Title :

New oxybromide cobaltites with layered perovskiterelated structures: 18R-Ba6Co5BrO14 and 14H-Ba7Co6BrO17

Author(s) :

Kauffmann, M. [Auteur]
Roussel, Pascal [Auteur]

Journal title :

Acta Crystallogr. Sect. B-Struct. Sci.

Abbreviated title :

Acta Crystallogr. Sect. B-Struct. Sci.

Pages :

589-596

Publication date :

2007-08

ISSN :

0108-7681

HAL domain(s) :

Chimie

English abstract : [en]

Single crystals of the title compounds were prepared by solid–solid reaction using BaBr2 flux at 1373 K. The structures of these two new cobaltites were solved and refined. The two compounds are built from a close-packing ...
Show more >Single crystals of the title compounds were prepared by solid–solid reaction using BaBr2 flux at 1373 K. The structures of these two new cobaltites were solved and refined. The two compounds are built from a close-packing of [BaO3] and [BaOBr] layers with stacking sequences (c′chhcc′)3 and (c′chhhcc′)2 for the 18R and 14H structures, respectively, which create Co3O12 trimers or Co4O15 tetramers of face-sharing octahedra connected at their extremities to isolated tetrahedra by corner-sharing. These new materials are strongly related to the 5H-Ba5Co5O14/12H-Ba0.9CoO2.6 and 10H-Ba5Co5ClO13/6H-Ba6Co6ClO16 materials, with the existence of common blocks. In Ba6Co5BrO14 and Ba7Co6BrO17, all the atoms in the vicinity of the [BaOBr] layers are disordered, whereas the rest of the structure is perfectly ordered.Show less >

Language :

Anglais

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 :

2023-05-30T18:18:54Z