Study of the Ge20Te80-xSex glassy structures by combining solid state NMR, vibrational spectroscopies and DFT modelling

C. Gonçalves (1) , R. Mereau (1) , Virginie Nazabal (2) , Catherine Boussard-Plédel (2) , Claire Roiland (2) , E. Furet (2) , M. Deschamps (3) , B. Bureau (2) , M. Dussauze (1)

1 ISM - Institut des Sciences Moléculaires
2 ISCR - Institut des Sciences Chimiques de Rennes
3 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation

The glassy ternary system Ge-Te-Se is currently receiving an increased attention due to its extended range of transmission in the infrared opening the way to various potential applications in photonics. In this study, a multi-techniques approach combining solid-state NMR, Raman and infrared spectroscopies and DFT calculations provides insight into the organization of the GeSe4-GeTe4 glassy network and allows to clarify a whole structural description of the glassy system. A particular attention is devoted to the presence of mixed GeTe8-xSex structural units and to the type of interconnections forming the glass networks. Such experimental/theoretical approach is provided both for the selenium and the tellurium rich part of the glassy system.

Domaines: Chimie

C. Gonçalves, R. Mereau, Virginie Nazabal, Catherine Boussard-Plédel, Claire Roiland, et al.. Study of the Ge20Te80-xSex glassy structures by combining solid state NMR, vibrational spectroscopies and DFT modelling. Journal of Solid State Chemistry, 2021, 297, pp.122062. ⟨10.1016/j.jssc.2021.122062⟩. ⟨hal-03196087⟩