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Anomalous Small Angle X-Ray Scattering Studies of Metal-Germanium Alloys

Published online by Cambridge University Press:  21 February 2011

Marybeth Rice ,
Soichi Wakatsuki  and
Arthur Bienenstock
Marybeth Rice
Affiliation:
Stanford University, Department of Electrical Engineering, Stanford, CA 94305
Soichi Wakatsuki
Affiliation:
Stanford University, Department of Chemistry, Stanford, CA 94305
Arthur Bienenstock
Affiliation:
Stanford Synchrotron Radiation Laboratory, Bin 69, P. O. Box 4349, Stanford, CA 94309
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Abstract

The tunability of synchrotron radiation was used to perform anomalous small angle x-ray scattering (ASAXS) experiments on amorphous metal-germanium (a-Mx Ge1−x) alloys with the aim of detecting and characterizing compohitioK modulation and phase separation. Small angle x-ray scattering is sensitive to electron density fluctuations on a scale of tens to thousands of Angstroms. The combination of SAXS with the anomalous dispersion effect allows one to distinguish composition modulation from density fluctuations arising from voids and defects. Data gathered from a-FexGe1−x and a-WxGe1−x samples in the low metal concentration regime show nanometer scale composition modulation. In these samples the density of Ge atoms is uniform throughout the sample. The small angle x-ray scattering arises from fluctuations in the density of metal atoms.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 187: Symposium J – Thin Film Structures and Phase Stability , 1990 , 53
Copyright
Copyright © Materials Research Society 1990

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