In situ observation of the thermal decomposition of weddelite by heating stage environmental scanning electron microscopy

被引：0
|
作者：
Kloprogge, JT
Boström, TE
Weier, ML
机构：
[1] Queensland Univ Technol, Sch Phys & Chem Sci, Inorgan Mat Res Grp, Brisbane, Qld 4001, Australia
[2] Queensland Univ Technol, Analyt Electron Microscopy Facil, Brisbane, Qld 4001, Australia
来源：
AMERICAN MINERALOGIST | 2004年 / 89卷 / 01期
关键词：
D O I：
暂无
中图分类号：
P3 [地球物理学]; P59 [地球化学];
学科分类号：
0708 ; 070902 ;
摘要：
The morphological and chemical changes occurring during the thermal decomposition of weddelite, CaC2O4.2H(2)O, have been followed in real time in a heating stage attached to an Environmental Scanning Electron Microscope operating at a pressure of 2 Torr, with a heating rate of 10 degreesC/min and an equilibration time of approximately 10 min. The dehydration step around 120 degreesC and the loss of CO around 425 degreesC do not involve changes in morphology, but changes in the composition were observed. The final reaction of CaCO3 to CaO while evolving CO2 around 600 degreesC involved the formation of chains of very small oxide particles pseudomorphic to the original oxalate crystals. The change in chemical composition could only be observed after cooling the sample to 350 degreesC because of the effects of thermal radiation.
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页码：245 / 248
页数：4
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