New hexagonal perovskite with Mn4+ and Mn5+ at distinct structural positions | Научно-инновационный портал СФУ

New hexagonal perovskite with Mn4+ and Mn5+ at distinct structural positions

Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций

Конференция: Electron Microscopy and Analysis Group Conference (EMAG); Manchester, ENGLAND; Manchester, ENGLAND

Год издания: 2015

Идентификатор DOI: 10.1088/1742-6596/644/1/012004

Ключевые слова: Crystal structure, Dyes, Electron microscopy, High resolution transmission electron microscopy, Lithium, Neutron diffraction, Perovskite, Positive ions, Scanning electron microscopy, Transmission electron microscopy, Hexagonal perovskite, Hexagonal unit cells, Microwave assisted, Quasi-one dimensional, Scanning transmission electron microscopy, Solid-state synthesis, Structural solutions, X-Ray and neutron diffraction, Manganese

Аннотация: A new hexagonal perovskite, Ba7Li1.75Mn3.5O15.75, has been synthesised using microwave-assisted solid-state synthesis. Its crystal structure has elements typical for the layered hexagonal perovskites and quasi-one-dimensional oxides, hence representing a new polytype. Structural solution based on simultaneous refinement of X-ray and neutron diffraction data shows that Ba7Li1.75Mn3.5O15.75 crystallizes in a hexagonal unit cell with parameters a = 5.66274(2) A and = 16.7467(1) A (V = 465.063(4) a(3)). Columns of faceshared octahedra occupied by Mn4+, Li+ cations and vacancies along the. axis are separated in the ab plane by barium atoms, so that every sixth layer, the coordination of Mn5+ and Li+ changes to tetrahedral. Separation of Mn4+ and Mn5+ cations in two distinct structural positions makes the structure unique. A scanning transmission electron microscopy study revealed the formation of a rhombohedrally centered supercell, which might be attributed to the ordering of manganese and lithium atoms among cationic sites.

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Издание

Журнал: ELECTRON MICROSCOPY AND ANALYSIS GROUP CONFERENCE (EMAG2015)

Выпуск журнала: Vol. 644

ISSN журнала: 17426588

Место издания: BRISTOL

Издатель: IOP PUBLISHING LTD

Авторы

  • Tarakina N.V. (Experimentelle Physik III,Physikalisches Institut and Wilhelm Conrad Rontgen - Research Centre for Complex Material Systems,Universitat Wurzburg)
  • Gould C. (Experimentelle Physik III,Physikalisches Institut and Wilhelm Conrad Rontgen - Research Centre for Complex Material Systems,Universitat Wurzburg)
  • Tyutyunnik A.P. (Institute of Solid State Chemistry,Ural Branch of the Russian Academy of Sciences)
  • Bazuev G.V. (Institute of Solid State Chemistry,Ural Branch of the Russian Academy of Sciences)
  • Berger I.F. (Institute of Solid State Chemistry,Ural Branch of the Russian Academy of Sciences)
  • Nikolaenko I.V. (Institute of Solid State Chemistry,Ural Branch of the Russian Academy of Sciences)
  • Vasiliev A.D. (Siberian Federal University)

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