Effects of Cr doping on magnetic properties of ordered Sr2FeMoO6

The single-phase Cr-doped Sr2Fe1-xCrxMoO6 (x=0.00, 0.03, 0.07, 0.1) powder have been prepared by a solid-state reaction method. The crystalline structure of all the Cr-doped samples was tetragonal (I4/mmm) at room temperature, but the crystal symmetry changes into cubic (Fm-3m) above the Curie temperature. As the Cr-doping range increases, the saturation magnetization decreases and the coercivity force increase. Moessbauer spectra are shown the line broadening and 1, 6 and 3, 4 linewidth difference due to the anisotropic hyperfine field fluctuation