title: Hydrothermal synthesis and properties of NiFe2O4@BaTiO3composites with well-matched interface.
abstract: NiFe2O4@BaTiO3multiferroic composite particles were produced by a simple hydrothermal method in two steps: preparing NiFe2O4nanoparticles and then synthesizing core-shell nanocomposites. Multiferroic composite ceramics were sintered from these powders. X-ray diffraction, Raman scattering and energy dispersive x-ray analyses indicated that the core-shell composites with a NiFe2O4core and BaTiO3shell were formed in the hydrothermal environment. Different types of sharp interfaces were self-assembled owing to the minimization of direct elastic energy. The saturation magnetization of the composites linearly increased with the NiFe2O4content while the dielectric constant decreased. A dielectric peak appeared at around 460 °C because of the oxygen vacancies in the BaTiO3ceramics. It resulted in an enhancement of magnetic permeability in the composites, indicating magnetoelectric coupling that was also observed by direct magnetoelectric measurements.
authors.affiliation: College of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, People's Republic of China.
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Zhou
authors.affiliation: College of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, People's Republic of China.
authors.forename: Li
authors.initials: L
authors.lastname: Lv
authors.affiliation: College of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, People's Republic of China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Liu
authors.affiliation: College of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, People's Republic of China.
authors.forename: Yu-Xiang
authors.initials: YX
authors.lastname: Zhang
authors.affiliation: College of Physics and Information Technology, Shaanxi Normal University, Xi'an, 710062, People's Republic of China.
authors.forename: Peng
authors.initials: P
authors.lastname: Liu
keywords: crystal growth; dielectrics; hydrothermal method; interface; magnetic properties; nanocomposite