Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/236814
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Structural, vibrational and electronic properties of α′-Ga2S3 under compression |
Autor: | Gallego-Parra, S.; Vilaplana, R.; Gomis, Óscar; Lora da Silva, E.; Otero-de-la-Roza, Alberto; Rodríguez-Hernández, P.; Muñoz, A. CSIC; González, J.; Sans, Juan Ángel; Cuenca-Gotor, V. P.; Ibáñez Insa, Jordi CSIC ORCID ; Popescu, C.; Manjón, F. J. | Palabras clave: | Topology Van der Waals forces Structural properties Sulfur Gallium compounds Raman scattering Electrons Energy gap Anisotropy Electronic properties |
Fecha de publicación: | mar-2021 | Editor: | Royal Society of Chemistry (UK) | Citación: | Physical Chemistry Chemical Physics, 23: 6841–6862 (2021) | Resumen: | We report a joint experimental and theoretical study of the low-pressure phase of α′-Ga2S3 under compression. Theoretical ab initio calculations have been compared to X-ray diffraction and Raman scattering measurements under high pressure carried out up to 17.5 and 16.1 GPa, respectively. In addition, we report Raman scattering measurements of α′-Ga2S3 at high temperature that have allowed us to study its anharmonic properties. To understand better the compression of this compound, we have evaluated the topological properties of the electron density, the electron localization function, and the electronic properties as a function of pressure. As a result, we shed light on the role of the Ga–S bonds, the van der Waals interactions inside the channels of the crystalline structure, and the single and double lone electron pairs of the sulphur atoms in the anisotropic compression of α′-Ga2S3. We found that the structural channels are responsible for the anisotropic properties of α′-Ga2S3 and the A′(6) phonon, known as the breathing mode and associated with these channels, exhibits the highest anharmonic behaviour. Finally, we report calculations of the electronic band structure of α′-Ga2S3 at different pressures and find a nonlinear pressure behaviour of the direct band gap and a pressure-induced direct-to-indirect band gap crossover that is similar to the behaviour previously reported in other ordered-vacancy compounds, including β-Ga2Se3. The importance of the single and, more specially, the double lone electron pairs of sulphur in the pressure dependence of the topmost valence band of α′-Ga2S3 is stressed. | Versión del editor: | https://doi.org/10.1039/D0CP06417C | URI: | http://hdl.handle.net/10261/236814 | DOI: | 10.1039/D0CP06417C | ISSN: | 1463-9076 | E-ISSN: | 1463-9084 |
Aparece en las colecciones: | (Geo3Bcn) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
accesoRestringido.pdf | 14,71 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
WEB OF SCIENCETM
Citations
8
checked on 29-feb-2024
Page view(s)
95
checked on 28-abr-2024
Download(s)
11
checked on 28-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
Este item está licenciado bajo una Licencia Creative Commons