Electron doping effect on structural and magnetic phase transitions in Sr2−xNdxFeMoO6 double perovskites

✍ Scribed by A.K. Azad; S.-G. Eriksson; Abdullah Khan; A. Eriksson; M. Tseggai

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 594 KB
• Volume: 179
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1016/j.jssc.2006.01.043

✦ Synopsis

Polycrystalline Sr 2Àx Nd x FeMoO 6 (x ¼ 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 ¼ 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 ¼ 0 to 443 K for x ¼ 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.