Synthesis and crystal structure of the Sr2Al1.07Mn0.93O5 brownmillerite

Joke Hadermann, Artem M. Abakumov, Hans D’Hondt, Anna S. Kalyuzhnaya, Marina G. Rozova, Maria M. Markina, Mikhail G. Mikheev, Natalia Tristan, Rüdiger Klingeler, Bernd Büchner, Evgeny V. Antipov

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36 Citations (Scopus)

Abstract

A new brownmillerite-type compound Sr2Al1.07Mn0.93O5 was synthesized. The crystal structure was determined using electron diffraction and high resolution transmission electron microscopy and refined from X-ray powder diffraction data (space group Imma, a = 5.4358(1) Å, b = 15.6230(4) Å, c = 5.6075(1) Å, RI = 0.036, RP = 0.023). The structure is characterized by a disordered distribution of the tetrahedral chains in L and R configuration and a partial occupation of the octahedral position by the Mn3+ and Al3+ cations. The relationships between the crystal structures of Sr2Al1.07Mn0.93O5 and its A2B′MnO5 analogues (A = Ca, Sr, B′ = Al, Ga) and the structural reasons for the different types of tetrahedral chain ordering in brownmillerites are discussed. The temperature dependences of the magnetic susceptibility and specific heat reveal that the compound is antiferromagnetically ordered below TN = 105 K.

Original languageEnglish
Pages (from-to)692-698
Number of pages7
JournalJournal of Materials Chemistry
Volume17
Issue number7
DOIs
Publication statusPublished - 8 Feb 2007
Externally publishedYes

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