A Thermal Study of the New Mineral Belomarinaite KNaSO4
| Autor: | Alexander Belousov, Rimma S. Bubnova, Lidiya P. Vergasova, O. Yu. Saprykina, A. P. Shablinskii, Marina Belousova, Stanislav K. Filatov |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Diffraction
Mineral Fissure Metals and Alloys Analytical chemistry 02 engineering and technology Trigonal crystal system 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology 01 natural sciences Thermal expansion 020303 mechanical engineering & transports Geophysics medicine.anatomical_structure 0203 mechanical engineering Phase (matter) Thermal medicine Anisotropy Geology 0105 earth and related environmental sciences |
| Zdroj: | Journal of Volcanology and Seismology. 15:51-57 |
| ISSN: | 1819-7108 0742-0463 |
| Popis: | For the first time, the thermal behavior of a new mineral belomarinaite KNaSO4 from volcanic exhalations (trigonal crystal system, Sp. gr. P3m1, a = 5.6072(3), c = 7.1781(4) A, V = 195.45(2) A3) was studied on a natural sublimate sample from the 2012–2013 Tolbachik Fissure Eruption and its synthetic analogue, a low temperature (LT) polymorph of (Sp. gr. P3m1) in the range 30–800°C (high-temperature X‑ray diffraction) and 30–1000°C (DSC and TG). The mineral is stable up to a temperature of 470 ± 5°C, at which it has a polymorphic transformation into a high-temperature (HT) hexagonal polymorphic modification (Sp. gr. P63/mmc), which is stable until melted at 840°C based on DSC. The thermal expansion of both modifications is sharply anisotropic, and in the case of the HT phase the parameter a has a U-shape dependence with a minimum at T = 620°C. The volumetric expansion of the αV HT phase is greater than that for the LT phase by factors of 2–2.5 on average. |
| Databáze: | OpenAIRE |
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