KINETICS AND MECHANISM OF CORUNDUM FORMATION IN THE THERMAL-DECOMPOSITION OF BASIC ALUMINUM-CHLORIDE GELS

被引：5
|
作者：
BRAND, P
ZIEGENBALG, G
KOHNKE, K
机构：
[1] TU Bergakademie Freiberg, Institut für Anorganische Chemie, Freiberg
[2] Freiberg, D-09599
[3] TU Bergakademie Freiberg, Institut für Physikalische Chemie, Freiberg
来源：
CRYSTAL RESEARCH AND TECHNOLOGY | 1994年 / 29卷 / 02期
关键词：
D O I：
10.1002/crat.2170290205
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
Compositions and corundum contents in products, formed by thermal decomposition of a basic aluminium chloride gel at temperatures up to 600-degrees-C, were determined at variable temperatures and times of decomposition. For the kinetics of alpha-alumina crystallization a model is proposed, valid for diffusion-controlled two-dimensional growth. A mechanistic interpretation of these results and of those from previous examinations is based on the essential influence of the gel structure and of the atmosphere in thermal decomposition. As the rate-controlling step of corundum formation the transportation of HCl and H2O molecules is discussed.
引用
收藏
页码：179 / 186
页数：8
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