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Structural Characterization of Y 2 Pd 14 B 5
Author(s) -
Hough D.W.,
JaenickeRoessler U.,
Zahn G.,
Belger A.,
Guembel A.,
Oertel C.G.,
Skrotzki W.
Publication year - 2000
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200004)35:4<409::aid-crat409>3.0.co;2-5
Subject(s) - tetragonal crystal system , transmission electron microscopy , crystal structure , crystallography , annealing (glass) , materials science , rietveld refinement , phase (matter) , diffraction , chemistry , metallurgy , optics , nanotechnology , physics , organic chemistry
Y 2 Pd 14 B 5 is the major phase in as‐cast and annealed multiphase alloys with nominal compositions near YPd 5 B 3 C 0.3 . Its crystal structure determined the first time here by single crystal X‐ray diffraction is body‐centered tetragonal (space group I4 1 /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 YPd 7 B 2 . 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.