Structural study of R-phase in Ti-50.23 at. %Ni and Ti-47.75 at. %Ni-1.50 at. %Fe alloys

Abstract

The crystal structure of the R-phase was determined by combined use of the electron diffraction and the powder X-ray diffraction method. The Rietveld method was applied for the analysis of the powder diffraction data. The structure of the R-phase belongs to the space group P3 and is similar to that of ζ′2 Au-Cd martensite. The deviations of the atomic coordinates from the mirror plane of the P31m are smaller than that of ζ′2 Au-Cd. The convergent beam electron diffraction patterns were also observed and discussed with the results.