Low-Temperature Crystal Chemistry of Hingganite-(Y), from the Wanni Glacier, Switzerland
| Autor: | Dmitrii Pankin, Stéphane Cuchet, Vladimir V. Shilovskikh, Oleg S. Vereshchagin, Liudmila A. Gorelova |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
crystal structure
Materials science lcsh:QE351-399.2 010504 meteorology & atmospheric sciences Crystal chemistry Analytical chemistry Crystal structure 010502 geochemistry & geophysics 01 natural sciences gadolinite-group Thermal expansion symbols.namesake hingganite-(Y) Spectroscopy single crystal X-ray diffraction 0105 earth and related environmental sciences thermal expansion lcsh:Mineralogy low-temperature Geology Atmospheric temperature range Geotechnical Engineering and Engineering Geology Gadolinite Raman spectroscopy symbols Wanni glacier Monoclinic crystal system |
| Zdroj: | Minerals, Vol 10, Iss 322, p 322 (2020) Minerals Volume 10 Issue 4 |
| Popis: | Hingganite from the Wanni glacier (Switzerland) was studied by means of energy dispersive and wavelength-dispersive spectroscopy, Raman spectroscopy, and low-temperature single-crystal X-ray diffraction. According to its chemical composition, the investigated mineral should be considered as hingganite-(Y). It showed a relatively high content of Gd, Dy, and Er and had limited content of lighter rare-earth element (REE), which is typical for Alpine gadolinite group minerals. The most intense Raman bands were 116, 186, 268, 328, 423, 541, 584, 725, 923, 983, 3383, and 3541 cm&minus 1. Based on data of low-temperature [(&minus 173)&ndash (+7) ° C] in situ single-crystal X-ray diffraction, it was shown that the hingganite-(Y) crystal structure was stable in the studied temperature range and no phase transitions occurred. Hingganite-(Y) demonstrated low volumetric thermal expansion (&alpha V = 9(2) × 10&minus 6 ° C&minus 1) and had a high thermal expansion anisotropy up to compression along one of the directions in the layer plane. Such behavior is caused by the shear deformations of its monoclinic unit cell. |
| Databáze: | OpenAIRE |
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