Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 476, Issue 1-2, Pages 282-287Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2008.08.078
Keywords
Na flux; X-ray powder diffraction; Electron diffraction; Rietveld analysis; Stacking fault
Categories
Funding
- DIFFaX
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beta-FeSi2 was synthesized by heating mixtures of Si and Fe powder sealed with Na metal and At gas in a stainless tube. Diffuse streaks elongated along the a axis were observed in the electron diffraction (ED) patterns of beta-FeSi2 prepared at 873 K in the Na melt. No streaks appeared on the spots indexed by k + l = 2n (n: integer), which indicated existence of stacking faults caused by a slip system of (10 0)[0 1 1]/2. The powder X-ray diffraction (XRD) patterns of the samples prepared at 873 K for 48 h in the Na melt and at 1173 K for 24 h under reduced Na vapor pressure were analyzed by the Rietveld method with a statistical split-site model based on the stacking fault structure. The powder X-ray diffraction patterns of the samples prepared at 873 K for 48 h in the Na melt and at 1173 K for 24 h in Na vapor which evaporated from a mixture of Na and Si were analyzed by the Rietveld method with a statistical split-site model based on the stacking fault structure. The ratios of the normal stacking layer and stacking fault layer of the samples prepared at 873 and 1173 K were estimated to be 0.95:0.05 and 0.84:0.16, respectively. Main features of the observed powder X-ray diffraction patterns were well reproduced by the calculation based on a general recursion method for calculating diffracted intensities from crystals containing stacking fault. (C) 2008 Elsevier B.V. All rights reserved.
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