Bi_(0.95)_(0.05)FeO_(3)nanocrystals are synthesized by a hydrothermal method,and are crystallized in a rhombohedrally distorted perovskite BiFeO_(3)structure in the R3c space,with compressive lattice distortion induce...Bi_(0.95)_(0.05)FeO_(3)nanocrystals are synthesized by a hydrothermal method,and are crystallized in a rhombohedrally distorted perovskite BiFeO_(3)structure in the R3c space,with compressive lattice distortion induced by the Y substitution at Bi sites from XRD study Compared with BiFeO_(3)gained under similar conditions,the magnetic properties are greatly enhanced,with saturate magnetization of 2.3emu/g at room temperature.Microwave dielectric properties of Bi0.95 Y0.05FeO_(3)nanocrystals are investigated in the range of 2-18 GHz.The Y substitution results in the increase of permeability and decrease of permittivity which are attributed to the enhanced spin relaxation of domain wall motion and the weakened electron-relaxation caused by decreasing Fe^(2+),respectively.The changes for microwave dielectric response could lead to the excellent microwave absorption due to the improvement of the impedance match between BiFeO_(3)and air.展开更多
基金Supported by the National Natural Science Foundation of under Grant No 50872159,and the Physics Development Fund of BUCT.
文摘Bi_(0.95)_(0.05)FeO_(3)nanocrystals are synthesized by a hydrothermal method,and are crystallized in a rhombohedrally distorted perovskite BiFeO_(3)structure in the R3c space,with compressive lattice distortion induced by the Y substitution at Bi sites from XRD study Compared with BiFeO_(3)gained under similar conditions,the magnetic properties are greatly enhanced,with saturate magnetization of 2.3emu/g at room temperature.Microwave dielectric properties of Bi0.95 Y0.05FeO_(3)nanocrystals are investigated in the range of 2-18 GHz.The Y substitution results in the increase of permeability and decrease of permittivity which are attributed to the enhanced spin relaxation of domain wall motion and the weakened electron-relaxation caused by decreasing Fe^(2+),respectively.The changes for microwave dielectric response could lead to the excellent microwave absorption due to the improvement of the impedance match between BiFeO_(3)and air.
