Magnetic and dielectric properties of sol-gel derived nanoparticles of double perovskite Y2NiMnO6

Abstract

Nanoparticles of Y2NiMnO6 having diameters around 20 nm were synthesized by a sol-gel method. X-ray data were analysed by Rietveld method. This showed the crystals to have monoclinic structure. X-ray photoelectron spectroscopy studies showed a ratio of Mn3+/Mn4+ equal to 0.64 to be present in the nanocrystals. A small polaron hopping conduction model was found to satisfactorily explain the electrical resistivity behaviour of the samples. The latter exhibited ferromagnetic (FM) properties with a Curie temperature around 92 K. This behaviour was ascribed to a ferromagnetic superexchange interaction between Mn4+ and Ni2+ ions. Spin glass behaviour was ruled out on the basis of ac magnetic susceptibility data. The nanocrystals exhibited a peak in the dielectric constant at a temperature 535 K indicating a ferroelectric transition. This is consistent with the recent theoretical prediction made on the basis of density functional calculations.

Magnetic entropy change and critical exponents in double perovskite Y2NiMnO6

“…It also shows a giant dielectric effect at room temperature [18]. Electrical conduction has been described by polaron hopping mechanism [19]. In this communication, we identify substantial magnetocaloric characteristics in the multiferroic double perovskite Y 2 NiMnO 6 [17].…”

Effect of Preparation Conditions on Magnetic and Dielectric Properties of Y2MMnO6 (M = Co, Ni)

“…A number of studies indicate coexistence of ferroelectric and ferromagnetic properties in several of A 2 MM′O 6 type rare‐earth perovskites . The A 2 MM′O 6 type compositions with lighter rare‐earth ions form cation‐disordered lattices where the dielectric and magnetic properties depend significantly on the sample preparation conditions . Studies on La 2 NiMnO 6 composition show coexistence of monoclinic and rhombohedral phases, and their fraction depend strongly on the sample preparation temperature and atmosphere .…”

Dielectric characterization of multiferroic magnetoelectric double-perovskite Y(Ni0.5Mn0.5)O3 thin films

“…The YNMO perovskite has been synthesized and their ferromagnetic ordering reported 36,37 . Thin films of YNMO have been also obtained with discrepant structural and magnetic results [38][39][40][41] , and it has been discretely referred as a ferroelectric-ferromagnetic perovskite in some studies 42,43 , although, no direct experimental confirmation of its ferroelectric nature has been yet reported in the literature 44 .…”