Isothermal in situ reduction kinetics of CoCl2-SiO2 gels to Co-SiO2 nanocomposites

被引：7

作者：

Basumallick, A ^{[1
]}

Das, GC

Mukherjee, S

机构：

[1] Bengal Engn Coll, Dept Met, Howrah 711103, India

[2] Jadavpur Univ, Dept Met Engn, Calcutta 700032, W Bengal, India

来源：

THERMOCHIMICA ACTA | 1999年 / 325卷 / 02期

关键词：

nanocomposite; sol-gel; in situ; reduction; kinetics; mechanism;

D O I：

10.1016/S0040-6031(98)00565-6

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In situ reduction kinetics of CoCl2-SiO2 gel to Co-SiO2 nanocomposite in the 800-950 degrees C range has been studied. The presence of nanosized metallic Co in the host matrix has been established from the X-ray diffraction patterns of the reduced gels. The metallic panicle size has been found to be 17 and 23 nm when reduced at 850 degrees and 950 degrees C, respectively. Nucleation and growth type of mechanism remain operative during the course of the reduction. The activation energy is found to be in the range of 55-61 kJ/mol. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

引用

页码：167 / 170

页数：4

共 13 条

[1] Preparation of Co and Fe nanocomposites in SiO2 matrices [J].