[SrF0.8(OH)0.2]2.526[Mn6O 12]: Columnar rock-salt fragments inside the todorokite-type tunnel structure

Artem M. Abakumov, Joke Hadermann, Gustaaf Van Tendeloo, Maksim L. Kovba, Yuri Ya Skolis, Svetlana N. Mudretsova, Evgeny V. Antipov, Olga S. Volkova, Aleksandr N. Vasiliev, Natalia Tristan, Rüdiger Klingeler, Bernd Büchner

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10 Citations (Scopus)

Abstract

A new type of composite structure is described consisting of the todorokite-type [Mn6O12] framework with large square tunnels accommodating columnar fragments of the rock-salt structure. The crystal structure of the new todorokite-type [SrF0.8(OH)0.2] 2.526[Mn6O12] compound is solved from transmission electron microscopy, and the structure of its anhydrous form [SrF0.8O0.1]2.526[Mn6O 12] is refined from X-ray powder diffraction data. The [Mn 6O12] framework consists of mutually perpendicular walls built of three edge-sharing rutile-type strings of MnO6 octahedra delimiting large square tunnels with the size of 3 × 3 octahedra. The interior space in the tunnels is filled with rock-salt type [Sr(F,OH)] 4 columns. The structure can be interpreted as being an incommensurate composite structure with the modulation vector q1 = γc1* (γ = 0.63157(3)) parallel to the direction of tunnel propagation. The octahedral tunnel walls compose subsystem I with a [Mn6O12] composition and a periodicity c1 = 2.84 Å, whereas the [Sr(F,OH)]4 columns belong to subsystem II with a periodicity c1/γ = 4.49 Å, resulting in a [Sr(F,-OH)][Mn6O12] composition. [SrF0.8(OH)0.2]2.526[Mn6O 12] demonstrates a much larger number of cations inside the tunnels in comparison with the known synthetic and natural marine todorokites. The [SrF0.8-(OH)0.2]2.526[Mn6O 12] compound shows a spin-glass behavior below T* ≈ 26 K with a dominant antiferromagnetic correlation.

Original languageEnglish
Pages (from-to)1181-1189
Number of pages9
JournalChemistry of Materials
Volume19
Issue number5
DOIs
Publication statusPublished - 6 Mar 2007
Externally publishedYes

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