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Incommensurate Structures in Rhenium Disilicide

Published online by Cambridge University Press:  02 July 2020

A. Misra ,
F. Chu  and
T.E. Mitchell
A. Misra
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, MS K765, Los Alamos, NM, 87545.
F. Chu
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, MS K765, Los Alamos, NM, 87545.
T.E. Mitchell
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, MS K765, Los Alamos, NM, 87545.
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The binary ReSi2 and ternary (Mo,Re)Si2 alloys are of interest due to potential applications as infrared detectors [1]. Also, Re may be a beneficial alloying element to MoSi2 which is a potential high temperature structural material [2]. A recent study of the structure of ReSi2 by X-ray diffraction (XRD) revealed an orthorhombic distortion (a= 0.3121 nm, b= 0.3139 nm and c= 0.7670 nm) from the tetragonal CI lb MoSi2 structure and a Si-deficient composition of Re4Si7 [3]. Further, a weak monoclinic distortion (β=89.87°) was also inferred from high-resolution XRD [3]. In the present investigation, the orthorhombic distortion and the Si-deficient stoichiometry were confirmed by XRD and the structure of arc-melted Re4Si7 studied by transmission electron microscopy (TEM).

A bright field (BF) TEM image and the corresponding [010] zone axis selected area diffraction pattern (SADP) are shown in Fig. 1. In addition to the fundamental reflections for tetragonal Cllb MoSi2 structure,

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 534 - 535
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Becker, J.P., Mahan, J.E. and Long, R.G., J. Vac. Sci. Tech. A, 13 (1995) 1133.CrossRefGoogle Scholar
2.Mitchell, T.E., Castro, R.G., Petrovic, J.J, Maloy, S.A., Unal, O. and Chadwick, M.M., Mat. Sci. Eng., A155 (1992) 241.CrossRefGoogle Scholar
3.Gottlieb, U., Lambert-Andron, B., Nava, F., Affronte, M., Laborde, O., Rouault, A. and Madar, R., J. Appl. Phys., 78 (1995) 3902.CrossRefGoogle Scholar
4.Janssen, T. and Janner, A., Advances in Physics, 36 (1987) 519.CrossRefGoogle Scholar
5. This research was funded by DOE, Office of Basic Energy Sciences.Google Scholar