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Synthesis and Characterization of LaNi<inf>0.5</inf> Ti<inf>0.5</inf> O<inf>3</inf> and La<inf>2</inf> NiTiO<inf>6</inf> Double Perovskite Nanoparticles

Abstract:

In the present work, LaNi0.5 Ti0.5 O3 and La2 NiTiO6 nanoparticles were synthesized by the modified Pechini method. LaNi0.5 Ti0.5 O3 was calcined at 1073 K for 17 h or 100 h, while La2 NiTiO6 was calcined at 1273 K for 135 h. The double perovskite calcined at 1073 K for 17 h presented orthorhombic symmetry with Pbnm space group, mean particle size was 31.9 ± 1 nm, random ordering of Ni2+ and Ti4+ cations, Néel temperature close to 15 K, and magnetic moment of 1.29 µB. By increasing the calcination time, this material showed the same symmetry and space group, a mean particle size of 50.7 ± 2 nm, short-range ordering of Ni2+ and Ti4+ cations, Néel temperature around 12 K, and magnetic moment of 0.96 µB. La2 NiTiO6 presented a monoclinic crystal structure, with P21 /n space group, mean particle size of 80.0 ± 5 nm, rock salt ordering of Ni2+ and Ti4+, Néel temperature of approximately 23 K, and magnetic moment of 2.75 µB .