info:eu-repo/semantics/article
Synthesis, structure and magnetic properties of La 3Co 2SbO 9: A double perovskite with competing antiferromagnetic and ferromagnetic interactions
Fecha
2012-10Registro en:
Franco, Diego Gaspar; Fuertes, Valeria Cintia; Blanco, Marìa Cecilia; Fernández Díaz, M. T.; Sanchez, Rodolfo Daniel; et al.; Synthesis, structure and magnetic properties of La 3Co 2SbO 9: A double perovskite with competing antiferromagnetic and ferromagnetic interactions; Academic Press Inc Elsevier Science; Journal of Solid State Chemistry; 194; 10-2012; 385-391
0022-4596
CONICET Digital
CONICET
Autor
Franco, Diego Gaspar
Fuertes, Valeria Cintia
Blanco, Marìa Cecilia
Fernández Díaz, M. T.
Sanchez, Rodolfo Daniel
Carbonio, Raul Ernesto
Resumen
The synthesis, structural characterization, and magnetic properties of La 3Co 2SbO 9 double perovskite are reported. The crystal structure has been refined by X-ray and neutron powder diffraction data in the monoclinic space group P2 1/n. Co 2 and Sb 5 have the maximum order allowed for the La 3Co 2SbO 9 stoichiometry. Rietveld refinements of powder neutron diffraction data show that at room temperature the cell parameters are a=5.6274(2) Å, b=5.6842(2) Å, c=7.9748(2) Å and β=89.999(3)°. Magnetization measurements indicate the presence of ferromagnetic correlations with T C=55 K attributed to the exchange interactions for non-linear Co 2-O-Sb 5-O-Co 2 paths. The effective magnetic moment obtained experimentally is μ exp=4.38 μ B (per mol Co 2), between the theoretical one for spin only (3.87 μ B) and spin-orbit value (6.63 μ B), indicating partially unquenched contribution. The low magnetization value at high magnetic field and low temperature (1 μ B/f.u., 5 T and 5 K) and the difference between ZFC and FC magnetization curves (at 5 kOe) indicate that the ferromagnetism do not reach a long range order and that the material has an important magnetic frustration.