EFFECT OF HEAT-TREATMENT ON MICROSTRUCTURE EVOLUTION OF HEMATITE DERIVED FROM SYNTHETIC GOETHITE

被引：21

作者：

KRYUKOVA, GN

TSYBULYA, SV

SOLOVYEVA, LP

SADYKOV, VA

LITVAK, GS

ANDRIANOVA, MP

机构：

[1] Institute of Catalysis, Siberian Branch, the U.S.S.R. Academy of Sciences, Novosibirsk, 630090

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1991年 / 149卷 / 01期

关键词：

D O I：

10.1016/0921-5093(91)90793-M

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The evolution of the microstructure of alpha-Fe2O3 derived from synthetic alpha-FeOOH in a wide temperature range (400-1100-degrees-C) has been systematically investigated using X-ray powder diffractometry and transmission electron microscopy. It was found that during the dehydration of alpha-FeOOH at 400-degrees-C the alpha-Fe2O3 structure with a small amount of residual OH groups is formed. After heating at 500-degrees-C the specimen has been shown to possess a stoichiometric composition. Further heating to 900-degrees-C causes the gradual disappearance of the planar faults observed in low temperature specimens, followed by the formation of the (100) twins and surface steps enriched by potassium, chlorine and aluminium impurities.

引用

页码：121 / 127

页数：7

共 14 条

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[2] SHAPE EFFECTS ON CRYSTALLITE SIZE DISTRIBUTIONS IN SYNTHETIC HEMATITES FROM X-RAY LINE-PROFILE ANALYSIS [J].