title: Magnetic properties of double perovskite La2BMnO6 (B = Ni or Co) nanoparticles.
abstract: Double perovskite La2BMnO6 (B = Ni and Co) nanoparticles with average particle size of ~50 nm were synthesized using a facile, environmentally friendly, and scalable molten-salt reaction at 700 °C in air. Their structural and morphological properties were characterized by X-ray diffraction and transmission electron microscopy. Their magnetic properties were evaluated and compared using dc magnetic M-T and M-H, and ac magnetic susceptibility versus frequency, temperature, and field for the first time. The dc magnetization curves show paramagnetic-ferromagnetic transitions at TC∼ 275 and 220 K for La2NiMnO6 (LNMO) and La2CoMnO6 (LCMO) nanoparticles, respectively. ac susceptibility revealed that the LCMO nanoparticles had a single magnetic transition indicative of Co(2+)-O(2-)-Mn(4+) ordering, whereas the LNMO nanoparticles showed more complex magnetic behaviors suggesting a re-entrant spin glass.
authors.affiliation: Department of Chemistry, University of Texas-Pan American, Edinburg, TX 78539, USA. maoy@utpa.edu
authors.forename: Yuanbing
authors.initials: Y
authors.lastname: Mao
authors.forename: Jason
authors.initials: J
authors.lastname: Parsons
authors.forename: John S
authors.initials: JS
authors.lastname: McCloy