Issue 7, 2007

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
29 Sep 2006
Accepted
16 Nov 2006
First published
04 Dec 2006

J. Mater. Chem., 2007,17, 692-698

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

J. Hadermann, A. M. Abakumov, H. D'Hondt, A. S. Kalyuzhnaya, M. G. Rozova, M. M. Markina, M. G. Mikheev, N. Tristan, R. Klingeler, B. Büchner and E. V. Antipov, J. Mater. Chem., 2007, 17, 692 DOI: 10.1039/B614168D

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