The application of high-temperature X-ray diffraction and infrared emission spectroscopy to the thermal decomposition of kröhnkite
| Autor: | Jessica Lima, Leonardo Pena Testasicca, Fernanda Maria Belotti, Ricardo Scholz, Ray L. Frost, Xiuxiu Ruan |
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| Rok vydání: | 2016 |
| Předmět: |
Diffraction
Mineral Materials science Infrared Thermal decomposition Analytical chemistry Mineralogy 02 engineering and technology 010502 geochemistry & geophysics 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences X-ray crystallography Thermal stability Emission spectrum Physical and Theoretical Chemistry 0210 nano-technology Intensity (heat transfer) 0105 earth and related environmental sciences |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 126:1089-1095 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | High-temperature X-ray diffraction and infrared emission spectroscopy have been applied to measure the thermal stability of the sulphate mineral krohnkite Na2Cu(SO4)2·2H2O. Krohnkite 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 ν1 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 high-temperature X-ray diffraction to determine the thermal decomposition of a mineral, in this case krohnkite. |
| Databáze: | OpenAIRE |
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