy (HRTEM) and Selected Area Electron Diffraction (SAD). The composition of new phase was investigated by Energy Dispersive X-ray microanalysis (EDX) in transmission mode. Unit cell is orthorhombic, s.g. Cccm, with dimensions: a=0.72, b=3.2 and c=0.82 nm. The basic structure is formed by corner sharing MoO₆ octahedra. The slabs of ReO₃-type and two MoO₆ octahedra wide are separated by the blocks of Hexagonal Tungsten Bronze (HTB)-type structure two row of hexagonal tunnels wide. Hexagonal tunnels are filled by -O-U-Mo-O-U-strings. In some crystals incommensurate modulations have been observed.