We report change in the structural and the magnetic properties of a gamma-irradiated sample of CoBi_0.1Fe_1.9O₄ nanoparticles synthesized using the co-precipitation method. All samples were exposed to low doses of γ-radiation (i.e., 0, 100, 200, 400, and 800 Gy). The X-ray diffraction (XRD) evaluations indicated that all samples had a single-phase cubic spinel structure in space group Fd3m. The crystal size, lattice parameter, and other structural parameters of the irradiated CoBi_xFe_2-xO₄ nanoparticles were calculated based on the XRD data. The crystallite size is found to increase with increasing radiation dose. The stretching vibration modes of the absorption bands (v₁ and v₂) were observed in the Fourier transform infrared (FTIR) spectrum, thereby reconfirming that the metal oxide is realized a cobalt ferrite-based material. The change in the surface morphology was measured using scanning electron microscopy (SEM). Finally, the modified magnetic parameters (H_c, M_s, M_r) of the gamma-irradiated samples were determined from the M–H loop recorded at room temperature.

我们报告了使用共沉淀法合成的 CoBi _0.1 Fe _1.9 O ₄纳米颗粒的 γ 辐照样品的结构和磁性能的变化。所有样品均暴露于低剂量的 γ 辐射（即 0、100、200、400 和 800 Gy）。X 射线衍射 (XRD) 评估表明，所有样品均具有 Fd3m 空间群中的单相立方尖晶石结构。基于XRD数据计算被照射的CoBi _x Fe _2-x O ₄纳米颗粒的晶体尺寸、晶格参数和其他结构参数。发现晶粒尺寸随着辐射剂量的增加而增加。吸收带的伸缩振动模式 ( v在傅里叶变换红外 (FTIR) 光谱中观察到图₁和v ₂ )，从而再次确认金属氧化物是实现了钴铁氧体基材料。使用扫描电子显微镜（SEM）测量表面形态的变化。最后，从室温下记录的 M-H 环确定伽马辐照样品的修正磁参数（H _c、M _s、M _r）。