纳米α—Fe粒子的氧化研究  

INVESTIGATION ON OXIDATION OF α-Fe NANO-PARTICLES

作　　者：赵新清[1] 梁勇[1] 崔振江 郑丰[1] 肖克沈[1] 胡壮麒[1] 

机构地区：[1]中国科学院金属研究所快速凝固与非平衡合金国家实验室

出　　处：《腐蚀科学与防护技术》1995年第1期66-70,共5页Corrosion Science and Protection Technology

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．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.

关 键 词：α-Fe粒子 氧化 γ-Fe_(2)O_(3) Fe_(3)O_(4) 

分 类 号：O614.811[理学—无机化学]