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The Ir3Ge7 (D8f) Structure: an Electron Phase Related to γ-Brass

Published online by Cambridge University Press:  15 February 2011

D. Swenson
D. Swenson*
Affiliation:
Department of Metallurgical and Materials Engineering, Michigan Technological University, 1400 Townsend Drive, Houghton, MI 49931
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Abstract

The crystallographic similarity between the Ir3Ge7 (D8f) and γ-brass (Cu5Zn8, D82) structures is discussed. By considering all phases known to possess the Ir3Ge7 structure, it is shown that phases of this structure type obey essentially the same electron concentration rules as does γ-brass, possessing on average 22 atoms/formula unit. Based on crystal-chemical considerations, it is further suggested that the Ir3Ge7 structure may be considered to be a structural derivative of γ-brass, in which 12 atoms have dropped out of the γ-brass lattice and the remaining atoms have undergone a certain amount of rearrangement in order to accommodate such a large concentration of vacancies. Finally, as further support of this idea, the phase NiGa4 is presented as an example of another γ-brass derived structure which contains crystallographic features of both γ-brass and the Ir3Ge7 structure.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 367
Copyright
Copyright © Materials Research Society 1997

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References

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