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New KRb2Sb4BO13 and Rb3Sb4BO13 compounds prepared by Rb+/K+ ion exchange from K3Sb4BO13 ion conductor.

Abstract

The crystal structures of new K3-xRbxSb4BO13 compounds (x = 2, 3), prepared via ion exchange from K3Sb4BO13 are reported. They adopt the triclinic crystal system and exhibit a localized Rb/K disorder at room temperature. 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 K3Sb4BO13 crystal structure, and one intermediate composition KRb2Sb4BO13. The structure consists of hexagonal Sb3O9 bronze-like layers alternatively separated by edge-sharing Sb2O10 dimers and BO3 triangles, forming interconnected tunnels filled by the 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 Bond Valence Energy Landscape (BVEL) method.

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Publication details

The article was received on 08 Oct 2018, accepted on 28 Nov 2018 and first published on 29 Nov 2018


Article type: Paper
DOI: 10.1039/C8CE01712C
Citation: CrystEngComm, 2018, Accepted Manuscript
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    New KRb2Sb4BO13 and Rb3Sb4BO13 compounds prepared by Rb+/K+ ion exchange from K3Sb4BO13 ion conductor.

    J. Doux, N. Stephant, A. L. G. La Salle, O. Joubert, D. Guyomard and E. Quarez, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE01712C

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