Influence of aging in an alkaline medium on the microstructural properties of α-FeOOH

被引：73

作者：

Krehula, S. ^{[1
]}

Music, S. ^{[1
]}

机构：

[1] Rudjer Boskovic Inst, Div Mat Chem, HR-10002 Zagreb, Croatia

来源：

JOURNAL OF CRYSTAL GROWTH | 2008年 / 310卷 / 02期

关键词：

crystal morphology; hydrothermal crystal growth; goethite;

D O I：

10.1016/j.jcrysgro.2007.10.072

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The influence of the aging in a highly alkaline medium at 160 degrees C on the microstructural properties of alpha-FeOOH was monitored by XRD, Fe-57 Mossbauer and FT-IR spectroscopies and FE-SEM. In the synthesis of acicular and monodisperse alpha-FeOOH particles, tetramethylammonium hydroxide was used as a precipitating agent. The crystal growth of alpha-FeOOH by the mechanism of lateral arraying was observed with prolonged aging time. Smaller alpha-FeOOH particles were dissolving with time, thus providing Fe(OH) ions for the additional growth of alpha-FeOOH particles and improvement of their crystal shape. The XRD analysis confirmed that the growth of alpha-FeOOH crystallites perpendicularly to the crystallographic c-axis was favoured. The Mossbauer spectrum of alpha-FeOOH showed a distribution of the hyperfine magnetic field (HMF) which gradually narrowed with a longer aging time. The average value of the HMF distribution was shifted from 35.3 to 37.1 T between 2 and 168 h of aging. Characteristic IR bands of alpha-FeOOH were sensitive to the microstructural changes of alpha-FeOOH particles during their aging in the suspension in a highly alkaline medium at 160 degrees C. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：513 / 520

页数：8

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