  Issues pertinent to the miscibility gap at 800K in a Fe73.7Cr26.3 alloy viz.
the kinetics of the phase decomposition and borders of the latter were
investigated by means of the M\"ossbauer-effect spectroscopy. The kinetics was
revealed to well follow the Johnson-Mehl-Avrami-Kolgomarov equation testifying
to a nucleation and growth mechanism underlying the decomposition. A solubility
limit of Cr in the Fe matrix was determined to be 17.3(6) at.% and that of Fe
in the Cr matrix was found as equal to 18.5(9) at.%. The results obtained have
been compared with various theoretical predictions.
