Title :

Versatile Interplay of Chalcogenide and Dichalcogenide Anions in the Thiovanadate Ba ₇S(VS ₃O) ₂(S ₂) ₃ and Its Selenide Derivatives: Elaboration and DFT Meta-GGA Study.

Author(s) :

ALMOUSSAWI, Batoul [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Kageyama, H. [Auteur]
Kyoto University
Roussel, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Kabbour, Houria [Auteur correspondant]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]

Journal title :

ACS Org Inorg Au

Volume number :

3

Pages :

158-170

Publication date :

2023-06-18

ISSN :

2694-247X

English keyword(s) :

oxychalcogenides
dichalcogenidepairs
band-gapengineering
DFT
thiovanadates

HAL domain(s) :

Chimie/Chimie inorganique

English abstract : [en]

Oxychalcogenides are emerging as promising alternative candidates for a variety of applications including for energy. Only few phases among them show the presence of Q–Q bonds (Q = chalcogenide anion) while they drastically ...
Show more >Oxychalcogenides are emerging as promising alternative candidates for a variety of applications including for energy. Only few phases among them show the presence of Q–Q bonds (Q = chalcogenide anion) while they drastically alter the electronic structure and allow further structural flexibility. Four original oxy(poly)chalcogenide compounds in the system Ba–V–Q–O (Q = S, Se) were synthesized, characterized, and studied using density functional theory (DFT). The new structure type found for Ba7V2O2S13, which can be written as Ba7S(VS3O)2(S2)3, was substituted to yield three selenide derivatives Ba7V2O2S9.304Se3.696, Ba7V2O2S7.15Se5.85, and Ba7V2O2S6.85Se6.15. They represent original multiple-anion lattices and first members in the system Ba–V–Se–S–O. They exhibit in the first layer heteroleptic tetrahedra V5+S3O and isolated Q2– anions and in the second layer dichalcogenide pairs (Q2)2– with Q = S or Se. Selenide derivatives were attempted by targeting the selective substitution of isolated Q2– or (Q2)2– (in distinct layers) or both by selenide, but it systematically led to concomitant and partial substitution of both sites. A DFT meta-GGA study showed that selective substitution yields local constraints due to rigid VO3S and pairs. Experimentally, incorporation of selenide in both layers avoids geometrical mismatch and constraints. In such systems, we show that the interplay between the O/S anionic ratio around V5+, together with the presence/nature of the dichalcogenides (Q2)2– and isolated Q2–, impacts in unique manners the band gap and provides a rich background to tune the band gap and the symmetry.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS
Centrale Lille
ENSCL
Univ. Artois

Collections :

• Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181

Research team(s) :

Matériaux inorganiques, structures, systèmes et propriétés (MISSP)

Submission date :

2023-07-05T12:23:19Z
2023-10-20T08:07:31Z