Thermal behavior and physicochemical studies of phase transitions before the decomposition in the Selenate Tellurate protonic conductor material
Thermal analysis confirmed the presence of the phase transition at T= 320K in the Cs2SeO4.H6TeO6 (CsSeTe) material. The structural study carried out at T=360K shows that this compound passes from the monoclinic system with the space group P2_1/c at room temperature, to the trigonal system with the s...
| Autores: | , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2020 |
| País: | España |
| Recursos: | Universidad de Oviedo (UNIOVI) |
| Repositório: | RUO. Repositorio Institucional de la Universidad de Oviedo |
| Idioma: | inglês |
| OAI Identifier: | oai:digibuo.uniovi.es:10651/57741 |
| Acesso em linha: | http://hdl.handle.net/10651/57741 https://dx.doi.org/10.1007/s10973-020-09817-2 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Differential Scanning Calorimetry (DSC) Crystal structure IR Raman Conductivity |
| Resumo: | Thermal analysis confirmed the presence of the phase transition at T= 320K in the Cs2SeO4.H6TeO6 (CsSeTe) material. The structural study carried out at T=360K shows that this compound passes from the monoclinic system with the space group P2_1/c at room temperature, to the trigonal system with the space group R3 ̅m. At room temperature, the anionic groups are well ordered and stable, whereas after the transition at T=320K, the selenate groups change their orientation and the tellurate polyhedra change their positions. The high temperature vibrational studies, carried out in a temperature range of 289 to 353 K, confirm the presence and nature of the transition detected by thermal analysis. The conductivity evolution versus temperature shows the presence of an ionic- protonic conduction phase transition at T=490K. |
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