Magnetic behavior and site occupancy in Fe-doped In2O3 nanoparticles

Alves Oliveira A.; Ivan Valerio-Cuadros M.; Soares de Brito A.; Felipe Silva Tupan L.; Barco R.; Francisco Ivashita F.; Paesano A., Jr. · Journal of Magnetism and Magnetic Materials (2022) · DOI: 10.1016/j.jmmm.2021.168944

Resumen

(In1-xFex)2O3 monophasic nanoparticles were prepared by a freeze-drying process followed by heat treatment after which they were characterized by magnetization measurements and Mössbauer spectroscopy at temperatures ranging from 300 to 4.2 K. The iron cations were trivalent and substituted for the indium cations in both cationic sites, 24d and 8b, of the oxide matrix, showing an occupancy preference that depends on x. Two different magnetic regimes were observed after varying the temperature of the doped samples, and both correlated with the iron magnetic moments. At room temperature, the moments at the site 24d were partially ordered with ferromagnetic alignment, whereas those at the site 8b showed paramagnetic behavior. After decreasing the temperature, both sublattices become progressively ordered and more robustly below 50 K.

Instituciones: Universidad Nacional Mayor de San Marcos