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Issue 46, 2005
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Synthesis and crystal structure of novel CaRMnSnO6 (R = La, Pr, Nd, Sm–Dy) double perovskites

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Abstract

The CaRMnSnO6 (R = La, Pr, Nd, Sm–Dy) double perovskites were prepared using a solid state reaction in evacuated sealed silica tubes at 1050–1100 °C. All compounds belong to the GdFeO3-type structure (orthorhombic a : b : c ≈ √2ap : 2ap : √2ap unit cell, space group Pnma, (a+bb) tilt system). The crystal structures were investigated by electron diffraction and high resolution electron microscopy and were refined from X-ray powder diffraction data for the R = La, Sm, Dy representatives (La: RI = 0.030, RP = 0.033; Sm: RI = 0.030, RP = 0.010; Dy: RI = 0.033, RP = 0.010). A disordered arrangement of the Ca and R cations over the A positions and Mn and Sn cations over the B positions was found in all cases. The small difference in charge and size between the Mn3+ and Sn4+ cations, the small degree of Jahn–Teller deformation of the MnO6 octahedra, and the ac-plane orbital ordering type were proposed as possible reasons for the cation disorder on the B sublattice. The compounds demonstrate a spin glass behavior in the temperature range from 25 to 300 K.

Graphical abstract: Synthesis and crystal structure of novel CaRMnSnO6 (R = La, Pr, Nd, Sm–Dy) double perovskites

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Publication details

The article was received on 19 Jul 2005, accepted on 13 Sep 2005 and first published on 17 Oct 2005


Article type: Paper
DOI: 10.1039/B510242A
Citation: J. Mater. Chem., 2005,15, 4899-4905
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    Synthesis and crystal structure of novel CaRMnSnO6 (R = La, Pr, Nd, Sm–Dy) double perovskites

    A. M. Abakumov, M. D. Rossell, S. A. Seryakov, M. G. Rozova, M. M. Markina, G. Van Tendeloo and E. V. Antipov, J. Mater. Chem., 2005, 15, 4899
    DOI: 10.1039/B510242A

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