Electron doping effect on structural and magnetic phase transitions in Sr{sub 2-x}Nd{sub x}FeMoO{sub 6} double perovskites

Journal Article · Mon May 15 04:00:00 EDT 2006 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2006.01.043· OSTI ID:20784988

Azad, A K ^[1]; Eriksson, S -G ^[1]; Khan, Abdullah ^[2]; Eriksson, A ^[1]; Tseggai, M ^[3]

---

1. Department of Inorganic Chemistry, Goeteborg University, SE-41296 Goeteborg (Sweden)
2. Department of Chemistry, University of Balochistan, Quetta (Pakistan)
3. Department of Engineering Sciences, Uppsala University, SE-75121 Uppsala (Sweden)

Polycrystalline Sr{sub 2-x}Nd{sub x}FeMoO{sub 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 10-400K and converts to cubic symmetry above 450K. The unit cell volume increases with increasing Nd{sup 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{sup 3+} doping. The Curie temperature was increased from 430K for x=0 to 443K 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.

• OSTI ID: 20784988
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANTIFERROMAGNETISM
CITRATES
COPRECIPITATION
CRYSTAL DEFECTS
CURIE POINT
ELECTRONS
IRON COMPOUNDS
MAGNETIC MOMENTS
MAGNETIZATION
MOLYBDENUM COMPOUNDS
NEODYMIUM COMPOUNDS
NEODYMIUM IONS
NEUTRON DIFFRACTION
NUCLEAR STRUCTURE
OXIDES
PEROVSKITE
PHASE TRANSFORMATIONS
POLYCRYSTALS
STRONTIUM COMPOUNDS
TEMPERATURE DEPENDENCE