Structural Transition and Magnetic Properties of (Sr2-3xLa2xBax)FeMoO6
Ordered double perovskite oxides (Sr2-3xLa2xBax)FeMoO6 (0≤x≤0.3) have been investigated in this work. X-ray powder diffraction reveals that the crystal structure of the compounds changes from a tetragonal I4/m lattice to a cubic Fm 3m lattice around x=0.2. Though the nominal average size of the A site cation of (Sr2-3xLa2xBax)FeMoO6 is designed to be almost independent of x, the refinements of the crystal structure show that the lattice constants increase with x in both the tetragonal and the cubic phase regions due to electron doping. As the x increases, the degree of cationic ordering on the B site is decreased pronouncedly, while the Curie temperature of the compounds is nearly unchanged.
Yuan Ming Huang
Z. F. Xu et al., "Structural Transition and Magnetic Properties of (Sr2-3xLa2xBax)FeMoO6", Materials Science Forum, Vols. 663-665, pp. 1036-1040, 2011