NDLI: Thermogravimetric analysis of the copper silicate mineral dioptase Cu$_{6}$[Si$_{6}$O$_{18}$]·6H$

Content Provider	Springer Nature Link
Author	Frost, Ray L. Xi, Yunfei
Copyright Year	2012
Abstract	There have been a few studies on the thermal decomposition of dioptase Cu$_{6}$[Si$_{6}$O$_{18}$]·6H$_{2}$O. The results of these analyses are somewhat conflicting and the conclusions vary among these thermo-analytical studies. The objective of this research is to report the thermal analysis of dioptase from different origins and to show the mechanism of decomposition. Thermal decomposition occurs over a very wide temperature range from around 400 to 730 °C with the loss of water. Two additional mass loss steps are observed at around 793 and 835 °C with loss of oxygen. The infrared spectra of dioptase in the hydroxyl stretching region enables the hydrogen bond distances of water molecules in the dioptase structure to be calculated. The large variation in the hydrogen bond distances offers an explanation as to why the decomposition of dioptase with loss of water occurs over such a wide temperature range.
Starting Page	615
Ending Page	619
Page Count	5
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	112
Issue Number	2
e-ISSN	15728943
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dioptase Silicate minerals Thermogravimetric analysis Infrared spectroscopy Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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