Magnetocapacitance effect in ferromagnetic LiNbO3 nanoparticles

Abstract Magnetocapacitance and magnetization behavior as a function of reduction heat treatment at 650 °C and 900 °C in a 5%H 2 –Ar atmosphere on LiNbO 3 nanocrystalline are reported. There is a change of intrinsic dielectric constant ( κ ) from 822 to 860 produced by spin polarization using an external magnetic field. The Raman, X-ray photoelectron spectroscopy and electron paramagnetic resonance spectroscopy, indicate vibration mode changes localized at Nb–O bonds in the octahedron NbO 6 , shifts in the binding energy of the electronic structure of ions of niobium (3 d ) and the oxygen (1 s ). It is due to the oxygen vacancies caused by reduction heat treatment process. Moreover there is ions redistribution of Nb +3 , Nb +4 and Nb +5 at the surface of the nanoparticles.