Abstract
Via optimizing the experimental strategy, a series of Sr2Mn(1+x)W(1−x)O6 (x = 0,1/7, 1/5, 1/3, 4/11, 13/27 and 3/5) double perovskites were simply synthesized in either 1%H2/99%Ar or Ar streams. The x-ray diffraction patterns indicate that, with the increasing Mn-content (x), a gradual phase transition from monocline (P21/n) to tetragonal (I4/m) occurs. Comparative investigations, based on x-ray photoelectron spectroscopy and titrimetric analysis, confirm that the chemical states of the Mn cation are extremely sensitive to x values, and can present +2, +2/+3, +3 and +3/+4 chemical states in different compositions, but this is not the case for the W cation, which shows a stable +6 state in all compositions. The induced magnetic cations pairs Mn2+/Mn3+or Mn3+/Mn4+, along with the antiferromagnetic (AFM) order affect the magnetic behaviours significantly, giving rise to the change of dominant AFM interactions to considerable ferromagnetic (FM) interactions. Maybe our results not only provide an effective way for preparing Sr2MnWO6-based double perovskites, but also may be helpful for further development of Mn-based magnetic oxides.
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