A systematic study of preparation, structural characterization of Ni-Fe hydrotalcites and magnetism of the materials obtained after calcination was reported. A series of Ni-Fe hydrotalcites with Ni/Fe molar ratios of 2, 3, 4 and 6 was synthesized by coprecipitation. XRD patterns show that a well-crystallized hydrotalcite can be obtained when the Ni/Fe molar ratio is 3 with a long aging time at high temperature. TG-DTA results show that the materials decompose in two stages and the thermal stability of Ni-Fe-LDH is the best when the Ni/Fe molar ratio is 3. The materials obtained by calcination at 900 ℃ exhibit magnetism.

Key words: NICKEL, IRON, HYDROTALCITE, PRECIPITATION, THERMAL DECOMPOSITION, MAGNETISM, FERRITE, XRD, MAGNETISM