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A Long-Period Close-Packed Phase of the PuGa3 Type Prepared by RSP: m-Nb (Rh.75 Pd.25)3

Published online by Cambridge University Press:  26 February 2011

M. X. Quan ,
P. Haldar  and
B. C. Giessen
M. X. Quan
Affiliation:
Barnett Institute and Department of Chemistry, Northeastern University, Boston, MA 02115 Institute of Metal Research, Academia Sinica, Shenyang, Liaoning, China
P. Haldar
Affiliation:
Barnett Institute and Department of Chemistry, Northeastern University, Boston, MA 02115
B. C. Giessen
Affiliation:
Barnett Institute and Department of Chemistry, Northeastern University, Boston, MA 02115
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Abstract

In the pseudobinary system Nb(Rh1−xPdx)3, as in other similar alloy systems, a series of polytypic phases occurs which have related, closepacked structures with systematically varying stacking sequences. After rapid quenching from the melt, the stacking sequence of these polytypes is often changed.

A phase m-Nb(Rh.75Pd.25)3 of the PuGa3 type with a 12-layer stacking sequence has been prepared by RSP; this phase is probably metastable and displaces an equilibrium phase of the VCo3 type with a 6-layer structure. Occurrence of the m phase can be rationalized in terms of the sequence of the Jagodzinski notation (fraction of h-like packing) and the variation of the diffraction pattern with composition.

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