TÍNH CHẤT ĐIỆN VÀ TỪ CỦA HỆ VẬT LIỆU MULTIFERROIC NANOCOMPOSITE xLa1,5Sr0,5NiO4/(1-x)BaTiO3

Abstract

In this work, some electrical and magnetic properties of multiferroic xLa1.5Sr0.5NiO4/(1- x)BaTiO3 nanocomposites prepared by the reactive milling and the heat treatment methods have been invsetigated. XRD patterns show an independent coexistence of two nanocrystalline phases in the samples, where La1.5Sr0.5NiO4 phase belongs to the tetragonal structure and BaTiO3 phase belongs to the cubic one. The average crystal size is determined to be about 15 and 35 nm for La1.5Sr0.5NiO4 and BaTiO3 phases, respectively. The lattice parameters corresponsing to these phases are almost unchanged, indicating that there is no diffusion or chemical reaction between La1.5Sr0.5NiO4 and BaTiO3. Doping La1.5Sr0.5NiO4 into BaTiO3-based has significantly improved the ferroelectric and ferromagnetic properties, contributing to an enhancement of the electrical polarization of material. Electromagnetic interactions in multiferroic xLa1.5Sr0.5NiO4/(1- x)BaTiO3 nanocomposites will be discussed through experimental P(E) and M(H) data.
Keywords: Multiferroic, electromagnetic interactions, La1.5Sr0.5NiO4/BaTiO3, nanocomposite.