Lin Jinpei, Yang Xingxing, Su Kaimin, Yang Fang, He Yun, Lin Qing
College of Biomedical Information and Engineering, Hainan Medical University, Haikou 571199, China.
College of Physics and Technology, Guangxi Normal University, Guilin 541004, China.
Molecules. 2023 Aug 28;28(17):6280. doi: 10.3390/molecules28176280.
Magnetic Functional Nanomaterials CoZnREFeO (RE (rare-earth) = La,Sm,Gd) were prepared using the sol-gel combustion method. XRD characterization confirms that the ferrite samples we synthesized are single-phase cubic structures. The variation in the average crystalline size and lattice parameter is related to RE ion doping. The Mössbauer spectra of CoREFeO are two sets of magnetic six-wire peaks that indicate the ferrimagnetic behavior of the sample. The calcination temperature greatly influences the absorption area of Mössbauer for CoFeO, indicating that the calcination temperature affects the iron ion content at the octahedral B and tetrahedral A sites. Additionally, scanning electron microscopy measurements of the substituted specimens reveal that the ferrite powders are nanoparticles. With an increase in RE ions, the coercivity increases, and the saturation magnetization changes obviously. The XRD characterization of CoZnLaFeO shows that the main crystalline phase of the sample is the cubic spinel structure phase, and there are fewer secondary crystalline phases. The lattice parameter tends to decrease with the substitution of La ions. The average grain size decreased significantly with the increase in La content. From ferrimagnetic state transition to relaxation behavior, the hyperfine magnetic field decreases in La concentration by room temperature Mössbauer spectra. With the substitution of La ions, both the saturation magnetization and coercivity of the samples were reduced, and the coercivity of all samples was lower.
采用溶胶-凝胶燃烧法制备了磁性功能纳米材料CoZnREFeO（RE（稀土）=La、Sm、Gd）。XRD表征证实我们合成的铁氧体样品为单相立方结构。平均晶体尺寸和晶格参数的变化与稀土离子掺杂有关。CoREFeO的穆斯堡尔谱是两组磁性六线峰，表明样品具有亚铁磁性行为。煅烧温度对CoFeO的穆斯堡尔吸收面积有很大影响，表明煅烧温度影响八面体B位和四面体A位的铁离子含量。此外，对替代样品的扫描电子显微镜测量表明，铁氧体粉末为纳米颗粒。随着稀土离子的增加，矫顽力增加，饱和磁化强度明显变化。CoZnLaFeO的XRD表征表明，样品的主要晶相为立方尖晶石结构相，次生晶相较少。随着La离子的替代，晶格参数趋于减小。随着La含量的增加，平均晶粒尺寸显著减小。通过室温穆斯堡尔谱，从亚铁磁态转变为弛豫行为，超精细磁场随La浓度降低。随着La离子的替代，样品的饱和磁化强度和矫顽力均降低，且所有样品的矫顽力均较低。
