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首页> 外文期刊>Journal of thermal analysis and calorimetry >Thermogravimetric analysis of the copper silicate mineral dioptase Cu _6Si_6O_(18)·6H_2O
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Thermogravimetric analysis of the copper silicate mineral dioptase Cu _6Si_6O_(18)·6H_2O

机译：Thermogravimetric analysis of the copper silicate mineral dioptase Cu _6Si_6O_(18)·6H_2O

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摘要

There have been a few studies on the thermal decomposition of dioptase Cu_6Si_6O_(18)·6H_2O. 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.

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