Hematite powders synthesized by mechanochemical processing

被引：25
|
作者：
Ding, J
Tsuzuki, T
McCormick, PG
机构：
[1] Spec. Res. Ctr. Adv. Mineral Mat. P., University of Western Australia, Perth
来源：
NANOSTRUCTURED MATERIALS | 1997年 / 8卷 / 06期
关键词：
D O I：
10.1016/S0965-9773(97)00221-3
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The mechanochemical synthesis of ultrafine hematite powders via solid-state reactions involving FeCl3 and CaO or Ca(OH)(2), respectively, has been investigated. Mechanical milling of 2FeCl(3)+3CaO led to a nanocrystalline mixture of these two compounds. Fe2O3 formed only after heat treatment at 150 degrees C or above. A dilution of CaCl2 into the starting mixture caused a significant decrease in particle size, resulting in 10-30 nm mono-disperse particles of Fe2O3. Nanocrystalline akaganeite, FeOON, together with calcium chloride was formed by milling 2FeCl(3)+3Ca(OH)(2). Conversion of FeOOH to Fe2O3 by dehydration occurred during subsequent heat treatment. Ultrafine Fe2O3 particles of 20-50 nm were obtained after removal of the CaCl2 by-product phase. (C) 1997 Acta Metallurgica Inc.
引用
收藏
页码：739 / 747
页数：9
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