纳米γ-Fe_2O_3的制备及特性研究  

A Study of Preparation and Properties of Nano-crystalline γ-Fe_2O_3 Powder

作　　者：李茂琼[1] 项金钟[1] 胡永茂[1] 方静华[1] 陈光学[1] 李建荣[1] 吴兴惠[1] 

机构地区：[1]云南大学材料科学与工程系,昆明650091

出　　处：《材料导报》2003年第3期83-84,71,共3页Materials Reports

基　　金：云南省自然科学基金(2001E0003Z)

摘　　要：用溶胶-凝胶法在一定条件下制备了纯的纳米级γ-Fe_2O_3,并研究了其热稳定性。XRD结果表明,γ-Fe_2O_3在500℃温度下烧结后仍为γ-Fe_2O_3相,随着烧结温度的升高,晶型逐渐由γ相转变为α相;当烧结温度达到900℃时,γ-Fe_2O_3基本上全部转化为α-Fe_2O_3。Nano-scale γ-Fe_2O_3 were prepared by using the Sol -Gel method in ferric nitrate and iron nitrate system. The samples were characterized by XRD,TGA-DTA and TEM. The thermal stability of the γ-Fe2O3 samples was investigated. The results show that the average diameter of particles is about 20nm and that the structure of nanocrystal γ-Fe2O3 has a good stability when kept at 500℃ for 1h. But at 600℃ for lh,the γ-Fe2O3 nanocrystalline will begin to partially transform to α-Fe2O3 structure. When held at 900℃ for 1h, the γ-Fe2O3 will almost entirely change into α-Fe2O3 phase state.

关 键 词：制备 溶胶-凝胶法 纳米Γ-FE2O3 氢氧化钠 三氧化二铁 磁性材料 

分 类 号：TM27[一般工业技术—材料科学与工程] TB383[电气工程—电工理论与新技术]