[en] The crystallization of Fe-P amorphous alloys was studied by using energy dispersive X-ray diffraction (EDXD), thermomagnetic and Moessbauer measurements. Especially EDXD proved to be useful, because its very short exposure time enabled us to perform isothermal crystallization measurements under a practically continuous control by diffraction spectra. By measuring the intensity of the appropriate diffraction lines, the crystallization kinetics of each phase could be recorded simultaneously. At 610K the crystallization of an Fesub(81.2)Psub(18.8) amorphous alloy was found to start within 5 minutes as the primary crystallization of α-Fe. This step is followed by the eutectic crystallization of the stable phases α-Fe and Fe₃P. (author)