Kinetic study of ZnFe2O4 formation from mechanochemically activated Zn-Fe2O3 mixtures

被引：23

作者：

Botta, PM

Aglietti, EF

López, JMP

机构：

[1] INTEMA, RA-7608 Mar Del Plata, Argentina

[2] CETMIC, RA-1897 Manuel B Gonnet, Argentina

来源：

MATERIALS RESEARCH BULLETIN | 2006年 / 41卷 / 04期

关键词：

ceramics; X-ray diffraction; diffusion;

D O I：

10.1016/j.materresbull.2005.10.011

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The kinetics of ZnFe2O4 formation starting from mechanochemically activated Zn-Fe2O3 powders are studied. Mixtures of metallic Zn and hematite were activated under air atmosphere in a high energy mill and thermally treated at temperatures between 500 and 650 degrees C during several holding times. During the activation, morphological and compositional changes were observed, but ZnFe2O4 formation was not detected. The ZnFe2O4 content in heated samples was determined using quantitative X-ray diffraction analysis. The resulting conversion-time curves were fitted using different kinetic models of solid-state reaction, calculating the kinetic parameters of the studied reaction. The comparison with the conventional synthesis method revealed that the mechanochemical treatment provoked a change of the rate-controlling step and a significant decrease of the activation energy, which was more evident for the more activated mixtures. (c) 2005 Elsevier Ltd. All rights reserved.

引用

页码：714 / 723

页数：10

共 25 条

[11] THE CHEMICAL-KINETICS OF MECHANICAL ALLOYING [J].