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The formation of nanocrystalline structures is observed by heating amorphous melts of Fe-P-Si systems. The nanocrystal formation is accompanied by a 2-3-fold increase of the microhardness compared to the starting amorphous state. Amorphous melts containing minimal amounts of phosphorus and silicon but highest amounts of phases based on α-Fe show the greatest propensity to hardening. X-ray and microscopic studies indicate a three-stage crystallization process to the nanocrystal structures. -(VAVILOVA, V. V.; PALII, N. A.; KOVNERISTYI, YU. K.; TIMOFEEV, V. N.; Neorg. Mater. 36 (2000) 8, 945-949; Inst. metall. im.