Abstract
The hyperfine field distributions were determined from Mössbauer spectra of Fe 91Zr 9 taken for 6 K < T < 230 K. As in other alloys with invar behaviour, the distribution consists of a high field peak and a broad low field tail. Measurements in external magnetic fields show the ferromagnetic nature of the spin coupling. No evidence was found of an antiferromagnetic component at low fields. For Zr-rich alloys, the distribution of quadrupole splitting was evaluated from the spectra and compared with that found for metastable crystalline alloys. The differences between the two distributions suggest that important changes occur in the short-range order on crystallization.
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