Abstract
The intermetallic compound Fe0.5Co0.5Ti and its hydride phases Fe0.5Co0.5TiHx were investigated through transmission Mossbauer spectroscopy in the composition range 0<or=x<or=1 and a temperature range of 4.2 to 294K. The Mossbauer spectral data and X-ray diffraction data imply that the hydride consists of a mixture of two phases, alpha and beta . The spectra for both Fe0.5Co0.5Ti and the alpha -phase hydride are single lines with identical widths and isomer shifts, and the beta -phase spectrum is a quadrupole doublet. Any spectrum for a mixture of phases can be resolved as a sum of a single line and a quadrupole doublet; the relative spectral area of each component is proportional to the concentration of the phase to which the component corresponds. The Mossbauer parameters in the beta -phase can be explained in terms of the expansion and distortion of the lattice without having to introduce a direct effect arising from the hydrogen.
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