【摘要】 通过水热和热处理相结合的方法制备了具有核/壳结构的γ-Fe₂O₃/PZT和Pb Fe₁₂O₁₉/PZT磁电复合颗粒。选用Fe₃O₄纳米粒子作为磁性相核心,钙钛矿壳层的A位铅离子和B位锆、钛离子通过原位的水热反应形成致密包覆的非晶PZT层。经过650°C的热处理,PZT层开始结晶,同时Fe₃O₄核心转变成了γ-Fe₂O₃。经过750°C的热处理,壳层中的Pb向核心扩散形成了Pb Fe12O19相。两相具有良好的界面和有序取向生长特征。γ-Fe2O3-PZT和Pb Fe12O19-PZT的饱和磁化强度分别为18.47和17.79 A·m2/kg,其矫顽力分别为69.3×79.6和2552.7×79.6 A/m。更多还原

【Abstract】 Uniform ferrite/PZT core-shell nanoparticles were obtained via a combined hydrothermal and annealing process. A dense and well-crystallized PZT layer was formed by in-situ reaction between the A-site ion of lead and the B-site ions of zirconium and titanium on the Fe₃O₄ nanoparticles through the hydrothermal treatment and subsequent annealing process. The Fe₃O₄ core is transformed into γ-Fe₂O₃ when the nanoparticles are annealed at 650 °C. The PbFe₁₂O₁₉ phase forms when the nanoparticles are annealed at 750 °C. These core-shell nanostructures show well-defined interface and highly oriented growth. The saturation magnetization values for γ-Fe₂O₃/PZT and PbFe₁₂O₁₉ /PZT are 18.47 and 17.79 Am²·kg^-1, respectively. From γ-Fe₂O₃/PZT to Pb Fe12O19/PZT, the coercivity changes from 69.3×79.6 A/m to 2552.7×79.6 A/m.更多还原