Thermal decomposition of ammonium jarosite (NH4)Fe3(SO4)2(OH)6

被引：72

作者：

Frost, RL ^{[1
]}

Wills, RA ^{[1
]}

Kloprogge, JT ^{[1
]}

Martens, W ^{[1
]}

机构：

[1] Queensland Univ Technol, Sch Phys & Chem Sci, Inorgan Mat Res Program, Brisbane, Qld 4001, Australia

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2006年 / 84卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

ammonium jarosite; dehydroxylation; infrared emission spectroscopy; thermogravimetric analysis;

D O I：

10.1007/s10973-005-6953-8

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Thermogravimetry combined with mass spectrometry has been used to study the thermal decomposition of a synthetic ammonium jarosite. Five mass loss steps are observed at 120, 260, 389, 510 and 541 degrees C. Mass spectrometry through evolved gases confirms these steps as loss of water, dehydroxylation, loss of ammonia and loss of sulphate in two steps. Changes in the molecular structure of the ammonium jarosite were followed by infrared emission spectroscopy (IES). This technique allows the infrared spectrum at the elevated temperatures to be obtained. IES confirms the dehydroxylation to have taken place by 300 degrees C and the ammonia loss by 450 degrees C. Loss of the sulphate is observed by changes in band position and intensity after 500 degrees C.

引用

页码：489 / 496

页数：8

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