  A series on nanocrystalline Fe100-xCrx alloys prepared by mechanical alloying
was investigated with X-ray diffraction (XRD), scanning electron microscopy
(SEM) and M\"ossbauer spectroscopy (MS) techniques. XRD and SEM were used to
structurally characterize the samples whereas MS permitted phase analysis as
well as determination of the Debye temperature, Theta_D. Concerning the latter,
an enhancement relative to bulk Theta_D-values was revealed in the range of ca.
40 < x <50. In a sample of Fe55.5Cr44.5 two phases were detected viz. (1)
crystalline and magnetic with Theta_D=572(56) K and (2) amorphous and
paramagnetic with Theta_D=405(26) K.
