Monoclinic La1-xBaxMnO3 (x = 0.185) at 160 K

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Rotiroti, Nicola ; Tamazyan, Rafael ; van Smaalen, Sander ; Mukovskii, Yakov:
Monoclinic La1-xBaxMnO3 (x = 0.185) at 160 K.
In: Acta Crystallographica Section C. Bd. 61 (2005) Heft 9 . - i83-i85.
ISSN 1600-5759
DOI: https://doi.org/10.1107/S0108270105017518

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Abstract

Single-crystal X-ray diffraction has shown that lanthanum barium manganese trioxide, La0.815Ba0.185MnO3, is monoclinic (I2/c) below a first-order phase transition at 187.1 (3) K. This result differs from the Pbnm symmetry usually assigned to colossal magnetoresistance oxides, A1−xA′xMnO3 with x ≃ 0.2, which adopt a distorted perovskite-type crystal structure. The Mn atom lies on an inversion center, the disordered Li/Ba site is on a twofold axis and one of the two independent O atoms also lies on a twofold axis.