Synthesis and Characterization of LaNi0.5Ti0.5O3 and La2NiTiO6 Double Perovskite Nanoparticles

In the present work, LaNi0.5Ti0.5O3 and La2NiTiO6 nanoparticles were synthesized by the modified Pechini method. LaNi0.5Ti0.5O3 was calcined at 1073 K for 17 h or 100 h, while La2NiTiO6 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, Neel temperature close to 15 K, and magnetic moment of 1.29 mu(B). 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, Neel temperature around 12 K, and magnetic moment of 0.96 mu(B). La2NiTiO6 presented a monoclinic crystal structure, with P2(1)/n space group, mean particle size of 80.0 +/- 5 nm, rock salt ordering of Ni2+ and Ti4+, Neel temperature of approximately 23 K, and magnetic moment of 2.75 mu(B).

Automated summary

In this work, LaNi0.5Ti0.5O3 and La2NiTiO6 nanoparticles were successfully synthesized using the modified Pechini method. By increasing the calcination time, the crystal structure of LaNi0.5Ti0.5O3 remained the same while the particle size increased and short-range ordering of Ni2+ and Ti4+ was observed. La2NiTiO6 exhibited a monoclinic structure with a larger particle size and rock salt ordering of Ni2+ and Ti4+.