Pure and RE3+-Doped La7O6(VO4)3 (RE = Eu, ...
Type de document :
Article dans une revue scientifique: Article original
PMID :
URL permanente :
Titre :
Pure and RE3+-Doped La7O6(VO4)3 (RE = Eu, Sm): Polymorphism Stability and Luminescence Properties of a New Oxyvanadate Matrix
Auteur(s) :
Gomez Torres, Maria Alejandra [Auteur]
Gauthier, Gilles H. [Auteur]
Kaczmarek, Anna M. [Auteur]
Huvé, Marielle [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Roussel, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Dupray, Valerie [Auteur]
Yuan, Lina [Auteur]
Zadoya, Anastasiya [Auteur]
Colmont, Marie [Auteur]
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Gauthier, Gilles H. [Auteur]
Kaczmarek, Anna M. [Auteur]
Huvé, Marielle [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Roussel, Pascal [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Dupray, Valerie [Auteur]
Yuan, Lina [Auteur]
Zadoya, Anastasiya [Auteur]
Colmont, Marie [Auteur]
![refId](/themes/Mirage2//images/idref.png)
Unité de Catalyse et Chimie du Solide (UCCS) - UMR 8181
Titre de la revue :
INORGANIC CHEMISTRY
Nom court de la revue :
Inorg Chem
Date de publication :
2020-04-14
ISSN :
1520-510X
Discipline(s) HAL :
Chimie/Chimie inorganique
Résumé en anglais : [en]
Two polytypes of the new oxyvanadate matrix La7O6(VO4)3 were identified and deeply characterized. The crystal structure of the α-polytype was solved using a combination of precession electron diffraction and powder X-ray ...
Lire la suite >Two polytypes of the new oxyvanadate matrix La7O6(VO4)3 were identified and deeply characterized. The crystal structure of the α-polytype was solved using a combination of precession electron diffraction and powder X-ray diffraction (XRD) techniques. It crystallizes in a monoclinic unit cell with space group P21, a = 13.0148(3) Å, b = 19.1566(5) Å, c = 7.0764(17) Å, and β = 99.87(1)°. Its structure is built upon [La7O6]9+ polycationic units at the origin of a porous 3D network, evidencing rectangular channels filled by isolated VO4 tetrahedra. An in situ high-temperature XRD study highlights a number of complex phase transitions assorted with the existence of a β-polytype also refined in a monoclinic unit cell, space group P21/n, a = 13.0713(4) Å, b = 18.1835(6) Å, c = 7.1382(2) Å, and β = 97.31(1)°. Thus, during the transitions, while the polycationic networks are almost identical, the vanadate's geometry is largely modified. The use of Eu3+ and Sm3+ at different concentrations in the host lattice is possible using solid-state techniques. The photoluminescence (PL), PL excitation (PLE) spectra, and luminescence decay times were recorded and discussed. The phosphors present an emission light, being bright and reddish orange after excitation under UV. This is mainly due to the V-O band and f-f transitions. Whatever the studied polytype, the final luminescence properties are retained during the heating/cooling process.Lire moins >
Lire la suite >Two polytypes of the new oxyvanadate matrix La7O6(VO4)3 were identified and deeply characterized. The crystal structure of the α-polytype was solved using a combination of precession electron diffraction and powder X-ray diffraction (XRD) techniques. It crystallizes in a monoclinic unit cell with space group P21, a = 13.0148(3) Å, b = 19.1566(5) Å, c = 7.0764(17) Å, and β = 99.87(1)°. Its structure is built upon [La7O6]9+ polycationic units at the origin of a porous 3D network, evidencing rectangular channels filled by isolated VO4 tetrahedra. An in situ high-temperature XRD study highlights a number of complex phase transitions assorted with the existence of a β-polytype also refined in a monoclinic unit cell, space group P21/n, a = 13.0713(4) Å, b = 18.1835(6) Å, c = 7.1382(2) Å, and β = 97.31(1)°. Thus, during the transitions, while the polycationic networks are almost identical, the vanadate's geometry is largely modified. The use of Eu3+ and Sm3+ at different concentrations in the host lattice is possible using solid-state techniques. The photoluminescence (PL), PL excitation (PLE) spectra, and luminescence decay times were recorded and discussed. The phosphors present an emission light, being bright and reddish orange after excitation under UV. This is mainly due to the V-O band and f-f transitions. Whatever the studied polytype, the final luminescence properties are retained during the heating/cooling process.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Collections :
Équipe(s) de recherche :
Matériaux inorganiques, structures, systèmes et propriétés (MISSP)
Date de dépôt :
2022-03-02T07:13:08Z
2023-02-07T10:44:21Z
2023-02-07T10:44:21Z