MOSSBAUER-EFFECT STUDY OF THE BETA-FEOOH TO ALPHA-FE2O3 PHASE-TRANSFORMATION

被引：7

作者：

KNESE, K ^{[1
]}

WARTEWIG, P ^{[1
]}

MICHALK, C ^{[1
]}

FISCHER, S ^{[1
]}

机构：

[1] TECH UNIV DRESDEN,INST INORGAN CHEM,D-01069 DRESDEN,GERMANY

来源：

HYPERFINE INTERACTIONS | 1994年 / 94卷 / 1-4期

关键词：

D O I：

10.1007/BF02063730

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

beta-FeOOH was precipitated from a chloride solution. Mossbauer spectra were taken at room temperature (RT) and at 4.2 K in zero field and in external magnetic fields. Samples aged for successively longer time periods were studied. They contain alpha-FeOOH and alpha-Fe2O3, the Mossbauer spectra of which show superparamagnetic behavior. The transformation into alpha-Fe2O3 is already induced by aging in the mother solution at 100 degrees C. A final heat treatment at 350 degrees C leads to the complete transformation into alpha-Fe2O3 and to an increase of the crystallite size.

引用

页码：1999 / 2004

页数：6