Abstract
AbstractThe complex metal oxides Mn2ASbO6 (A = In, Sc) with a corundum‐related structure A3BO6 were prepared as polycrystalline powders by a solid‐state reaction route. Their crystal structure and magnetic properties were investigated by using a combination of X‐ray and neutron powder diffraction, electron microscopy, calorimetric, and magnetic measurements. At room temperature, these compounds adopt a trigonal structure, space group R$\bar {3}$, with a = 8.9313(1) Å, c = 10.7071(2) Å (for In) and a = 8.8836(1) Å, c = 10.6168(2) Å (for Sc), which persists down to 1.6 K. The Mn and A cations were found to be randomly distributed over the A sites. The overall behavior of the magnetization of Mn2InSbO6 and that of Mn2ScSbO6 are quite similar. In spite of the relatively large amount of Mn ions on the A site, only short‐range magnetism is observed. Neutron diffraction patterns of Mn2InSbO6 showed no evidence of a long‐range magnetic ordering at 1.6 K, instead only a weak diffuse magnetic peak was observed at low temperatures. The factors governing the observed structural and magnetic properties of Mn2ASbO6 are discussed and compared with those of other Mn‐containing complex metal oxides with a corundum‐related structure. The influence of the A cation sublattice on the magnetic properties is also considered.
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