Crystal chemistry of the G-phases in the systems Ti–{Fe, Co, Ni}–Al with a novel filled variant of the Th6Mn23-type

The crystal structures of the compounds Ti6M7Al17 with M=Fe,Co,Ni have been investigated by X-ray powder and single crystal, neutron powder and electron diffraction. These compounds crystallize with a new filled variant of the Mg6Cu16Si7-type (space group Fm3m). A close structural relation is encoun...

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Bibliographic Details
Published in:Intermetallics 2003-04, Vol.11 (4), p.351-359
Main Authors: Grytsiv, Andriy, Ding, Jin Jun, Rogl, Peter, Weill, François, Chevalier, Bernard, Etourneau, Jean, André, Gilles, Bourée, Françoise, Noël, Henri, Hundegger, Peter, Wiesinger, Günter
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
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Summary:The crystal structures of the compounds Ti6M7Al17 with M=Fe,Co,Ni have been investigated by X-ray powder and single crystal, neutron powder and electron diffraction. These compounds crystallize with a new filled variant of the Mg6Cu16Si7-type (space group Fm3m). A close structural relation is encountered for the series of crystal structures: Th6Mn16Mn7?, Mg6Cu16Si7?, Sc6Sc16Ir7lr, Zr6Zn16Zn7Si, Ti6Al16M7Al, and Ti6Ni16Si7Si. Electrical resistivity of the Fe, Co-based compounds is typical metallic and temperature dependence follows the Bloch Gruneisen relation with a Debye temperature of about 300 K. No hydrogen was found to be absorbed in the Fe-, and Co-based compounds at room temperature under a H2 pressure of 5 MPa.
ISSN:0966-9795
DOI:10.1016/S0966-9795(02)00267-4