Structures of incommensurate and commensurate composite crystals RbₓMnO₂(x = 1.3711, 1.3636)

Title data

Nuss, Jürgen ; Pfeiffer, Steffen ; van Smaalen, Sander ; Jansen, Martin:
Structures of incommensurate and commensurate composite crystals RbₓMnO₂(x = 1.3711, 1.3636).
In: Acta Crystallographica Section B. Vol. 66 (2010) Issue 1 . - pp. 27-33.
ISSN 2052-5206
DOI: https://doi.org/10.1107/S0108768109053312

Official URL:

Abstract in another language

Rb₁.₃₇₁₁MnO₂(Rb₁₁Mn₈O₁₆) has been synthesized via the azide/nitrate route from a stoichiometric mixture of the precursors Mn₂O₃, RbNO₃ and RbN₃. The structure of this extremely air- and moisture-sensitive compound can best be described in terms of an incommensurate composite structure, built up by a honeycomb-like framework of Rb ions, as one subsystem and by a second subsystem of chains, consisting of edge-sharing MnO₄/₂ tetrahedra. These two composite substructures interpenetrate in such a way that the manganate chain polyanions centre the channels of the Rb-honeycomb framework. Crystals transform by an aging process into Rb₁.₃₆₃₆MnO₂ (Rb₁₅Mn₁₁O₂₂), which has a similar structure but a different commensurate modulation. Two reasons can be established for the origin of the modulations: the charge ordering of Mn²⁺Mn³⁺ on one hand, and the incompatibility of the Mn—-Mn and Rb—-Rb separations on the other.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Keywords:	alkali metal manganate; composite crystal; incommensurate/commensurate modulated structures
Institutions of the University:	Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences > Chair Crystallography > Chair Crystallography - Univ.-Prof. Dr. Sander van Smaalen Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Group Material Sciences
Result of work at the UBT:	Yes
DDC Subjects:	500 Science > 530 Physics
Date Deposited:	07 Aug 2015 10:12
Last Modified:	20 Oct 2023 08:38
URI:	https://eref.uni-bayreuth.de/id/eprint/17612