Abstract
Polycrystalline Sr 2− x Nd x FeMoO 6 ( x = 0.0 , 0.1, 0.2, 0.4) materials have been synthesized by a citrate co-precipitation method and studied by neutron powder diffraction (NPD) and magnetization measurements. Rietveld analysis of the temperature-dependent NPD data shows that the compounds ( x = 0.0 , 0.1, 0.2) crystallize in the tetragonal symmetry in the range 10–400 K and converts to cubic symmetry above 450 K. The unit cell volume increases with increasing Nd 3+ concentration, which is an electronic effect in order to change the valence state of the B-site cations. Antisite defects at the Fe–Mo sublattice increases with the Nd 3+ doping. The Curie temperature was increased from 430 K for x = 0 to 443 K for x = 0.4 . The magnetic moment of the Fe-site decreases while the Mo-site moment increases with electron doping. The antiferromagnetic arrangement causes the system to show a net ferrimagnetic moment.
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