Hygroscopicity, phase transition and thermal expansion in Yb2-Ga W3O12 system
| Autor: | Leonardo Ewbank Vasconcellos, Bojan A. Marinkovic, Anja Dosen, Tamires Martinhão Machado, Isabella Loureiro Muller Costa, Gabriela Salgado Lima de Faro Melo |
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| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Materials science Mechanical Engineering Metals and Alloys Analytical chemistry Crystal system 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology medicine.disease 01 natural sciences Thermal expansion 0104 chemical sciences Crystal Mechanics of Materials Materials Chemistry medicine Molecule Dehydration 0210 nano-technology Luminescence Monoclinic crystal system |
| Zdroj: | Journal of Alloys and Compounds. 854:156643 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2020.156643 |
| Popis: | This study indicates that highly hygroscopic Yb2W3O12 adopts a monoclinic system at room temperature and atmospheric conditions, influenced by the presence of water molecules within the crystal framework. It seems that only after the complete dehydration at ∼100 °C, a monoclinic-to-orthorhombic transition occurs. The same water effect on the crystal system was observed in the Yb2-xGaxW3O12 series, ranging from 0.2 to 0.5. Yb3+ fluorescence emission band of Yb2-xGaxW3O12 is severely reduced in more hygroscopic phases. As the amount of Ga3+ increases in the Yb2-xGaxW3O12, coefficient of thermal expansion (CTE) becomes less negative, whereas the Yb3+ luminescence increases due to a less hygroscopic environment. |
| Databáze: | OpenAIRE |
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