Crystal Research and Technology
Cryst. Res. Technol. 35 (2000) 409 - Abstract -

D. W. Hough, U. Jaenicke-Roessler, G. Zahn, A. Belger, A. Guembel*, C.-G. Oertel, W. Skrotzki

Institut für Kristallographie und Festkörperphysik, Technische Universität Dresden, Germany
*Institut für Festkörper- und Werkstofforschung Dresden, Germany

Structural Characterization of Y2Pd14B5

Y2Pd14B5 is the major phase in as-cast and annealed multiphase alloys with nominal compositions near YPd5B3C0.3. Its crystal structure determined the first time here by single crystal X-ray diffraction is body-centered tetragonal (space group I41/amd). Transmission electron microscopy (TEM) reveals that in as-cast specimens the tetragonal phase has a modulated structure and is oriented intergrown with a face-centered cubic phase of similar composition, namely YPd7B2. According to Rietveld analyses of the multiphase system the structure of this phase can be well-described by space group Fm m. Annealing the sample for 150 hrs at 973 K results in a coarsening and enrichment of the tetragonal phase as well as a disappearance of the modulations allowing a detailed structure analysis by single crystal diffractometry.

Keywords: Y2Pd14B5, X-ray diffraction, structure analysis, transmission electron microscopy (TEM), oriented intergrowth


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