Abstract: Flower-like magnesium hydroxide Mg(OH)₂ nanoparticles were synthesized via homogeneous precipita-tion method under microwave irradiation,using MgSO₄ and NH₃•H₂O-NH₄Cl buffer solution as reactants,then magnesiumoxide(MgO) nanoparticles could be obtained through calcination.Obtained Mg(OH)₂ nanoparticles and MgO nanoparticles were characterized separately in terms of conformation,morphology,and thermal stability by the means of XRD,TEM,SEM,TG and so on.Results showed that the Mg(OH)₂ nanoparticles had good crystallization behavior and their morphology was flower-like (formed by the aggregation of nano-films with about 40 nm in thickness);MgO nanoparticles also maintained the Mg(OH)₂′s special appearance.And the possible formation mechanism of nano-sized Mg(OH)₂ under the assistance of microwave-assisted was discussed.

Key words: magnesium hydroxide, magnesium oxide, microwave-assisted, homogeneous precipitation