Synthesis and Characterization of LaNi0.5 Ti0.5 O3 and La2 NiTiO6 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 .