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Combined Synchrotron and Neutron Strcutural Refinement of R-Phase in Ti50.75.Ni47.75.Fe1.50 Shape Memory Alloy
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Combined Synchrotron and Neutron Strcutural Refinement of R-Phase in Ti50.75.Ni47.75.Fe1.50 Shape Memory Alloy

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Abstract:

The crystal structure of R-phase in Ti50.75.Ni47.75.Fe1.50 shape memory alloy (SMA) has been studied at a temperature of (290 ± 7) K on cooling by combined synchrotron and neutron powder diffraction using Rietveld refinement with generalized spherical harmonic (GSH) description for preferred orientation (PO). The results showed that (i) no significant improvement in the crystallographic RWP-factor was found when the inversion center was removed from the 3 P model, suggesting that the space group was indeed 3 P and not lower symmetry 3 P neither m P31 and (ii) the refined atomic parameters were converging only when the 3 P space group was used in the refinement.

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Periodical:

Materials Science Forum (Volumes 495-497)

Pages:

255-260

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.495-497.255

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Online since:

September 2005

Authors:

H. Sitepu, J.P. Wright, T. Hansen, Daniel Chateigner, Heinz Günter Brokmeier, Clemens Ritter, Takaomi Ohba

Keywords:

Generalized Spherical Harmonic, Neutron Powder Diffraction, Phase Composition Analysis, Rietveld Refinement, R-Phase in Ti-Ni-Fe Ternary Alloy, Synchrotron Powder Diffraction

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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