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MM: Fachverband Metall- und Materialphysik
MM 12: Postersitzung I
MM 12.37: Poster
Monday, March 14, 2011, 17:30–19:00, P5
Characterization of Complex Structures by means of Precession Electron Diffraction — Ulrich Schürmann1, Viola Duppel2, Saskia Buller3, Wolfgang Bensch3, and •Lorenz Kienle1 — 1Synthesis and Real Structure, Christian Albrechts University, Kaiserstr. 2, D-24143 Kiel, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany — 3Institute of Inorganic Chemistry, Christian Albrechts University, Max-Eyth-Straße. 2, D-24118 Kiel, Germany
Precession electron diffraction (PED) became a versatile tool for the advanced characterization of nanoscaled materials in the last years. The determination of the space group of a material is complicated when applying selected area electron diffraction (SAED) since the zonal and serial reflection conditions are often violated by multiple scattering. This effect can be reduced via PED, so the resulting patterns reflect those which are based on the kinematic approximation. Due to the less dynamic intensity the Laue symmetries and the space groups of the crystals can be determined fast and reliably and enables the ab-initio structure determination of unknown nanoscaled materials. Also the PED gives 3D structural information, e.g. about disorder. An experimental breakthrough related to the PED technique is revealed by the analysis of extremely electron beam sensitive samples like intermetallic phases with melting points around 100 °C. PED is also suitable for the characterization of homologous structures based on variable sequences of building units like in Phase Change Materials (PCM). Financial support by the DFG in the SPP1386 is gratefully acknowledged.