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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．
The α-Fe particles with particle size of 20-30nm were prepared by gas-phase pyrolysis of CWCO2 laser. The oxidation of α-Fe nanoparticles from room temperature to high temperature showed that the oxidation products were Fe3O4 at temperatures below 150 ℃ and γ-Fe2O3 at 200-300 ℃. When the temperature was above 400 ℃, the conversion of γ-Fe2O3 to α- Fe2O3. The formation of Fe3O4 and FeO (high temperature oxidation process) TEM and XRD analysis showed that the α-Fe nano-particles oxidation products γ-Fe2O3 and α-Fe2O3 nanoparticles are still nano, and has two kinds of solid and hollow The formation mechanism of oxide is discussed.