New KRb 2 Sb 4 BO 13 and Rb 3 Sb 4 BO 13 compounds prepared by Rb + /K + ion exchange from the K 3 Sb 4 BO 13 ion conductor

The crystal structures of new K 3−x Rb x Sb 4 BO 13 compounds ( x = 2, 3), prepared via ion exchange from K 3 Sb 4 BO 13 , are reported. They adopt the triclinic crystal system and exhibit a localized Rb/K disorder at room temperature. The crystal structures were determined from single-crystal X-ray...

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Bibliographic Details
Published in:CrystEngComm 2019-01, Vol.21 (4), p.594-601
Main Authors: Doux, Jean-Marie, Stephant, Nicolas, La Salle, Annie Le Gal, Joubert, Olivier, Guyomard, Dominique, Quarez, Eric
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
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Summary:The crystal structures of new K 3−x Rb x Sb 4 BO 13 compounds ( x = 2, 3), prepared via ion exchange from K 3 Sb 4 BO 13 , are reported. They adopt the triclinic crystal system and exhibit a localized Rb/K disorder at room temperature. The crystal structures were determined from single-crystal X-ray diffraction at T = 25 °C for both end-members of the family, leading to a reinvestigation of the K 3 Sb 4 BO 13 crystal structure, and one intermediate composition KRb 2 Sb 4 BO 13 . The structure consists of hexagonal Sb 3 O 9 bronze-like layers alternately separated by edge-sharing Sb 2 O 10 dimers and BO 3 triangles, forming interconnected tunnels filled by Rb + /K + ions. The differences between the structures are based on the Rb/K disorder inside the tunnels conferring an advanced view of the cation diffusion paths. Additional information about conduction pathways was provided by the bond valence energy landscape (BVEL) method.
ISSN:1466-8033
1466-8033
DOI:10.1039/C8CE01712C