The application of high-temperature X-ray diffraction and infrared emission spectroscopy to the thermal decomposition of krohnkite.
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Date
2016
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Abstract
High-temperature X-ray diffraction and infrared
emission spectroscopy have been applied to measure the
thermal stability of the sulphate mineral kro¨hnkite
Na2Cu(SO4)2 2H2O. Kro¨hnkite shows a low thermal stability.
The mineral decomposes into a complex mixture of
sulphates below 500 C and sulphides below 650 C,
before melting. Broad emission infrared bands at 3350 and
3105 cm-1 are assigned to the stretching vibration of the
water units. The intensity of these two bands decreases as
the temperature is raised. The intensity of these bands is
lost by 250 C. The sharp IES band at 992 cm-1 is
assigned to the m1 SO4
2- symmetric stretching vibration.
Intensity in this band is lost by 200 C. New IES bands are
noted. The important aspect of this work is the use of hightemperature
X-ray diffraction to determine the thermal
decomposition of a mineral, in this case krohnkite.
Description
Keywords
Krohnkite, Infrared emission spectroscopy, Sulphate, Thermal stability
Citation
TESTASICCA, L. P. et al. The application of high-temperature X-ray diffraction and infrared emission spectroscopy to the thermal decomposition of krohnkite. Journal of Thermal Analysis and Calorimetry, v. 126, p. 1089-1095, 2016. Disponível em: <https://link.springer.com/article/10.1007/s10973-016-5644-y>. Acesso em: 25 ago. 2017.