【摘要】 粒径为２０—３０ｎｍ的α—Ｆｅ粒子由ＣＷＣＯ２激光气相热解Ｆｅ（ＣＯ）；方法制备．对α一Ｆｅ纳米粒子从室温到高温的氧化研究表明，在低于１５０℃条件下，氧化产物为Ｆｅ３Ｏ４；２００－３００℃则为γ—Ｆｅ２Ｏ３；高于４００℃，γ—Ｆｅ２Ｏ３转变为α—Ｆｅ２Ｏ３．高温氧化过程中无Ｆｅ３Ｏ４和ＦｅＯ（浮氏体）形成用ＴＥＭ和ＸＲＤ分析表明，α—Ｆｅ纳米粒子氧化产物γ一Ｆｅ２Ｏ３及α一Ｆｅ２Ｏ３仍为纳米微粒，而且具有实心和空心两种形态本文还探讨了氧化物的形成机制．更多还原

【Abstract】 An extensive study has been made of the oxidation of the α-Fe nano-particles nm)prepared by CW CO2 Laser-induced pyrolysis of Fe(CO),.It has been indicated that the surface oxide formed on the α-Fe nano-particles at room temperature in air is Fe3O4.The α -Fe particles was oxidised to γ-Fe2O3 at 200℃─300℃,and at above 400℃,the γ-Fe2O3 was transformed to α-Fe2O3 gradually.The α-Fe and its oxide particles was characterized by TEM and XRD.The oxide particles transformed from the α-Fe nano-particles was still the nano-par-ticles with a size larger than the α-Fe particles.Owing to the diffusion of iron ions and the canon vacancies,some γ-Fe2O3 and α-Fe2O3 nano-particles were porous.更多还原